Amount appropriated to the enterprise expansion fund and staff welfare and bonus fund for entities incorporated in PRC.

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Amount appropriated from retained earnings to statutory reserves for entities incorporated in PRC.

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Represents the minimum percentage of net income from subsidiaries required to be appropriated towards the statutory reserve fund for entities incorporated in the People's Republic of China until the reserve balance reaches 50 percent of registered capital.

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Percentage derived by dividing the results of the hedging instrument by the results of the hedged item, determining effective hedging relationship.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods; total amount due to the entity from outside sources, including trade accounts receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods; total amount due to the entity, and amount of other assets that are expected to be realized or consumed after one year or the normal operating cycle, if longer.

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Represents the level of the statutory reserve fund balance as a percentage of registered capital for entities incorporated in the People's Republic of China which must be attained before mandatory transfers to the reserve are no longer required.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The net gain (loss) during the reporting period due to ineffectiveness in interest rate cash flow hedges. Recognized in earnings.

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The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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Fair value of all derivative liabilities designated as hedges of net investment in foreign operations.

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Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

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Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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Summary of significant accounting policies- Others (Details) $ in Millions	12 Months Ended
	Mar. 31, 2017 USD ($) shares	Mar. 31, 2017 CNY (¥)	Mar. 31, 2016 USD ($) shares	Mar. 31, 2016 CNY (¥)	Mar. 31, 2015 CNY (¥)	Mar. 31, 2017 CNY (¥) shares	Mar. 31, 2016 CNY (¥) shares
Bank borrowing and unsecured senior notes
Reduction to current prepayments, receivables and other assets	$ (4,127)					¥ (28,408,000,000)	¥ (16,542,000,000)
Reduction to non-current prepayments, receivables and other assets	(1,264)					(8,703,000,000)	(6,288,000,000)
Reduction to non-current unsecured senior notes	$ (6,665)					¥ (45,876,000,000)	(51,391,000,000)
Statutory reserves
Percentage of after-tax profit from subsidiaries incorporated in the PRC required to be appropriated to the statutory reserves	10.00%	10.00%
Limit of statutory reserve fund as a percentage of registered capital, after which allocations to statutory reserve fund are no longer required	50.00%	50.00%
Adjustment \| Accounting Standards Update 2015-03
Bank borrowing and unsecured senior notes
Reduction to current prepayments, receivables and other assets							35,000,000
Reduction to non-current prepayments, receivables and other assets							170,000,000
Reduction to non-current unsecured senior notes							¥ 205,000,000
PRC
Statutory reserves
Appropriation to statutory reserves		¥ 836,000,000		¥ 529,000,000	¥ 267,000,000
Appropriation to the enterprise expansion fund and staff welfare and bonus fund		¥ 0		0	0
Share repurchase for purpose of certain equity investment plans for management
Treasury shares
Number of ordinary shares included in treasury shares account \| shares	20,789,596		24,393,569			20,789,596	24,393,569
Company's share of an equity method investee's investment in the Company
Treasury shares
Number of ordinary shares included in treasury shares account \| shares	5,262,306		0			5,262,306	0
Minimum
Derivatives and hedging
Ratio determining effective hedging relationship	80.00%	80.00%
Maximum
Derivatives and hedging
Ratio determining effective hedging relationship	125.00%	125.00%
Interest rate swaps
Derivatives and hedging
Loss related to the ineffective portion of fair value change of the interest rate swaps designated and qualified as cash flow hedges		¥ 0		0	43,000,000
Loss recorded in consolidated income statements upon termination of the interest rate swap contracts		0		0	¥ 59,000,000
Foreign exchange contracts
Derivatives and hedging
Fair value amount of qualified and designated as hedging instruments	$ 3		$ 40			¥ 20,000,000	¥ 257,000,000
Loss recognized in other income, net	$ 5	¥ 35,000,000	$ 46	¥ 298,000,000