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Other Expense (Income) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting Information [Line Items]                      
Gain from insurance settlement     $ 13nvl_GainLossfromInsuranceSettlement                
Foreign currency remeasurement losses (gains), net                 27us-gaap_ForeignCurrencyTransactionGainLossRealized (7)us-gaap_ForeignCurrencyTransactionGainLossRealized (10)us-gaap_ForeignCurrencyTransactionGainLossRealized
Loss (gain) on change in fair value of other unrealized derivative instruments, net                 0us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 10us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 (14)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
Loss (gain) on change in fair value of other realized derivative instruments, net                 2nvl_GainLossOnChangeInFairValueOfOtherRealizedDerivativeInstrumentsNet (62)nvl_GainLossOnChangeInFairValueOfOtherRealizedDerivativeInstrumentsNet (28)nvl_GainLossOnChangeInFairValueOfOtherRealizedDerivativeInstrumentsNet
Loss on sale of assets, net                 5us-gaap_GainLossOnSaleOfPropertyPlantEquipment 9us-gaap_GainLossOnSaleOfPropertyPlantEquipment 6us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Loss on Brazilian tax litigation, net                 7us-gaap_GainLossRelatedToLitigationSettlement 6us-gaap_GainLossRelatedToLitigationSettlement 8us-gaap_GainLossRelatedToLitigationSettlement
Interest income                 (7)us-gaap_InterestIncomeExpenseNonoperatingNet (6)us-gaap_InterestIncomeExpenseNonoperatingNet (5)us-gaap_InterestIncomeExpenseNonoperatingNet
Gain on business interruption insurance recovery, net                 (19)us-gaap_GainOnBusinessInterruptionInsuranceRecovery 0us-gaap_GainOnBusinessInterruptionInsuranceRecovery (11)us-gaap_GainOnBusinessInterruptionInsuranceRecovery
Other, net                 2us-gaap_OtherNonoperatingExpense 9us-gaap_OtherNonoperatingExpense 2us-gaap_OtherNonoperatingExpense
Other expense (income), net 3us-gaap_OtherNonoperatingIncomeExpense (9)us-gaap_OtherNonoperatingIncomeExpense 18us-gaap_OtherNonoperatingIncomeExpense 5us-gaap_OtherNonoperatingIncomeExpense (14)us-gaap_OtherNonoperatingIncomeExpense (12)us-gaap_OtherNonoperatingIncomeExpense (5)us-gaap_OtherNonoperatingIncomeExpense (10)us-gaap_OtherNonoperatingIncomeExpense 17us-gaap_OtherNonoperatingIncomeExpense (41)us-gaap_OtherNonoperatingIncomeExpense (52)us-gaap_OtherNonoperatingIncomeExpense
Europe [Member]                      
Segment Reporting Information [Line Items]                      
Gain from insurance settlement     $ 6nvl_GainLossfromInsuranceSettlement
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_EuropeMember