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Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Deferred income tax assets:    
Provisions not currently deductible for tax purposes $ 366us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther $ 315us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Tax losses/benefit carryforwards, net 627nvl_DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards 493nvl_DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards
Depreciation and amortization 38nvl_DeferredTaxAssetsPropertyPlantAndEquipmentAndIntangibles 46nvl_DeferredTaxAssetsPropertyPlantAndEquipmentAndIntangibles
Other assets 4us-gaap_DeferredTaxAssetsOther 8us-gaap_DeferredTaxAssetsOther
Total deferred income tax assets 1,035us-gaap_DeferredTaxAssetsGross 862us-gaap_DeferredTaxAssetsGross
Less: valuation allowance (528)us-gaap_DeferredTaxAssetsValuationAllowance (426)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred income tax assets 507us-gaap_DeferredTaxAssetsNet 436us-gaap_DeferredTaxAssetsNet
Deferred income tax liabilities:    
Depreciation and amortization 477nvl_DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndIntangibles 529nvl_DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndIntangibles
Inventory valuation reserves 102us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts 87us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts
Monetary exchange gains, net 9nvl_DeferredTaxLiabilitiesMonetaryExchangeGainsNet 46nvl_DeferredTaxLiabilitiesMonetaryExchangeGainsNet
Other liabilities 26us-gaap_DeferredTaxLiabilitiesOther 34us-gaap_DeferredTaxLiabilitiesOther
Total deferred income tax liabilities 614us-gaap_DeferredIncomeTaxLiabilities 696us-gaap_DeferredIncomeTaxLiabilities
Net deferred income tax liabilities $ 107us-gaap_DeferredTaxLiabilities $ 260us-gaap_DeferredTaxLiabilities