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Fair Values and Effect of Derivative Instruments on Consolidated Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified
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Mar. 31, 2015
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Dec. 31, 2014
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| Derivatives, Fair Value [Line Items] |
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| Gross amount of recognized assets |
$ 19us-gaap_DerivativeFairValueOfDerivativeAsset |
$ 12us-gaap_DerivativeFairValueOfDerivativeAsset |
| Gross amount offset in the consolidated balance sheet |
(5)us-gaap_DerivativeAssetFairValueGrossLiability |
(4)us-gaap_DerivativeAssetFairValueGrossLiability |
| Net amount of assets presented in the consolidated balance sheet |
14us-gaap_DerivativeAssets |
8us-gaap_DerivativeAssets |
| Gross amount of recognized (liabilities) |
(11)us-gaap_DerivativeFairValueOfDerivativeLiability |
(6)us-gaap_DerivativeFairValueOfDerivativeLiability |
| Gross amount offset in the consolidated balance sheet |
6us-gaap_DerivativeLiabilityFairValueGrossAsset |
2us-gaap_DerivativeLiabilityFairValueGrossAsset |
| Net amount of (liabilities) presented in the consolidated balance sheet |
(5)us-gaap_DerivativeLiabilities |
(4)us-gaap_DerivativeLiabilities |
| Total derivatives |
9us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet |
4us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet |
| Derivatives designated as hedges | Foreign Currency Hedges | Other current assets |
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| Derivatives, Fair Value [Line Items] |
|
|
| Gross amount of recognized assets |
17us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
9us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
| Gross amount offset in the consolidated balance sheet |
0us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
0us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
| Net amount of assets presented in the consolidated balance sheet |
17us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
9us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
| Derivatives designated as hedges | Foreign Currency Hedges | Accounts payable |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Gross amount of recognized (liabilities) |
0us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
0us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
| Gross amount offset in the consolidated balance sheet |
3us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
2us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
| Net amount of (liabilities) presented in the consolidated balance sheet |
3us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
2us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
| Derivatives designated as hedges | Natural gas hedges | Other current assets |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Gross amount of recognized assets |
0us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
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| Gross amount offset in the consolidated balance sheet |
(4)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
(2)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
| Net amount of assets presented in the consolidated balance sheet |
(4)us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
(2)us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
| Derivatives designated as hedges | Natural gas hedges | Accounts payable |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Gross amount of recognized (liabilities) |
(4)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
(5)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
| Gross amount offset in the consolidated balance sheet |
0us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
0us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
| Net amount of (liabilities) presented in the consolidated balance sheet |
(4)us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
(5)us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AccountsPayableMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
| Derivatives designated as hedges | Natural gas hedges | Other long-term obligations |
|
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| Derivatives, Fair Value [Line Items] |
|
|
| Gross amount of recognized (liabilities) |
(1)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_FairValueByLiabilityClassAxis = mwv_NonCurrentLiabilitiesOtherMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
(1)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_FairValueByLiabilityClassAxis = mwv_NonCurrentLiabilitiesOtherMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
| Gross amount offset in the consolidated balance sheet |
0us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_FairValueByLiabilityClassAxis = mwv_NonCurrentLiabilitiesOtherMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
0us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_FairValueByLiabilityClassAxis = mwv_NonCurrentLiabilitiesOtherMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
| Net amount of (liabilities) presented in the consolidated balance sheet |
(1)us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_FairValueByLiabilityClassAxis = mwv_NonCurrentLiabilitiesOtherMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
(1)us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_FairValueByLiabilityClassAxis = mwv_NonCurrentLiabilitiesOtherMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
| Derivatives not designated as hedges | Foreign Currency Hedges |
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|
| Derivatives, Fair Value [Line Items] |
|
|
| Gross amount of recognized (liabilities) |
(6)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
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| Gross amount offset in the consolidated balance sheet |
3us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
|
| Net amount of (liabilities) presented in the consolidated balance sheet |
(3)us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
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| Derivatives not designated as hedges | Foreign Currency Hedges | Other current assets |
|
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| Derivatives, Fair Value [Line Items] |
|
|
| Gross amount of recognized assets |
2us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
3us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
| Gross amount offset in the consolidated balance sheet |
(1)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
(2)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
| Net amount of assets presented in the consolidated balance sheet |
$ 1us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
$ 1us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |