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Financial Instruments and Commodity Contracts (Gain (Loss) Reclassification) (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
Derivative Instruments, Gain (Loss) [Line Items]                      
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
Cost of goods sold (2,483)us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization (2,498)us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization (2,483)us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization (2,329)us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization (2,203)us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization (2,093)us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization (2,074)us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization (2,098)us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization (9,793)us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization (8,468)us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization (8,477)us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization
Net sales 2,789us-gaap_SalesRevenueGoodsNet 2,847us-gaap_SalesRevenueGoodsNet 2,831us-gaap_SalesRevenueGoodsNet 2,680us-gaap_SalesRevenueGoodsNet 2,549us-gaap_SalesRevenueGoodsNet 2,403us-gaap_SalesRevenueGoodsNet 2,414us-gaap_SalesRevenueGoodsNet 2,401us-gaap_SalesRevenueGoodsNet 11,147us-gaap_SalesRevenueGoodsNet 9,767us-gaap_SalesRevenueGoodsNet 9,812us-gaap_SalesRevenueGoodsNet
SG&A (108)us-gaap_SellingGeneralAndAdministrativeExpense (108)us-gaap_SellingGeneralAndAdministrativeExpense (103)us-gaap_SellingGeneralAndAdministrativeExpense (108)us-gaap_SellingGeneralAndAdministrativeExpense (117)us-gaap_SellingGeneralAndAdministrativeExpense (115)us-gaap_SellingGeneralAndAdministrativeExpense (109)us-gaap_SellingGeneralAndAdministrativeExpense (120)us-gaap_SellingGeneralAndAdministrativeExpense (427)us-gaap_SellingGeneralAndAdministrativeExpense (461)us-gaap_SellingGeneralAndAdministrativeExpense (398)us-gaap_SellingGeneralAndAdministrativeExpense
Depreciation and amortization (86)us-gaap_DepreciationDepletionAndAmortization (87)us-gaap_DepreciationDepletionAndAmortization (90)us-gaap_DepreciationDepletionAndAmortization (89)us-gaap_DepreciationDepletionAndAmortization (87)us-gaap_DepreciationDepletionAndAmortization (91)us-gaap_DepreciationDepletionAndAmortization (79)us-gaap_DepreciationDepletionAndAmortization (77)us-gaap_DepreciationDepletionAndAmortization (352)us-gaap_DepreciationDepletionAndAmortization (334)us-gaap_DepreciationDepletionAndAmortization (292)us-gaap_DepreciationDepletionAndAmortization
Income before income taxes                 162us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 115us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 286us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax provision (benefit) 11us-gaap_IncomeTaxExpenseBenefit (3)us-gaap_IncomeTaxExpenseBenefit 2us-gaap_IncomeTaxExpenseBenefit (24)us-gaap_IncomeTaxExpenseBenefit 15us-gaap_IncomeTaxExpenseBenefit 3us-gaap_IncomeTaxExpenseBenefit (26)us-gaap_IncomeTaxExpenseBenefit (3)us-gaap_IncomeTaxExpenseBenefit (14)us-gaap_IncomeTaxExpenseBenefit (11)us-gaap_IncomeTaxExpenseBenefit (83)us-gaap_IncomeTaxExpenseBenefit
Net income 29us-gaap_ProfitLoss 46us-gaap_ProfitLoss 38us-gaap_ProfitLoss 35us-gaap_ProfitLoss 54us-gaap_ProfitLoss 13us-gaap_ProfitLoss 23us-gaap_ProfitLoss 14us-gaap_ProfitLoss 148us-gaap_ProfitLoss 104us-gaap_ProfitLoss 203us-gaap_ProfitLoss
Cash Flow Hedging [Member]                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Income before income taxes                 (39)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
41us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
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8us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
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Income tax provision (benefit)                 8us-gaap_IncomeTaxExpenseBenefit
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(16)us-gaap_IncomeTaxExpenseBenefit
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(2)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
Net income                 (31)us-gaap_ProfitLoss
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
25us-gaap_ProfitLoss
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6us-gaap_ProfitLoss
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
Cash Flow Hedging [Member] | Energy Contracts [Member] | Other Expense (Income), Net                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Other expense (income), net                 (5)us-gaap_OtherNonoperatingIncomeExpense
/ us-gaap_DerivativeInstrumentRiskAxis
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(5)us-gaap_OtherNonoperatingIncomeExpense
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(5)us-gaap_OtherNonoperatingIncomeExpense
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/ us-gaap_IncomeStatementLocationAxis
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Cash Flow Hedging [Member] | Aluminium Contracts [Member] | Cost of Goods Sold [Member]                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Cost of goods sold                 (40)us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization
/ us-gaap_DerivativeInstrumentRiskAxis
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53us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization
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19us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization
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/ us-gaap_IncomeStatementLocationAxis
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Cash Flow Hedging [Member] | Aluminium Contracts [Member] | Net Sales [Member]                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Net sales                 0us-gaap_SalesRevenueGoodsNet
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7us-gaap_SalesRevenueGoodsNet
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12us-gaap_SalesRevenueGoodsNet
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/ us-gaap_IncomeStatementLocationAxis
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Cash Flow Hedging [Member] | Currency Exchange Contracts [Member] | Other Expense (Income), Net                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Other expense (income), net                 (3)us-gaap_OtherNonoperatingIncomeExpense
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(2)us-gaap_OtherNonoperatingIncomeExpense
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(1)us-gaap_OtherNonoperatingIncomeExpense
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Cash Flow Hedging [Member] | Currency Exchange Contracts [Member] | Cost of Goods Sold [Member]                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Cost of goods sold                 (14)us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization
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(14)us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization
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(15)us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization
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/ us-gaap_IncomeStatementLocationAxis
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Cash Flow Hedging [Member] | Currency Exchange Contracts [Member] | Net Sales [Member]                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Net sales                 18us-gaap_SalesRevenueGoodsNet
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Cash Flow Hedging [Member] | Currency Exchange Contracts [Member] | SG&A [Member]                      
Derivative Instruments, Gain (Loss) [Line Items]                      
SG&A                 (1)us-gaap_SellingGeneralAndAdministrativeExpense
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(1)us-gaap_SellingGeneralAndAdministrativeExpense
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(2)us-gaap_SellingGeneralAndAdministrativeExpense
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Cash Flow Hedging [Member] | Currency Exchange Contracts [Member] | Gain on Assets Held-for-sale, Net [Member]                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Gain on assets held for sale, net                 7nvl_GainLossonAssetsHeldforsale
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0nvl_GainLossonAssetsHeldforsale
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Cash Flow Hedging [Member] | Currency Exchange Contracts [Member] | Depreciation and Amortization [Member]                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Depreciation and amortization                 $ (1)us-gaap_DepreciationDepletionAndAmortization
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$ 0us-gaap_DepreciationDepletionAndAmortization
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$ 0us-gaap_DepreciationDepletionAndAmortization
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