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Commitments and Contingencies (Details Textual) (USD $)
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Loss Contingencies [Line Items]      
Estimated range of loss, minimum $ 0us-gaap_LossContingencyRangeOfPossibleLossMinimum    
Estimated range of loss, maximum 60,000,000us-gaap_LossContingencyRangeOfPossibleLossMaximum    
Liability related to repurchase obligation        
Accrual for Environmental Loss Contingencies [Abstract]      
Accrual for environmental loss contingencies, noncurrent 22,000,000us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent    
Accrual for environmental loss contingencies 4,000,000us-gaap_AccrualForEnvironmentalLossContingencies    
Loss Contingency Accrual [Abstract]      
Settlement agreement, term 180 months    
Loss on Brazilian tax litigation, net 7,000,000us-gaap_GainLossRelatedToLitigationSettlement 6,000,000us-gaap_GainLossRelatedToLitigationSettlement 8,000,000us-gaap_GainLossRelatedToLitigationSettlement
Obligation to Repurchase Inventories Sold [Member]      
Loss Contingencies [Line Items]      
Outstanding repurchase obligations 206,000,000us-gaap_OtherCommitment
/ us-gaap_OtherCommitmentsAxis
= nvl_ObligationtoRepurchaseInventoriesSoldMember
74,000,000us-gaap_OtherCommitment
/ us-gaap_OtherCommitmentsAxis
= nvl_ObligationtoRepurchaseInventoriesSoldMember
 
Liability related to repurchase obligation 0us-gaap_CommitmentsAndContingencies
/ us-gaap_OtherCommitmentsAxis
= nvl_ObligationtoRepurchaseInventoriesSoldMember
0us-gaap_CommitmentsAndContingencies
/ us-gaap_OtherCommitmentsAxis
= nvl_ObligationtoRepurchaseInventoriesSoldMember
 
Accrued Expenses and Other Current Liabilities [Member]      
Accrual for Environmental Loss Contingencies [Abstract]      
Accrual for environmental loss contingencies, current 4,000,000us-gaap_AccruedEnvironmentalLossContingenciesCurrent
/ us-gaap_BalanceSheetLocationAxis
= nvl_AccruedExpensesAndOtherCurrentLiabilitiesMember
3,000,000us-gaap_AccruedEnvironmentalLossContingenciesCurrent
/ us-gaap_BalanceSheetLocationAxis
= nvl_AccruedExpensesAndOtherCurrentLiabilitiesMember
 
Other Long-term Liabilities [Member]      
Accrual for Environmental Loss Contingencies [Abstract]      
Accrual for environmental loss contingencies, noncurrent 18,000,000us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
21,000,000us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
 
Brazilian Tax Authorities and Other Third Parties [Member]      
Loss Contingency Accrual [Abstract]      
Settlement liabilities 12,000,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LitigationCaseAxis
= nvl_BrazilianTaxAuthoritiesandOtherThirdPartiesMember
18,000,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LitigationCaseAxis
= nvl_BrazilianTaxAuthoritiesandOtherThirdPartiesMember
 
Brazil [Member]      
Loss Contingency Accrual [Abstract]      
Settlement liabilities 73,000,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= country_BR
107,000,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= country_BR
 
Brazil [Member] | Settlement with Taxing Authority [Member] | Other Long-term Assets - Third Parties [Member]      
Loss Contingency Accrual [Abstract]      
Cash deposits 3,000,000us-gaap_DepositsAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember
/ us-gaap_LitigationCaseAxis
= us-gaap_SettlementWithTaxingAuthorityMember
/ us-gaap_StatementGeographicalAxis
= country_BR
6,000,000us-gaap_DepositsAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember
/ us-gaap_LitigationCaseAxis
= us-gaap_SettlementWithTaxingAuthorityMember
/ us-gaap_StatementGeographicalAxis
= country_BR
 
Brazil [Member] | Settlement with Taxing Authority [Member] | Accrued Expenses and Other Current Liabilities [Member]      
Loss Contingency Accrual [Abstract]      
Settlement liabilities 7,000,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_BalanceSheetLocationAxis
= nvl_AccruedExpensesAndOtherCurrentLiabilitiesMember
/ us-gaap_LitigationCaseAxis
= us-gaap_SettlementWithTaxingAuthorityMember
/ us-gaap_StatementGeographicalAxis
= country_BR
11,000,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_BalanceSheetLocationAxis
= nvl_AccruedExpensesAndOtherCurrentLiabilitiesMember
/ us-gaap_LitigationCaseAxis
= us-gaap_SettlementWithTaxingAuthorityMember
/ us-gaap_StatementGeographicalAxis
= country_BR
 
Brazil [Member] | Settlement with Taxing Authority [Member] | Other Long-term Liabilities [Member]      
Loss Contingency Accrual [Abstract]      
Settlement liabilities 66,000,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
/ us-gaap_LitigationCaseAxis
= us-gaap_SettlementWithTaxingAuthorityMember
/ us-gaap_StatementGeographicalAxis
= country_BR
96,000,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
/ us-gaap_LitigationCaseAxis
= us-gaap_SettlementWithTaxingAuthorityMember
/ us-gaap_StatementGeographicalAxis
= country_BR
 
Restructuring Action [Member]      
Accrual for Environmental Loss Contingencies [Abstract]      
Accrual for environmental loss contingencies $ 18,000,000us-gaap_AccrualForEnvironmentalLossContingencies
/ us-gaap_EnvironmentalRemediationContingencyAxis
= nvl_RestructuringActionMember