Supplemental Guarantor Information (Cash Flow Statement) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities	$ 604	$ 702	$ 203
INVESTING ACTIVITIES
Capital expenditures	(518)	(717)	(775)
Proceeds from sales of assets, net - third parties	117	8	19
Proceeds from the sale of assets, net - related parties	0	8	2
Proceeds (outflows) from investment in and advances to affiliates, net	(20)	(16)	3
(Outflow) proceeds from settlement of undesignated derivative instruments, net	5	15	4
Net cash used in investing activities	(416)	(702)	(747)
Proceeds from issuance of debt
— third parties	362	169	319
— related parties	0us-gaap_ProceedsFromRelatedPartyDebt	0us-gaap_ProceedsFromRelatedPartyDebt	0us-gaap_ProceedsFromRelatedPartyDebt
Principal payments
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— related parties	0us-gaap_RepaymentsOfRelatedPartyDebt		0us-gaap_RepaymentsOfRelatedPartyDebt
Short-term borrowings, net
— third parties	160	208	332
— related parties	0	0	0
Return of capital to our common shareholder	(250)us-gaap_PaymentsOfCapitalDistribution	0us-gaap_PaymentsOfCapitalDistribution	0us-gaap_PaymentsOfCapitalDistribution
Intercompany return of capital	0	0
Dividends, noncontrolling interests and intercompany	(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
Parent [Member]
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities	29	144	87
INVESTING ACTIVITIES
Capital expenditures	(17)	(22)	(11)
Proceeds from sales of assets, net - third parties	29	0	7
Proceeds from the sale of assets, net - related parties		0	0
Proceeds (outflows) from investment in and advances to affiliates, net	250	(261)	(313)
(Outflow) proceeds from settlement of undesignated derivative instruments, net	(19)	(21)	13
Net cash used in investing activities	243	(304)	(304)
Proceeds from issuance of debt
— third parties	0	0	80
— related parties	0	0	49
Principal payments
— third parties	(21)	(19)	(92)
— related parties	0		0
Short-term borrowings, net
— third parties	27	162	205
— related parties	(25)	25	(10)
Return of capital to our common shareholder	(250)		0
Intercompany return of capital	0	0
Dividends, noncontrolling interests and intercompany	0	0	0
Acquisition of noncontrolling interest in Novelis Korea Ltd.			(9)
Debt issuance costs	(3)	(8)	(8)
Net cash (used in) provided by financing activities	(272)	160	215
Net increase (decrease) in cash and cash equivalents	0	0	(2)
Effect of exchange rate changes on cash	0	0	0
Cash and cash equivalents — beginning of period	4	4	6
Cash and cash equivalents — end of period	4	4	4
Guarantors [Member]
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities	659	893	230
INVESTING ACTIVITIES
Capital expenditures	(404)	(492)	(491)
Proceeds from sales of assets, net - third parties	88	7	12
Proceeds from the sale of assets, net - related parties		8	2
Proceeds (outflows) from investment in and advances to affiliates, net	5	(41)	(20)
(Outflow) proceeds from settlement of undesignated derivative instruments, net	23	21	4
Net cash used in investing activities	(288)	(497)	(493)
Proceeds from issuance of debt
— third parties	315	147	98
— related parties	500	0	9
Principal payments
— third parties	(266)	(143)	(5)
— related parties	(80)		(26)
Short-term borrowings, net
— third parties	97	44	127
— related parties	(686)	208	286
Return of capital to our common shareholder	0		1
Intercompany return of capital	0	0
Dividends, noncontrolling interests and intercompany	(244)	(479)	(237)
Acquisition of noncontrolling interest in Novelis Korea Ltd.			0
Debt issuance costs	0	0	0
Net cash (used in) provided by financing activities	(364)	(223)	253
Net increase (decrease) in cash and cash equivalents	7	173	(10)
Effect of exchange rate changes on cash	(14)	3	(9)
Cash and cash equivalents — beginning of period	372	196	215
Cash and cash equivalents — end of period	365	372	196
Non-Guarantors [Member]
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities	161	233	202
INVESTING ACTIVITIES
Capital expenditures	(97)	(203)	(273)
Proceeds from sales of assets, net - third parties	0	1	0
Proceeds from the sale of assets, net - related parties		0	0
Proceeds (outflows) from investment in and advances to affiliates, net	0	0	0
(Outflow) proceeds from settlement of undesignated derivative instruments, net	1	15	(13)
Net cash used in investing activities	(96)	(187)	(286)
Proceeds from issuance of debt
— third parties	47	22	141
— related parties	3	56	0
Principal payments
— third parties	(37)	(2)	0
— related parties	0		0
Short-term borrowings, net
— third parties	36	2	0
— related parties	0	0	(17)
Return of capital to our common shareholder	0		44
Intercompany return of capital	13	(3)
Dividends, noncontrolling interests and intercompany	(2)	(89)	(81)
Acquisition of noncontrolling interest in Novelis Korea Ltd.			0
Debt issuance costs	0	0	0
Net cash (used in) provided by financing activities	60	(14)	87
Net increase (decrease) in cash and cash equivalents	125	32	3
Effect of exchange rate changes on cash	1	0	2
Cash and cash equivalents — beginning of period	133	101	96
Cash and cash equivalents — end of period	259	133	101
Eliminations [Member]
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities	(245)	(568)	(316)
INVESTING ACTIVITIES
Capital expenditures	0	0	0
Proceeds from sales of assets, net - third parties	0	0	0
Proceeds from the sale of assets, net - related parties		0	0
Proceeds (outflows) from investment in and advances to affiliates, net	(275)	286	336
(Outflow) proceeds from settlement of undesignated derivative instruments, net	0	0	0
Net cash used in investing activities	(275)	286	336
Proceeds from issuance of debt
— third parties	0	0	0
— related parties	(503)	(56)	(58)
Principal payments
— third parties	0	0	0
— related parties	80		26
Short-term borrowings, net
— third parties	0	0	0
— related parties	711	(233)	(259)
Return of capital to our common shareholder	0		(45)
Intercompany return of capital	(13)	3
Dividends, noncontrolling interests and intercompany	245	568	316
Acquisition of noncontrolling interest in Novelis Korea Ltd.			0
Debt issuance costs	0	0	0
Net cash (used in) provided by financing activities	520	282	(20)
Net increase (decrease) in cash and cash equivalents	0	0	0
Effect of exchange rate changes on cash	0	0	0
Cash and cash equivalents — beginning of period	0	0	0
Cash and cash equivalents — end of period	$ 0	$ 0	$ 0

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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The net cash outflow or inflow from derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments.

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Cash outflow to owners or shareholders, excluding ordinary dividends. Includes special dividends.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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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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The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates.

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The cash outflow for the payment of a long-term borrowing made from a related party where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Payments for Advances from Affiliates.

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