Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
OPERATING ACTIVITIES
Net income	$ 148us-gaap_ProfitLoss	$ 104us-gaap_ProfitLoss	$ 203us-gaap_ProfitLoss
Adjustments to determine net cash provided by operating activities:
Depreciation and amortization	352	334	292
Loss (gain) on unrealized derivatives and other realized derivatives in investing activities, net	39	(3)	(28)
Gain on assets held for sale, net	(22)us-gaap_GainLossOnDispositionOfAssets	(6)us-gaap_GainLossOnDispositionOfAssets	(3)us-gaap_GainLossOnDispositionOfAssets
Loss on sale of assets	5	9	6
Impairment charges	7us-gaap_AssetImpairmentCharges	24us-gaap_AssetImpairmentCharges	4us-gaap_AssetImpairmentCharges
Loss on extinguishment of debt	0	0	7
Deferred income taxes	(88)us-gaap_DeferredIncomeTaxExpenseBenefit	(129)us-gaap_DeferredIncomeTaxExpenseBenefit	(31)us-gaap_DeferredIncomeTaxExpenseBenefit
Amortization of fair value adjustments, net	10us-gaap_OtherNoncashExpense	12us-gaap_OtherNoncashExpense	12us-gaap_OtherNoncashExpense
Equity in net loss of non-consolidated affiliates	5	12	16
(Gain) loss on foreign exchange remeasurement of debt	(5)	(2)	8
Amortization of debt issuance costs and carrying value adjustments	25us-gaap_AmortizationOfFinancingCosts	26us-gaap_AmortizationOfFinancingCosts	27us-gaap_AmortizationOfFinancingCosts
Other, net	1us-gaap_OtherNoncashIncomeExpense	(4)us-gaap_OtherNoncashIncomeExpense	1us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities including assets and liabilities held for sale (net of effects from divestitures):
Accounts receivable	(54)	106	(121)
Inventories	(390)us-gaap_IncreaseDecreaseInInventories	17us-gaap_IncreaseDecreaseInInventories	(160)us-gaap_IncreaseDecreaseInInventories
Accounts payable	578	159	6
Other current assets	(27)	0	(36)
Other current liabilities	66	32	28
Other noncurrent assets	7	(9)	(10)
Other noncurrent liabilities	(53)	20	(18)
Net cash provided by operating activities	604	702	203
INVESTING ACTIVITIES
Capital expenditures	(518)	(717)	(775)
Proceeds from sales of assets, third party, net of transaction fees and hedging	117	8	19
Proceeds from the sale of assets, related party, net of transaction fees	0	8	2
(Outflows) proceeds from investments in and advances to non-consolidated affiliates, net	(20)	(16)	3
Proceeds from settlement of other undesignated derivative instruments, net	5	15	4
Net cash used in investing activities	(416)	(702)	(747)
FINANCING ACTIVITIES
Proceeds from issuance of long-term and short-term borrowings	362	169	319
Principal payments of long-term and short-term borrowings	(324)us-gaap_RepaymentsOfLongTermDebt	(164)us-gaap_RepaymentsOfLongTermDebt	(97)us-gaap_RepaymentsOfLongTermDebt
Revolving credit facilities and other, net	160	208	332
Return of capital to our common shareholder	(250)us-gaap_PaymentsOfCapitalDistribution	0us-gaap_PaymentsOfCapitalDistribution	0us-gaap_PaymentsOfCapitalDistribution
Dividends, noncontrolling interest	(1)	0	(2)
Acquisition of noncontrolling interest in Novelis Korea Ltd.	0us-gaap_PaymentsToMinorityShareholders	0us-gaap_PaymentsToMinorityShareholders	(9)us-gaap_PaymentsToMinorityShareholders
Debt issuance costs	(3)us-gaap_PaymentsOfDebtIssuanceCosts	(8)us-gaap_PaymentsOfDebtIssuanceCosts	(8)us-gaap_PaymentsOfDebtIssuanceCosts
Net cash (used in) provided by financing activities	(56)	205	535
Net increase (decrease) in cash and cash equivalents	132	205	(9)
Effect of exchange rate changes on cash	(13)	3	(7)
Cash and cash equivalents — beginning of period	509	301	317
Cash and cash equivalents — end of period	$ 628	$ 509	$ 301

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Amount of cash outflow in the form of ordinary dividends provided by the non-wholly owned subsidiary to noncontrolling interests.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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