3.7.0.1 html 664 632 1 false 174 0 false 18 false false R1.htm 0001000 - Document - Document and Entity Information Sheet http://www.novelis.com/role/DocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 1001000 - Statement - Consolidated Statements of Operations Sheet http://www.novelis.com/role/ConsolidatedStatementsOfOperations Consolidated Statements of Operations Statements 2 false false R3.htm 1002000 - Statement - Consolidated Statements of Comprehensive Income (Loss) Sheet http://www.novelis.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss Consolidated Statements of Comprehensive Income (Loss) Statements 3 false false R4.htm 1003000 - Statement - Consolidated Balance Sheets Sheet http://www.novelis.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 4 false false R5.htm 1003501 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.novelis.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 5 false false R6.htm 1004000 - Statement - Consolidated Statements of Cash Flows Sheet http://www.novelis.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 6 false false R7.htm 1005000 - Statement - Consolidated Statement of Shareholder's Equity Sheet http://www.novelis.com/role/ConsolidatedStatementOfShareholdersEquity Consolidated Statement of Shareholder's Equity Statements 7 false false R8.htm 1005501 - Statement - Consolidated Statement of Shareholder's Equity (Parenthetical) Sheet http://www.novelis.com/role/ConsolidatedStatementOfShareholdersEquityParenthetical Consolidated Statement of Shareholder's Equity (Parenthetical) Statements 8 false false R9.htm 2101100 - Disclosure - Business and Summary of Significant Accounting Policies Sheet http://www.novelis.com/role/BusinessAndSummaryOfSignificantAccountingPolicies Business and Summary of Significant Accounting Policies Notes 9 false false R10.htm 2102100 - Disclosure - Restructuring and Impairment Sheet http://www.novelis.com/role/RestructuringAndImpairment Restructuring and Impairment Notes 10 false false R11.htm 2103100 - Disclosure - Accounts Receivable Sheet http://www.novelis.com/role/AccountsReceivable Accounts Receivable Notes 11 false false R12.htm 2105100 - Disclosure - Inventories Sheet http://www.novelis.com/role/Inventories Inventories Notes 12 false false R13.htm 2106100 - Disclosure - Assets Held For Sale Sheet http://www.novelis.com/role/AssetsHeldForSale Assets Held For Sale Notes 13 false false R14.htm 2107100 - Disclosure - Property, Plant and Equipment Sheet http://www.novelis.com/role/PropertyPlantAndEquipment Property, Plant and Equipment Notes 14 false false R15.htm 2108100 - Disclosure - Goodwill and Intangible Assets Sheet http://www.novelis.com/role/GoodwillAndIntangibleAssets Goodwill and Intangible Assets Notes 15 false false R16.htm 2109100 - Disclosure - Consolidation Sheet http://www.novelis.com/role/Consolidation Consolidation Notes 16 false false R17.htm 2110100 - Disclosure - Investment in and Advances to Non-Consolidated Affiliates and Related Party Transactions Sheet http://www.novelis.com/role/InvestmentInAndAdvancesToNonConsolidatedAffiliatesAndRelatedPartyTransactions Investment in and Advances to Non-Consolidated Affiliates and Related Party Transactions Notes 17 false false R18.htm 2111100 - Disclosure - Accrued Expenses and Other Current Liabilities Sheet http://www.novelis.com/role/AccruedExpensesAndOtherCurrentLiabilities Accrued Expenses and Other Current Liabilities Notes 18 false false R19.htm 2112100 - Disclosure - Debt Sheet http://www.novelis.com/role/Debt Debt Notes 19 false false R20.htm 2113100 - Disclosure - Share-Based Compensation Sheet http://www.novelis.com/role/ShareBasedCompensation Share-Based Compensation Notes 20 false false R21.htm 2114100 - Disclosure - Postretirement Benefit Plans Sheet http://www.novelis.com/role/PostretirementBenefitPlans Postretirement Benefit Plans Notes 21 false false R22.htm 2115100 - Disclosure - Currency (Gains) Losses Sheet http://www.novelis.com/role/CurrencyGainsLosses Currency (Gains) Losses Notes 22 false false R23.htm 2116100 - Disclosure - Financial Instruments and Commodity Contracts Sheet http://www.novelis.com/role/FinancialInstrumentsAndCommodityContracts Financial Instruments and Commodity Contracts Notes 23 false false R24.htm 2117100 - Disclosure - Accumulated Other Comprehensive Loss Sheet http://www.novelis.com/role/AccumulatedOtherComprehensiveLoss Accumulated Other Comprehensive Loss Notes 24 false false R25.htm 2118100 - Disclosure - Fair Value Measurements Sheet http://www.novelis.com/role/FairValueMeasurements Fair Value Measurements Notes 25 false false R26.htm 2119100 - Disclosure - Other Expense (Income) Sheet http://www.novelis.com/role/OtherExpenseIncome Other Expense (Income) Notes 26 false false R27.htm 2120100 - Disclosure - Income Taxes Sheet http://www.novelis.com/role/IncomeTaxes Income Taxes Notes 27 false false R28.htm 2121100 - Disclosure - Commitments and Contingencies Sheet http://www.novelis.com/role/CommitmentsAndContingencies Commitments and Contingencies Notes 28 false false R29.htm 2122100 - Disclosure - Segment, Geographical Area, Major Customer and Major Supplier Information Sheet http://www.novelis.com/role/SegmentGeographicalAreaMajorCustomerAndMajorSupplierInformation Segment, Geographical Area, Major Customer and Major Supplier Information Notes 29 false false R30.htm 2123100 - Disclosure - Supplemental Information Sheet http://www.novelis.com/role/SupplementalInformation Supplemental Information Notes 30 false false R31.htm 2124100 - Disclosure - Quarterly Results (Unaudited) Sheet http://www.novelis.com/role/QuarterlyResultsUnaudited Quarterly Results (Unaudited) Notes 31 false false R32.htm 2201201 - Disclosure - Business and Summary of Significant Accounting Policies (Policies) Sheet http://www.novelis.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesPolicies Business and Summary of Significant Accounting Policies (Policies) Policies http://www.novelis.com/role/BusinessAndSummaryOfSignificantAccountingPolicies 32 false false R33.htm 2301302 - Disclosure - Business and Summary of Significant Accounting Policies (Tables) Sheet http://www.novelis.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesTables Business and Summary of Significant Accounting Policies (Tables) Tables http://www.novelis.com/role/BusinessAndSummaryOfSignificantAccountingPolicies 33 false false R34.htm 2302301 - Disclosure - Restructuring and Impairment (Tables) Sheet http://www.novelis.com/role/RestructuringAndImpairmentTables Restructuring and Impairment (Tables) Tables http://www.novelis.com/role/RestructuringAndImpairment 34 false false R35.htm 2303301 - Disclosure - Accounts Receivable (Tables) Sheet http://www.novelis.com/role/AccountsReceivableTables Accounts Receivable (Tables) Tables http://www.novelis.com/role/AccountsReceivable 35 false false R36.htm 2305301 - Disclosure - Inventories (Tables) Sheet http://www.novelis.com/role/InventoriesTables Inventories (Tables) Tables http://www.novelis.com/role/Inventories 36 false false R37.htm 2307301 - Disclosure - Property, Plant and Equipment (Tables) Sheet http://www.novelis.com/role/PropertyPlantAndEquipmentTables Property, Plant and Equipment (Tables) Tables http://www.novelis.com/role/PropertyPlantAndEquipment 37 false false R38.htm 2308301 - Disclosure - Goodwill and Intangible Assets (Tables) Sheet http://www.novelis.com/role/GoodwillAndIntangibleAssetsTables Goodwill and Intangible Assets (Tables) Tables http://www.novelis.com/role/GoodwillAndIntangibleAssets 38 false false R39.htm 2309301 - Disclosure - Consolidation (Tables) Sheet http://www.novelis.com/role/ConsolidationTables Consolidation (Tables) Tables http://www.novelis.com/role/Consolidation 39 false false R40.htm 2310301 - Disclosure - Investment in and Advances to Non-Consolidated Affiliates and Related Party Transactions (Tables) Sheet http://www.novelis.com/role/InvestmentInAndAdvancesToNonConsolidatedAffiliatesAndRelatedPartyTransactionsTables Investment in and Advances to Non-Consolidated Affiliates and Related Party Transactions (Tables) Tables http://www.novelis.com/role/InvestmentInAndAdvancesToNonConsolidatedAffiliatesAndRelatedPartyTransactions 40 false false R41.htm 2311301 - Disclosure - Accrued Expenses and Other Current Liabilities (Tables) Sheet http://www.novelis.com/role/AccruedExpensesAndOtherCurrentLiabilitiesTables Accrued Expenses and Other Current Liabilities (Tables) Tables http://www.novelis.com/role/AccruedExpensesAndOtherCurrentLiabilities 41 false false R42.htm 2312301 - Disclosure - Debt (Tables) Sheet http://www.novelis.com/role/DebtTables Debt (Tables) Tables http://www.novelis.com/role/Debt 42 false false R43.htm 2313301 - Disclosure - Share-Based Compensation (Tables) Sheet http://www.novelis.com/role/ShareBasedCompensationTables Share-Based Compensation (Tables) Tables http://www.novelis.com/role/ShareBasedCompensation 43 false false R44.htm 2314301 - Disclosure - Postretirement Benefit Plans (Tables) Sheet http://www.novelis.com/role/PostretirementBenefitPlansTables Postretirement Benefit Plans (Tables) Tables http://www.novelis.com/role/PostretirementBenefitPlans 44 false false R45.htm 2315301 - Disclosure - Currency (Gains) Losses (Tables) Sheet http://www.novelis.com/role/CurrencyGainsLossesTables Currency (Gains) Losses (Tables) Tables http://www.novelis.com/role/CurrencyGainsLosses 45 false false R46.htm 2316301 - Disclosure - Financial Instruments and Commodity Contracts (Tables) Sheet http://www.novelis.com/role/FinancialInstrumentsAndCommodityContractsTables Financial Instruments and Commodity Contracts (Tables) Tables http://www.novelis.com/role/FinancialInstrumentsAndCommodityContracts 46 false false R47.htm 2317301 - Disclosure - Accumulated Other Comprehensive Loss (Tables) Sheet http://www.novelis.com/role/AccumulatedOtherComprehensiveLossTables Accumulated Other Comprehensive Loss (Tables) Tables http://www.novelis.com/role/AccumulatedOtherComprehensiveLoss 47 false false R48.htm 2318301 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.novelis.com/role/FairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://www.novelis.com/role/FairValueMeasurements 48 false false R49.htm 2319301 - Disclosure - Other Expense (Income) (Tables) Sheet http://www.novelis.com/role/OtherExpenseIncomeTables Other Expense (Income) (Tables) Tables http://www.novelis.com/role/OtherExpenseIncome 49 false false R50.htm 2320301 - Disclosure - Income Taxes (Tables) Sheet http://www.novelis.com/role/IncomeTaxesTables Income Taxes (Tables) Tables http://www.novelis.com/role/IncomeTaxes 50 false false R51.htm 2321301 - Disclosure - Commitments and Contingencies (Tables) Sheet http://www.novelis.com/role/CommitmentsAndContingenciesTables Commitments and Contingencies (Tables) Tables http://www.novelis.com/role/CommitmentsAndContingencies 51 false false R52.htm 2322301 - Disclosure - Segment, Geographical Area, Major Customer and Major Supplier Information (Tables) Sheet http://www.novelis.com/role/SegmentGeographicalAreaMajorCustomerAndMajorSupplierInformationTables Segment, Geographical Area, Major Customer and Major Supplier Information (Tables) Tables http://www.novelis.com/role/SegmentGeographicalAreaMajorCustomerAndMajorSupplierInformation 52 false false R53.htm 2323301 - Disclosure - Supplemental Information (Tables) Sheet http://www.novelis.com/role/SupplementalInformationTables Supplemental Information (Tables) Tables http://www.novelis.com/role/SupplementalInformation 53 false false R54.htm 2324301 - Disclosure - Quarterly Results (Unaudited) (Tables) Sheet http://www.novelis.com/role/QuarterlyResultsUnauditedTables Quarterly Results (Unaudited) (Tables) Tables http://www.novelis.com/role/QuarterlyResultsUnaudited 54 false false R55.htm 2401403 - Disclosure - Business and Summary of Significant Accounting Policies (Details Textual) Sheet http://www.novelis.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesDetailsTextual Business and Summary of Significant Accounting Policies (Details Textual) Details http://www.novelis.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesTables 55 false false R56.htm 2401404 - Disclosure - Business and Summary of Significant Accounting Policies (Property, Plant and Equipment) (Details) Sheet http://www.novelis.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesPropertyPlantAndEquipmentDetails Business and Summary of Significant Accounting Policies (Property, Plant and Equipment) (Details) Details http://www.novelis.com/role/BusinessAndSummaryOfSignificantAccountingPoliciesTables 56 false false R57.htm 2402402 - Disclosure - Restructuring and Impairment (Restructuring Liability) (Details) Sheet http://www.novelis.com/role/RestructuringAndImpairmentRestructuringLiabilityDetails Restructuring and Impairment (Restructuring Liability) (Details) Details http://www.novelis.com/role/RestructuringAndImpairmentTables 57 false false R58.htm 2402403 - Disclosure - Restructuring and Impairment (Restructuring Activity) (Details) Sheet http://www.novelis.com/role/RestructuringAndImpairmentRestructuringActivityDetails Restructuring and Impairment (Restructuring Activity) (Details) Details http://www.novelis.com/role/RestructuringAndImpairmentTables 58 false false R59.htm 2402404 - Disclosure - Restructuring and Impairment (Details Textual) Sheet http://www.novelis.com/role/RestructuringAndImpairmentDetailsTextual Restructuring and Impairment (Details Textual) Details http://www.novelis.com/role/RestructuringAndImpairmentTables 59 false false R60.htm 2403402 - Disclosure - Accounts Receivable (Details) Sheet http://www.novelis.com/role/AccountsReceivableDetails Accounts Receivable (Details) Details http://www.novelis.com/role/AccountsReceivableTables 60 false false R61.htm 2403403 - Disclosure - Accounts Receivable (Allowance for Doubtful Accounts Activity) (Details) Sheet http://www.novelis.com/role/AccountsReceivableAllowanceForDoubtfulAccountsActivityDetails Accounts Receivable (Allowance for Doubtful Accounts Activity) (Details) Details http://www.novelis.com/role/AccountsReceivableTables 61 false false R62.htm 2403404 - Disclosure - Accounts Receivable (Factoring Activities) (Details) Sheet http://www.novelis.com/role/AccountsReceivableFactoringActivitiesDetails Accounts Receivable (Factoring Activities) (Details) Details http://www.novelis.com/role/AccountsReceivableTables 62 false false R63.htm 2403405 - Disclosure - Accounts Receivable (Details Textual) Sheet http://www.novelis.com/role/AccountsReceivableDetailsTextual Accounts Receivable (Details Textual) Details http://www.novelis.com/role/AccountsReceivableTables 63 false false R64.htm 2405402 - Disclosure - Inventories (Details) Sheet http://www.novelis.com/role/InventoriesDetails Inventories (Details) Details http://www.novelis.com/role/InventoriesTables 64 false false R65.htm 2406401 - Disclosure - Assets Held For Sale (Details Textual) Sheet http://www.novelis.com/role/AssetsHeldForSaleDetailsTextual Assets Held For Sale (Details Textual) Details http://www.novelis.com/role/AssetsHeldForSale 65 false false R66.htm 2407402 - Disclosure - Property, Plant and Equipment (Details) Sheet http://www.novelis.com/role/PropertyPlantAndEquipmentDetails Property, Plant and Equipment (Details) Details http://www.novelis.com/role/PropertyPlantAndEquipmentTables 66 false false R67.htm 2407403 - Disclosure - Property, Plant and Equipment (Depreciation Expense) (Details) Sheet http://www.novelis.com/role/PropertyPlantAndEquipmentDepreciationExpenseDetails Property, Plant and Equipment (Depreciation Expense) (Details) Details http://www.novelis.com/role/PropertyPlantAndEquipmentTables 67 false false R68.htm 2407404 - Disclosure - Property, Plant and Equipment (Rent Expense) (Details) Sheet http://www.novelis.com/role/PropertyPlantAndEquipmentRentExpenseDetails Property, Plant and Equipment (Rent Expense) (Details) Details http://www.novelis.com/role/PropertyPlantAndEquipmentTables 68 false false R69.htm 2407405 - Disclosure - Property, Plant and Equipment (Future Minimum Lease Payment) (Details) Sheet http://www.novelis.com/role/PropertyPlantAndEquipmentFutureMinimumLeasePaymentDetails Property, Plant and Equipment (Future Minimum Lease Payment) (Details) Details http://www.novelis.com/role/PropertyPlantAndEquipmentTables 69 false false R70.htm 2407406 - Disclosure - Property, Plant and Equipment (Capital Lease Obligations) (Details) Sheet http://www.novelis.com/role/PropertyPlantAndEquipmentCapitalLeaseObligationsDetails Property, Plant and Equipment (Capital Lease Obligations) (Details) Details http://www.novelis.com/role/PropertyPlantAndEquipmentTables 70 false false R71.htm 2407407 - Disclosure - Property, Plant and Equipment (Details Textual) Sheet http://www.novelis.com/role/PropertyPlantAndEquipmentDetailsTextual Property, Plant and Equipment (Details Textual) Details http://www.novelis.com/role/PropertyPlantAndEquipmentTables 71 false false R72.htm 2408402 - Disclosure - Goodwill and Intangible Assets (Goodwill) (Details) Sheet http://www.novelis.com/role/GoodwillAndIntangibleAssetsGoodwillDetails Goodwill and Intangible Assets (Goodwill) (Details) Details http://www.novelis.com/role/GoodwillAndIntangibleAssetsTables 72 false false R73.htm 2408403 - Disclosure - Goodwill and Intangible Assets (Intangible Assets, Net) (Details) Sheet http://www.novelis.com/role/GoodwillAndIntangibleAssetsIntangibleAssetsNetDetails Goodwill and Intangible Assets (Intangible Assets, Net) (Details) Details http://www.novelis.com/role/GoodwillAndIntangibleAssetsTables 73 false false R74.htm 2408404 - Disclosure - Goodwill and Intangible Assets (Amortization of Intangibles) (Details) Sheet http://www.novelis.com/role/GoodwillAndIntangibleAssetsAmortizationOfIntangiblesDetails Goodwill and Intangible Assets (Amortization of Intangibles) (Details) Details http://www.novelis.com/role/GoodwillAndIntangibleAssetsTables 74 false false R75.htm 2408405 - Disclosure - Goodwill and Intangible Assets (Future Amortization Expense) (Details) Sheet http://www.novelis.com/role/GoodwillAndIntangibleAssetsFutureAmortizationExpenseDetails Goodwill and Intangible Assets (Future Amortization Expense) (Details) Details http://www.novelis.com/role/GoodwillAndIntangibleAssetsTables 75 false false R76.htm 2409402 - Disclosure - Consolidation (Details) Sheet http://www.novelis.com/role/ConsolidationDetails Consolidation (Details) Details http://www.novelis.com/role/ConsolidationTables 76 false false R77.htm 2410402 - Disclosure - Investment in and Advances to Non-Consolidated Affiliates and Related Party Transactions (Ownership Structure and Percentage of Non-consolidated Affiliates) (Details) Sheet http://www.novelis.com/role/InvestmentInAndAdvancesToNonConsolidatedAffiliatesAndRelatedPartyTransactionsOwnershipStructureAndPercentageOfNonConsolidatedAffiliatesDetails Investment in and Advances to Non-Consolidated Affiliates and Related Party Transactions (Ownership Structure and Percentage of Non-consolidated Affiliates) (Details) Details http://www.novelis.com/role/InvestmentInAndAdvancesToNonConsolidatedAffiliatesAndRelatedPartyTransactionsTables 77 false false R78.htm 2410403 - Disclosure - Investment in and Advances to Non-Consolidated Affiliates and Related Party Transactions (Assets, Liabilities and Equity of Equity Method Affiliates) (Details) Sheet http://www.novelis.com/role/InvestmentInAndAdvancesToNonConsolidatedAffiliatesAndRelatedPartyTransactionsAssetsLiabilitiesAndEquityOfEquityMethodAffiliatesDetails Investment in and Advances to Non-Consolidated Affiliates and Related Party Transactions (Assets, Liabilities and Equity of Equity Method Affiliates) (Details) Details http://www.novelis.com/role/InvestmentInAndAdvancesToNonConsolidatedAffiliatesAndRelatedPartyTransactionsTables 78 false false R79.htm 2410404 - Disclosure - Investment in and Advances to Non-Consolidated Affiliates and Related Party Transactions (Results of Operations of Equity Method Affiliates) (Details) Sheet http://www.novelis.com/role/InvestmentInAndAdvancesToNonConsolidatedAffiliatesAndRelatedPartyTransactionsResultsOfOperationsOfEquityMethodAffiliatesDetails Investment in and Advances to Non-Consolidated Affiliates and Related Party Transactions (Results of Operations of Equity Method Affiliates) (Details) Details http://www.novelis.com/role/InvestmentInAndAdvancesToNonConsolidatedAffiliatesAndRelatedPartyTransactionsTables 79 false false R80.htm 2410405 - Disclosure - Investment in and Advances to Non-Consolidated Affiliates and Related Party Transactions (Period-end Account Balances with Non-consolidated Affiliates) (Details) Sheet http://www.novelis.com/role/InvestmentInAndAdvancesToNonConsolidatedAffiliatesAndRelatedPartyTransactionsPeriodEndAccountBalancesWithNonConsolidatedAffiliatesDetails Investment in and Advances to Non-Consolidated Affiliates and Related Party Transactions (Period-end Account Balances with Non-consolidated Affiliates) (Details) Details http://www.novelis.com/role/InvestmentInAndAdvancesToNonConsolidatedAffiliatesAndRelatedPartyTransactionsTables 80 false false R81.htm 2410406 - Disclosure - Investment in and Advances to Non-Consolidated Affiliates and Related Party Transactions (Details Textual) Sheet http://www.novelis.com/role/InvestmentInAndAdvancesToNonConsolidatedAffiliatesAndRelatedPartyTransactionsDetailsTextual Investment in and Advances to Non-Consolidated Affiliates and Related Party Transactions (Details Textual) Details http://www.novelis.com/role/InvestmentInAndAdvancesToNonConsolidatedAffiliatesAndRelatedPartyTransactionsTables 81 false false R82.htm 2411402 - Disclosure - Accrued Expenses and Other Current Liabilities (Details) Sheet http://www.novelis.com/role/AccruedExpensesAndOtherCurrentLiabilitiesDetails Accrued Expenses and Other Current Liabilities (Details) Details http://www.novelis.com/role/AccruedExpensesAndOtherCurrentLiabilitiesTables 82 false false R83.htm 2412402 - Disclosure - Schedule of Debt (Details) Sheet http://www.novelis.com/role/ScheduleOfDebtDetails Schedule of Debt (Details) Details 83 false false R84.htm 2412403 - Disclosure - Debt (Principal Payment Requirements) (Details) Sheet http://www.novelis.com/role/DebtPrincipalPaymentRequirementsDetails Debt (Principal Payment Requirements) (Details) Details http://www.novelis.com/role/DebtTables 84 false false R85.htm 2412404 - Disclosure - Debt (Senior Secured Credit Facilities) (Details) Sheet http://www.novelis.com/role/DebtSeniorSecuredCreditFacilitiesDetails Debt (Senior Secured Credit Facilities) (Details) Details http://www.novelis.com/role/DebtTables 85 false false R86.htm 2412405 - Disclosure - Debt (Short-term Borrowings (Details) Sheet http://www.novelis.com/role/DebtShortTermBorrowingsDetails Debt (Short-term Borrowings (Details) Details http://www.novelis.com/role/DebtTables 86 false false R87.htm 2412406 - Disclosure - Debt (Senior Notes) (Details) Notes http://www.novelis.com/role/DebtSeniorNotesDetails Debt (Senior Notes) (Details) Details http://www.novelis.com/role/DebtTables 87 false false R88.htm 2412407 - Disclosure - Debt (Bank Loans) (Details) Sheet http://www.novelis.com/role/DebtBankLoansDetails Debt (Bank Loans) (Details) Details http://www.novelis.com/role/DebtTables 88 false false R89.htm 2412408 - Disclosure - Debt (Other Long-term Debt) (Details) Sheet http://www.novelis.com/role/DebtOtherLongTermDebtDetails Debt (Other Long-term Debt) (Details) Details http://www.novelis.com/role/DebtTables 89 false false R90.htm 2413402 - Disclosure - Share-Based Compensation (Details) Sheet http://www.novelis.com/role/ShareBasedCompensationDetails Share-Based Compensation (Details) Details http://www.novelis.com/role/ShareBasedCompensationTables 90 false false R91.htm 2413403 - Disclosure - Share-Based Compensation (RSUs Activity) (Details) Sheet http://www.novelis.com/role/ShareBasedCompensationRsusActivityDetails Share-Based Compensation (RSUs Activity) (Details) Details http://www.novelis.com/role/ShareBasedCompensationTables 91 false false R92.htm 2413404 - Disclosure - Share-Based Compensation (SARs Activity) (Details) Sheet http://www.novelis.com/role/ShareBasedCompensationSarsActivityDetails Share-Based Compensation (SARs Activity) (Details) Details http://www.novelis.com/role/ShareBasedCompensationTables 92 false false R93.htm 2413405 - Disclosure - Share-Based Compensation (Fair Value Assumptions) (Details) Sheet http://www.novelis.com/role/ShareBasedCompensationFairValueAssumptionsDetails Share-Based Compensation (Fair Value Assumptions) (Details) Details http://www.novelis.com/role/ShareBasedCompensationTables 93 false false R94.htm 2413406 - Disclosure - Share-Based Compensation (Details Textual) Sheet http://www.novelis.com/role/ShareBasedCompensationDetailsTextual Share-Based Compensation (Details Textual) Details http://www.novelis.com/role/ShareBasedCompensationTables 94 false false R95.htm 2414402 - Disclosure - Postretirement Benefit Plans (Employer Contributions to Plans) (Details) Sheet http://www.novelis.com/role/PostretirementBenefitPlansEmployerContributionsToPlansDetails Postretirement Benefit Plans (Employer Contributions to Plans) (Details) Details http://www.novelis.com/role/PostretirementBenefitPlansTables 95 false false R96.htm 2414403 - Disclosure - (Change in Benefit Obligation) (Details) Sheet http://www.novelis.com/role/ChangeInBenefitObligationDetails (Change in Benefit Obligation) (Details) Details 96 false false R97.htm 2414404 - Disclosure - Postretirement Benefit Plans (Change in Fair Value of Plan Assets) (Details) Sheet http://www.novelis.com/role/PostretirementBenefitPlansChangeInFairValueOfPlanAssetsDetails Postretirement Benefit Plans (Change in Fair Value of Plan Assets) (Details) Details http://www.novelis.com/role/PostretirementBenefitPlansTables 97 false false R98.htm 2414405 - Disclosure - Postretirement Benefit Plans (Funded Status and Amounts Recognized) (Details) Sheet http://www.novelis.com/role/PostretirementBenefitPlansFundedStatusAndAmountsRecognizedDetails Postretirement Benefit Plans (Funded Status and Amounts Recognized) (Details) Details http://www.novelis.com/role/PostretirementBenefitPlansTables 98 false false R99.htm 2414406 - Disclosure - Postretirement Benefit Plans (Postretirement Amounts Recognized in AOCI) (Details) Sheet http://www.novelis.com/role/PostretirementBenefitPlansPostretirementAmountsRecognizedInAociDetails Postretirement Benefit Plans (Postretirement Amounts Recognized in AOCI) (Details) Details http://www.novelis.com/role/PostretirementBenefitPlansTables 99 false false R100.htm 2414407 - Disclosure - Postretirement Benefit Plans (Postretirement Changes Recognized in AOCI) (Details) Sheet http://www.novelis.com/role/PostretirementBenefitPlansPostretirementChangesRecognizedInAociDetails Postretirement Benefit Plans (Postretirement Changes Recognized in AOCI) (Details) Details http://www.novelis.com/role/PostretirementBenefitPlansTables 100 false false R101.htm 2414408 - Disclosure - Postretirement Benefit Plans (Pension Plan Obligations) (Details) Sheet http://www.novelis.com/role/PostretirementBenefitPlansPensionPlanObligationsDetails Postretirement Benefit Plans (Pension Plan Obligations) (Details) Details http://www.novelis.com/role/PostretirementBenefitPlansTables 101 false false R102.htm 2414409 - Disclosure - Postretirement Benefit Plans (Future Benefit Payments) (Details) Sheet http://www.novelis.com/role/PostretirementBenefitPlansFutureBenefitPaymentsDetails Postretirement Benefit Plans (Future Benefit Payments) (Details) Details http://www.novelis.com/role/PostretirementBenefitPlansTables 102 false false R103.htm 2414410 - Disclosure - Postretirement Benefit Plans (Components of Net Periodic Benefit Cost) (Details) Sheet http://www.novelis.com/role/PostretirementBenefitPlansComponentsOfNetPeriodicBenefitCostDetails Postretirement Benefit Plans (Components of Net Periodic Benefit Cost) (Details) Details http://www.novelis.com/role/PostretirementBenefitPlansTables 103 false false R104.htm 2414411 - Disclosure - Postretirement Benefit Plans (Actuarial Assumptions and Sensitivity Analysis) (Details) Sheet http://www.novelis.com/role/PostretirementBenefitPlansActuarialAssumptionsAndSensitivityAnalysisDetails Postretirement Benefit Plans (Actuarial Assumptions and Sensitivity Analysis) (Details) Details http://www.novelis.com/role/PostretirementBenefitPlansTables 104 false false R105.htm 2414412 - Disclosure - Postretirement Benefit Plans (Change of One Percentage Point) (Details) Sheet http://www.novelis.com/role/PostretirementBenefitPlansChangeOfOnePercentagePointDetails Postretirement Benefit Plans (Change of One Percentage Point) (Details) Details http://www.novelis.com/role/PostretirementBenefitPlansTables 105 false false R106.htm 2414413 - Disclosure - Postretirement Benefit Plans (Target and Actual Allocation Percentages) (Details) Sheet http://www.novelis.com/role/PostretirementBenefitPlansTargetAndActualAllocationPercentagesDetails Postretirement Benefit Plans (Target and Actual Allocation Percentages) (Details) Details http://www.novelis.com/role/PostretirementBenefitPlansTables 106 false false R107.htm 2414414 - Disclosure - Postretirement Benefit Plans (Pension Plan Assets) (Details) Sheet http://www.novelis.com/role/PostretirementBenefitPlansPensionPlanAssetsDetails Postretirement Benefit Plans (Pension Plan Assets) (Details) Details http://www.novelis.com/role/PostretirementBenefitPlansTables 107 false false R108.htm 2414415 - Disclosure - Postretirement Benefit Plans (Details Textual) Sheet http://www.novelis.com/role/PostretirementBenefitPlansDetailsTextual Postretirement Benefit Plans (Details Textual) Details http://www.novelis.com/role/PostretirementBenefitPlansTables 108 false false R109.htm 2415402 - Disclosure - Currency (Gains) Losses (Included in Other Expense (Income), Net) (Details) Sheet http://www.novelis.com/role/CurrencyGainsLossesIncludedInOtherExpenseIncomeNetDetails Currency (Gains) Losses (Included in Other Expense (Income), Net) (Details) Details http://www.novelis.com/role/CurrencyGainsLossesTables 109 false false R110.htm 2415403 - Disclosure - Currency (Gains) Losses (Included in AOCI) (Details) Sheet http://www.novelis.com/role/CurrencyGainsLossesIncludedInAociDetails Currency (Gains) Losses (Included in AOCI) (Details) Details http://www.novelis.com/role/CurrencyGainsLossesTables 110 false false R111.htm 2416402 - Disclosure - Financial Instruments and Commodity Contracts (Details) Sheet http://www.novelis.com/role/FinancialInstrumentsAndCommodityContractsDetails Financial Instruments and Commodity Contracts (Details) Details http://www.novelis.com/role/FinancialInstrumentsAndCommodityContractsTables 111 false false R112.htm 2416403 - Disclosure - Financial Instruments and Commodity Contracts (Gain (Loss) Recognized on Fair Value Hedges of Metal Price Risk) (Details) Sheet http://www.novelis.com/role/FinancialInstrumentsAndCommodityContractsGainLossRecognizedOnFairValueHedgesOfMetalPriceRiskDetails Financial Instruments and Commodity Contracts (Gain (Loss) Recognized on Fair Value Hedges of Metal Price Risk) (Details) Details http://www.novelis.com/role/FinancialInstrumentsAndCommodityContractsTables 112 false false R113.htm 2416404 - Disclosure - Financial Instruments and Commodity Contracts (Notional Amount (in kt)) (Details) Sheet http://www.novelis.com/role/FinancialInstrumentsAndCommodityContractsNotionalAmountInKtDetails Financial Instruments and Commodity Contracts (Notional Amount (in kt)) (Details) Details http://www.novelis.com/role/FinancialInstrumentsAndCommodityContractsTables 113 false false R114.htm 2416405 - Disclosure - Financial Instruments and Commodity Contracts (Gain (Loss) Recognition) (Details) Sheet http://www.novelis.com/role/FinancialInstrumentsAndCommodityContractsGainLossRecognitionDetails Financial Instruments and Commodity Contracts (Gain (Loss) Recognition) (Details) Details http://www.novelis.com/role/FinancialInstrumentsAndCommodityContractsTables 114 false false R115.htm 2416406 - Disclosure - Financial Instruments and Commodity Contracts (Impact on AOCI and Earnings) (Details) Sheet http://www.novelis.com/role/FinancialInstrumentsAndCommodityContractsImpactOnAociAndEarningsDetails Financial Instruments and Commodity Contracts (Impact on AOCI and Earnings) (Details) Details http://www.novelis.com/role/FinancialInstrumentsAndCommodityContractsTables 115 false false R116.htm 2416407 - Disclosure - Financial Instruments and Commodity Contracts (Gain (Loss) Reclassification) (Details) Sheet http://www.novelis.com/role/FinancialInstrumentsAndCommodityContractsGainLossReclassificationDetails Financial Instruments and Commodity Contracts (Gain (Loss) Reclassification) (Details) Details http://www.novelis.com/role/FinancialInstrumentsAndCommodityContractsTables 116 false false R117.htm 2416408 - Disclosure - Financial Instruments and Commodity Contracts (Details Textual) Sheet http://www.novelis.com/role/FinancialInstrumentsAndCommodityContractsDetailsTextual Financial Instruments and Commodity Contracts (Details Textual) Details http://www.novelis.com/role/FinancialInstrumentsAndCommodityContractsTables 117 false false R118.htm 2417402 - Disclosure - Accumulated Other Comprehensive Loss (Components of AOCI) (Details) Sheet http://www.novelis.com/role/AccumulatedOtherComprehensiveLossComponentsOfAociDetails Accumulated Other Comprehensive Loss (Components of AOCI) (Details) Details http://www.novelis.com/role/AccumulatedOtherComprehensiveLossTables 118 false false R119.htm 2418402 - Disclosure - Fair Value Measurements (Details) Sheet http://www.novelis.com/role/FairValueMeasurementsDetails Fair Value Measurements (Details) Details http://www.novelis.com/role/FairValueMeasurementsTables 119 false false R120.htm 2418403 - Disclosure - Fair Value Measurements (Reconciliation of Fair Value Activity for Level 3) (Details) Sheet http://www.novelis.com/role/FairValueMeasurementsReconciliationOfFairValueActivityForLevel3Details Fair Value Measurements (Reconciliation of Fair Value Activity for Level 3) (Details) Details http://www.novelis.com/role/FairValueMeasurementsTables 120 false false R121.htm 2418404 - Disclosure - Fair Value Measurements (Financial Instruments Not Recorded at Fair Value) (Details) Sheet http://www.novelis.com/role/FairValueMeasurementsFinancialInstrumentsNotRecordedAtFairValueDetails Fair Value Measurements (Financial Instruments Not Recorded at Fair Value) (Details) Details http://www.novelis.com/role/FairValueMeasurementsTables 121 false false R122.htm 2418405 - Disclosure - Fair Value Measurements (Details Textual) Sheet http://www.novelis.com/role/FairValueMeasurementsDetailsTextual Fair Value Measurements (Details Textual) Details http://www.novelis.com/role/FairValueMeasurementsTables 122 false false R123.htm 2419402 - Disclosure - Other Expense (Income) (Details) Sheet http://www.novelis.com/role/OtherExpenseIncomeDetails Other Expense (Income) (Details) Details http://www.novelis.com/role/OtherExpenseIncomeTables 123 false false R124.htm 2420402 - Disclosure - Income Taxes (Domestic and Foreign Components) (Details) Sheet http://www.novelis.com/role/IncomeTaxesDomesticAndForeignComponentsDetails Income Taxes (Domestic and Foreign Components) (Details) Details http://www.novelis.com/role/IncomeTaxesTables 124 false false R125.htm 2420403 - Disclosure - Income Taxes (Income Tax Provision) (Details) Sheet http://www.novelis.com/role/IncomeTaxesIncomeTaxProvisionDetails Income Taxes (Income Tax Provision) (Details) Details http://www.novelis.com/role/IncomeTaxesTables 125 false false R126.htm 2420404 - Disclosure - Income Taxes (Reconciliation of Statutory Tax Rates) (Details) Sheet http://www.novelis.com/role/IncomeTaxesReconciliationOfStatutoryTaxRatesDetails Income Taxes (Reconciliation of Statutory Tax Rates) (Details) Details http://www.novelis.com/role/IncomeTaxesTables 126 false false R127.htm 2420405 - Disclosure - Income Taxes (Deferred Tax Assets and Liabilities) (Details) Sheet http://www.novelis.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails Income Taxes (Deferred Tax Assets and Liabilities) (Details) Details http://www.novelis.com/role/IncomeTaxesTables 127 false false R128.htm 2420406 - Disclosure - Income Taxes (Unrecognized Tax Benefits Reconciliation) (Details) Sheet http://www.novelis.com/role/IncomeTaxesUnrecognizedTaxBenefitsReconciliationDetails Income Taxes (Unrecognized Tax Benefits Reconciliation) (Details) Details http://www.novelis.com/role/IncomeTaxesTables 128 false false R129.htm 2420407 - Disclosure - Income Taxes (Details Textual) Sheet http://www.novelis.com/role/IncomeTaxesDetailsTextual Income Taxes (Details Textual) Details http://www.novelis.com/role/IncomeTaxesTables 129 false false R130.htm 2421402 - Disclosure - Commitments and Contingencies (Details Textual) Sheet http://www.novelis.com/role/CommitmentsAndContingenciesDetailsTextual Commitments and Contingencies (Details Textual) Details http://www.novelis.com/role/CommitmentsAndContingenciesTables 130 false false R131.htm 2422402 - Disclosure - Segment, Geographical Area, Major Customer and Major Supplier Information (Details Textual) Sheet http://www.novelis.com/role/SegmentGeographicalAreaMajorCustomerAndMajorSupplierInformationDetailsTextual Segment, Geographical Area, Major Customer and Major Supplier Information (Details Textual) Details http://www.novelis.com/role/SegmentGeographicalAreaMajorCustomerAndMajorSupplierInformationTables 131 false false R132.htm 2422403 - Disclosure - Segment, Geographical Area, Major Customer and Major Supplier Information (Selected Operating Results) (Details) Sheet http://www.novelis.com/role/SegmentGeographicalAreaMajorCustomerAndMajorSupplierInformationSelectedOperatingResultsDetails Segment, Geographical Area, Major Customer and Major Supplier Information (Selected Operating Results) (Details) Details http://www.novelis.com/role/SegmentGeographicalAreaMajorCustomerAndMajorSupplierInformationTables 132 false false R133.htm 2422404 - Disclosure - Segment, Geographical Area, Major Customer and Major Supplier Information (Income Reconciliation) (Details) Sheet http://www.novelis.com/role/SegmentGeographicalAreaMajorCustomerAndMajorSupplierInformationIncomeReconciliationDetails Segment, Geographical Area, Major Customer and Major Supplier Information (Income Reconciliation) (Details) Details http://www.novelis.com/role/SegmentGeographicalAreaMajorCustomerAndMajorSupplierInformationTables 133 false false R134.htm 2422405 - Disclosure - Segment, Geographical Area, Major Customer and Major Supplier Information (Geographical Information - Net Sales) (Details) Sheet http://www.novelis.com/role/SegmentGeographicalAreaMajorCustomerAndMajorSupplierInformationGeographicalInformationNetSalesDetails Segment, Geographical Area, Major Customer and Major Supplier Information (Geographical Information - Net Sales) (Details) Details http://www.novelis.com/role/SegmentGeographicalAreaMajorCustomerAndMajorSupplierInformationTables 134 false false R135.htm 2422406 - Disclosure - Segment, Geographical Area, Major Customer and Major Supplier Information (Geographical Information - Assets) (Details) Sheet http://www.novelis.com/role/SegmentGeographicalAreaMajorCustomerAndMajorSupplierInformationGeographicalInformationAssetsDetails Segment, Geographical Area, Major Customer and Major Supplier Information (Geographical Information - Assets) (Details) Details http://www.novelis.com/role/SegmentGeographicalAreaMajorCustomerAndMajorSupplierInformationTables 135 false false R136.htm 2422407 - Disclosure - Segment, Geographical Area, Major Customer and Major Supplier Information (3 Largest Customers) (Details) Sheet http://www.novelis.com/role/SegmentGeographicalAreaMajorCustomerAndMajorSupplierInformation3LargestCustomersDetails Segment, Geographical Area, Major Customer and Major Supplier Information (3 Largest Customers) (Details) Details http://www.novelis.com/role/SegmentGeographicalAreaMajorCustomerAndMajorSupplierInformationTables 136 false false R137.htm 2422408 - Disclosure - Segment, Geographical Area, Major Customer and Major Supplier Information (Purchases - RTA) (Details) Sheet http://www.novelis.com/role/SegmentGeographicalAreaMajorCustomerAndMajorSupplierInformationPurchasesRtaDetails Segment, Geographical Area, Major Customer and Major Supplier Information (Purchases - RTA) (Details) Details http://www.novelis.com/role/SegmentGeographicalAreaMajorCustomerAndMajorSupplierInformationTables 137 false false R138.htm 2423402 - Disclosure - Supplemental Information (Details) Sheet http://www.novelis.com/role/SupplementalInformationDetails Supplemental Information (Details) Details http://www.novelis.com/role/SupplementalInformationTables 138 false false R139.htm 2423403 - Disclosure - Supplemental Information (Details Textual) Sheet http://www.novelis.com/role/SupplementalInformationDetailsTextual Supplemental Information (Details Textual) Details http://www.novelis.com/role/SupplementalInformationTables 139 false false R140.htm 2424402 - Disclosure - Quarterly Results (Unaudited) (Details) Sheet http://www.novelis.com/role/QuarterlyResultsUnauditedDetails Quarterly Results (Unaudited) (Details) Details http://www.novelis.com/role/QuarterlyResultsUnauditedTables 140 false false All Reports Book All Reports nvl-20170331.xml nvl-20170331.xsd nvl-20170331_cal.xml nvl-20170331_def.xml nvl-20170331_lab.xml nvl-20170331_pre.xml true true