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衍生工具及套期保值活动（说明）（详情）（美元）
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12个月结束 |
9月结束 |
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2014年12月31日
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2013年12月31日
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2012年12月31日
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2013年9月30日
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| 衍生品〔单行项目〕 |
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| 本财政年度结束日期 |
——12-31 |
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| 衍生工具，在其他综合收益（损失）中确认的收益（损失），有效部分，净额 |
美元(28200000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet |
美元(51700000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet |
25600000美元us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet |
|
| 衍生工具，收益（损失）从累积OCI重新分类为收益，有效部分，净额 |
(31000000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet |
(22100000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet |
18100000年us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet |
|
| 未指定为套期工具的衍生工具，收益（损失），净额 |
159100000年us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet |
141400000年us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet |
163200000年us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet |
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| 应收帐款净额 |
205600000年us-gaap_AccountsReceivableNetCurrent |
270000000年us-gaap_AccountsReceivableNetCurrent |
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| 指定前的加元外汇合约对冲[成员] |
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| 衍生品〔单行项目〕 |
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| 衍生工具，在其他综合收益（损失）中确认的收益（损失），有效部分，净额 |
(14300000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_CanadianDollarForeignExchangeContractsHedgePriortoDeDesignationMember |
(4100000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_CanadianDollarForeignExchangeContractsHedgePriortoDeDesignationMember |
0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_CanadianDollarForeignExchangeContractsHedgePriortoDeDesignationMember |
|
| 指定前的加元外汇合约套期保值[成员]|销售成本[成员] |
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| 衍生品〔单行项目〕 |
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| 衍生工具，收益（损失）从累积OCI重新分类为收益，有效部分，净额 |
(17700000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_CanadianDollarForeignExchangeContractsHedgePriortoDeDesignationMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember |
(1900000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_CanadianDollarForeignExchangeContractsHedgePriortoDeDesignationMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember |
0us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_CanadianDollarForeignExchangeContractsHedgePriortoDeDesignationMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember |
|
| 指定对冲工具[成员][成员]b|未指定为对冲工具[成员] |
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| 衍生品〔单行项目〕 |
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| 衍生品，名义金额 |
0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_CanadianDollarForeignExchangeContractsHedgeDeDesignatedMemberMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember |
|
|
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| 加拿大元外汇合约对冲指定[成员][成员]|未指定为对冲工具[成员]|其他累积综合收益（损失）[成员] |
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| 衍生品〔单行项目〕 |
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| 相关合同结算后，将在未来12个月内重新分类为产品收入的金额 |
0us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_CanadianDollarForeignExchangeContractsHedgeDeDesignatedMemberMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember |
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| 外汇合同[成员]b|销售成本[成员] |
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| 衍生品〔单行项目〕 |
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| 未指定为套期工具的衍生工具，收益（损失），净额 |
(16900000)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember |
|
0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember |
|
| 澳元外汇合约套期保值指定[成员] |
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| 衍生品〔单行项目〕 |
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| 衍生工具，在其他综合收益（损失）中确认的收益（损失），有效部分，净额 |
(13900000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_AustralianDollarForeignExchangeContractHedgeDesignationMember |
(34700000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_AustralianDollarForeignExchangeContractHedgeDesignationMember |
20200000年us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_AustralianDollarForeignExchangeContractHedgeDesignationMember |
|
| 澳元外汇合约套期保值指定【会员】|产品收益【会员】 |
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| 衍生品〔单行项目〕 |
|
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| 衍生工具，收益（损失）从累积OCI重新分类为收益，有效部分，净额 |
(13200000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_AustralianDollarForeignExchangeContractHedgeDesignationMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesRevenueGoodsNetMember |
(11900000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_AustralianDollarForeignExchangeContractHedgeDesignationMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesRevenueGoodsNetMember |
14800000年us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_AustralianDollarForeignExchangeContractHedgeDesignationMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesRevenueGoodsNetMember |
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| 澳洲元外汇合约指定套期保值工具〔成员〕 |
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| 衍生品〔单行项目〕 |
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| 衍生品，名义金额 |
220000000年invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_AustralianDollarForeignExchangeContractHedgeDesignationMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember |
323000000年invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_AustralianDollarForeignExchangeContractHedgeDesignationMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember |
|
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| 澳元外汇合约套期保值指定[成员]|指定为套期保值工具[成员]|其他累积综合收益（损失）[成员] |
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| 衍生品〔单行项目〕 |
|
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|
| 相关合同结算后，将在未来12个月内重新分类为产品收入的金额 |
(15100000)us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months
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= us-gaap_AccumulatedOtherComprehensiveIncomeMember
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= clf_AustralianDollarForeignExchangeContractHedgeDesignationMember
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= us-gaap_DesignatedAsHedgingInstrumentMember |
|
|
|
| 加元外汇合约对冲指定[成员] |
|
|
|
|
| 衍生品〔单行项目〕 |
|
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|
|
| 衍生工具，在其他综合收益（损失）中确认的收益（损失），有效部分，净额 |
0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
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= clf_CanadianDollarForeignExchangeContractsHedgeDesignationMember |
(12900000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_CanadianDollarForeignExchangeContractsHedgeDesignationMember |
6700000年us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_CanadianDollarForeignExchangeContractsHedgeDesignationMember |
|
| 加拿大元外汇合约套期保值指定【会员】|销售成本【会员】 |
|
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|
|
| 衍生品〔单行项目〕 |
|
|
|
|
| 衍生工具，收益（损失）从累积OCI重新分类为收益，有效部分，净额 |
0us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
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= clf_CanadianDollarForeignExchangeContractsHedgeDesignationMember
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= us-gaap_CostOfSalesMember |
(8200000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
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= us-gaap_CostOfSalesMember |
3300000年us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_CanadianDollarForeignExchangeContractsHedgeDesignationMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember |
|
| 加拿大元外汇合约指定套期保值工具[成员]|指定套期保值工具[成员] |
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| 衍生品〔单行项目〕 |
|
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|
|
| 衍生品，名义金额 |
0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_CanadianDollarForeignExchangeContractsHedgeDesignationMember
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= us-gaap_DesignatedAsHedgingInstrumentMember |
285900000年invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= clf_CanadianDollarForeignExchangeContractsHedgeDesignationMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember |
|
|
| 利率掉期〔成员〕b|其他营业外收入（费用）〔成员〕 |
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| 衍生品〔单行项目〕 |
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| 公允价值套期无效损益，净额 |
300000年us-gaap_GainLossOnFairValueHedgeIneffectivenessNet
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= us-gaap_OtherNonoperatingIncomeExpenseMember |
|
|
100000年us-gaap_GainLossOnFairValueHedgeIneffectivenessNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherNonoperatingIncomeExpenseMember |
| 利率掉期〔成员〕b|指定为套期保值工具〔成员〕 |
|
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|
|
| 衍生品〔单行项目〕 |
|
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|
|
| 衍生品，名义金额 |
250000000年invest_DerivativeNotionalAmount
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|
|
|
| 库库锁〔成员〕 |
|
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| 衍生品〔单行项目〕 |
|
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| 衍生工具，在其他综合收益（损失）中确认的收益（损失），有效部分，净额 |
|
|
(1300000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_TreasuryLockMember |
|
| 库务锁[成员]|其他营业外收入（费用）[成员] |
|
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|
|
| 衍生品〔单行项目〕 |
|
|
|
|
| 衍生工具，收益（损失）从累积OCI重新分类为收益，有效部分，净额 |
(100000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_TreasuryLockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherNonoperatingIncomeExpenseMember |
(100000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
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/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherNonoperatingIncomeExpenseMember |
0us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_TreasuryLockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherNonoperatingIncomeExpenseMember |
|
| 未指定为套期工具的衍生工具，收益（损失），净额 |
0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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(400000)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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|
| 现金流量套期收益（损失）应在12个月内重新分类 |
(100000)us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
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|
|
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| 国库锁[成员]|指定为套期保值工具[成员] |
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| 衍生品〔单行项目〕 |
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| 衍生品，名义金额 |
|
|
200000000年invest_DerivativeNotionalAmount
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|
| 国库锁[成员]|指定对冲工具[成员]|累计其他综合收益（损失）[成员] |
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| 衍生品〔单行项目〕 |
|
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|
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| 衍生工具，在其他综合收益（损失）中确认的收益（损失），有效部分，净额 |
|
(1300000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
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= us-gaap_DesignatedAsHedgingInstrumentMember |
|
|
| 客户供应协议[成员]|未指定为套期保值工具[成员]|产品收入[成员] |
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| 衍生品〔单行项目〕 |
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| 在衍生工具收益中确认的利得/（损失）金额 |
187800000年us-gaap_DerivativeGainLossOnDerivativeNet
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149200000年us-gaap_DerivativeGainLossOnDerivativeNet
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171400000年us-gaap_DerivativeGainLossOnDerivativeNet
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= us-gaap_NondesignatedMember
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|
| 客户供应协议[成员]|未指定为套期保值工具[成员]|其他流动资产[成员] |
|
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|
|
| 衍生品〔单行项目〕 |
|
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|
|
| 衍生品资产 |
63200000年us-gaap_DerivativeAssetsCurrent
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55800000年us-gaap_DerivativeAssetsCurrent
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|
|
| 临时定价安排[成员]|产品收入[成员] |
|
|
|
|
| 衍生品〔单行项目〕 |
|
|
|
|
| 未指定为套期工具的衍生工具，收益（损失），净额 |
(11800000)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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(7800000)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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|
| 临时定价安排[成员]b|未指定为套期保值工具[成员]|皇冠体育官网铁矿石、加拿大东部铁矿石及亚太地区铁矿石[成员]|产品收入[成员] |
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|
| 衍生品〔单行项目〕 |
|
|
|
|
| 在衍生工具收益中确认的利得/（损失）金额 |
(11800000)us-gaap_DerivativeGainLossOnDerivativeNet
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|
|
| 临时定价安排[成员]b|未指定为套期保值工具[成员]|皇冠体育官网铁矿石、加拿大东部铁矿石及亚太地区铁矿石[成员]|其他流动资产[成员] |
|
|
|
|
| 衍生品〔单行项目〕 |
|
|
|
|
| 衍生品资产 |
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3100000年us-gaap_DerivativeAssetsCurrent
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| 临时定价安排[成员]b|未指定为套期保值工具[成员]|皇冠体育官网铁矿石、加拿大东部铁矿石及亚太地区铁矿石[成员]|其他流动负债[成员] |
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| 衍生品〔单行项目〕 |
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| 导数的负债 |
11800000年us-gaap_DerivativeLiabilitiesCurrent
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10300000年us-gaap_DerivativeLiabilitiesCurrent
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| 临时定价安排[成员]|未被指定为套期保值工具[成员]|皇冠体育官网铁矿石及加拿大东部铁矿石[成员]|产品收入[成员] |
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| 衍生品〔单行项目〕 |
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| 在衍生工具收益中确认的利得/（损失）金额 |
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(7800000)us-gaap_DerivativeGainLossOnDerivativeNet
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| $5亿3.95% 2018优先票据[成员] |
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| 衍生品〔单行项目〕 |
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| 债务工具，票面金额 |
500000000年us-gaap_DebtInstrumentFaceAmount
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500000000 .0us-gaap_DebtInstrumentFaceAmount
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| Bloom Lake[成员]|加拿大元外汇合约在指定前对冲[成员] |
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| 衍生品〔单行项目〕 |
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| 衍生工具，收益（损失）从累积OCI重新分类为收益，有效部分，净额 |
(9900000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
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| b|未指定对冲工具b|未指定对冲工具b|未指定对冲工具b|[成员]b| |
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| 衍生品〔单行项目〕 |
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| 衍生品，名义金额 |
183000000年invest_DerivativeNotionalAmount
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| Bloom Lake【会员】|加元外汇合约套期保值指定【会员】【会员】|未指定为套期保值工具【会员】|累计其他综合收益（损失）【会员】 |
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| 衍生品〔单行项目〕 |
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| 相关合同结算后，将在未来12个月内重新分类为产品收入的金额 |
0us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months
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| Bloom Lake[会员]|外汇合约[会员]|销售成本[会员] |
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| 衍生品〔单行项目〕 |
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| 未指定为套期工具的衍生工具，收益（损失），净额 |
(7300000)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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| Wabush和Cliffs铬铁矿安大略和Cliffs铬铁矿远北地区[成员]b|指定前的加元外汇合约对冲[成员] |
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| 衍生品〔单行项目〕 |
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| 衍生工具，收益（损失）从累积OCI重新分类为收益，有效部分，净额 |
(500000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
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| Wabush和Cliffs铬铁矿安大略和Cliffs铬铁矿远北[成员]|加拿大元外汇合约对冲指定[成员][成员]|未指定为对冲工具[成员] |
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| 衍生品〔单行项目〕 |
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| 衍生品，名义金额 |
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74800000年invest_DerivativeNotionalAmount
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| Wabush and Cliffs铬铁矿安大略和Cliffs铬铁矿远北[成员]|加元外汇合约对冲指定[成员][成员]|未指定为对冲工具[成员]|累计其他综合收益（损失）[成员] |
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| 衍生品〔单行项目〕 |
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| 相关合同结算后，将在未来12个月内重新分类为产品收入的金额 |
0us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months
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| 沃布什和悬崖铬铁矿安大略和悬崖铬铁矿远北[成员]|外汇合同[成员]|销售成本[成员] |
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| 衍生品〔单行项目〕 |
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| 未指定为套期工具的衍生工具，收益（损失），净额 |
3300000年us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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(600000)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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| Wabush[成员]b|指定前的加元外汇合约对冲[成员] |
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| 衍生品〔单行项目〕 |
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| 衍生工具，收益（损失）从累积OCI重新分类为收益，有效部分，净额 |
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美元(1900000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
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