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Assets Held For Sale (Details Textual) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Aug. 31, 2013
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
Dec. 31, 2013
Jun. 30, 2014
Feb. 28, 2015
Dec. 31, 2014
Assets Held-for-sale [Line Items]                                
Gain on assets held for sale   $ (1)us-gaap_GainLossOnDispositionOfAssets $ 12us-gaap_GainLossOnDispositionOfAssets $ 0us-gaap_GainLossOnDispositionOfAssets $ 11us-gaap_GainLossOnDispositionOfAssets $ 0us-gaap_GainLossOnDispositionOfAssets $ 6us-gaap_GainLossOnDispositionOfAssets $ 0us-gaap_GainLossOnDispositionOfAssets $ 0us-gaap_GainLossOnDispositionOfAssets $ 22us-gaap_GainLossOnDispositionOfAssets $ 6us-gaap_GainLossOnDispositionOfAssets $ 3us-gaap_GainLossOnDispositionOfAssets        
Proceeds from sale of assets, net                   117us-gaap_ProceedsFromSaleOfProductiveAssets 8us-gaap_ProceedsFromSaleOfProductiveAssets 19us-gaap_ProceedsFromSaleOfProductiveAssets        
Assets held for sale   6us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent       102us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent       6us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent 102us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent          
Cash received from sale of property held for sale 8us-gaap_ProceedsFromSaleOfPropertyHeldForSale                              
Liabilities held for sale   0us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation       11us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation       0us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation 11us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation          
Gain on assets held for sale                   (5)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (9)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (6)us-gaap_GainLossOnSaleOfPropertyPlantEquipment        
Brazil [Member]                                
Assets Held-for-sale [Line Items]                                
Gain on assets held for sale                   6us-gaap_GainLossOnDispositionOfAssets
/ us-gaap_StatementGeographicalAxis
= country_BR
           
Assets held for sale           1us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_StatementGeographicalAxis
= country_BR
        1us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_StatementGeographicalAxis
= country_BR
         
Cash received from sale of property held for sale                   8us-gaap_ProceedsFromSaleOfPropertyHeldForSale
/ us-gaap_StatementGeographicalAxis
= country_BR
    6us-gaap_ProceedsFromSaleOfPropertyHeldForSale
/ us-gaap_StatementGeographicalAxis
= country_BR
     
Gain on assets held for sale                         6us-gaap_GainLossOnSaleOfPropertyPlantEquipment
/ us-gaap_StatementGeographicalAxis
= country_BR
     
North America [Member]                                
Assets Held-for-sale [Line Items]                                
Gain on assets held for sale                   7us-gaap_GainLossOnDispositionOfAssets
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
           
Assets held for sale           31us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
        31us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
         
Cash received from sale of property held for sale                           29us-gaap_ProceedsFromSaleOfPropertyHeldForSale
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
   
Liabilities held for sale           11us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
        11us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
         
Consorcio Candonga [Member]                                
Assets Held-for-sale [Line Items]                                
Proceeds from sale of share in the joint venture                               63us-gaap_ProceedsFromDivestitureOfInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nvl_ConsorcioCandongaMember
Gain on assets held for sale                               23us-gaap_GainLossOnDispositionOfAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nvl_ConsorcioCandongaMember
Proceeds from sale of assets, net                             17us-gaap_ProceedsFromSaleOfProductiveAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nvl_ConsorcioCandongaMember
 
Loss on sale of assets                             14us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nvl_ConsorcioCandongaMember
 
Assets held for sale           $ 70us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nvl_ConsorcioCandongaMember
        $ 70us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= nvl_ConsorcioCandongaMember