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Income tax expenses- Reconciliations (Details)
¥ / shares in Units, ¥ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2017
CNY (¥)
¥ / shares
Mar. 31, 2016
CNY (¥)
¥ / shares
Mar. 31, 2015
CNY (¥)
¥ / shares
Reconciliation of the differences between the statutory EIT rate applicable to profits of the consolidated entities and the income tax expenses of the Company        
Income before income tax and share of results of equity investees $ 8,721 ¥ 60,029 ¥ 81,468 ¥ 32,326
Income tax computed at statutory EIT rate (25%)   15,007 20,367 8,082
Effect of different tax rates available to different jurisdictions   (772) (869) 33
Effect of tax holiday and preferential tax benefit on assessable profits of subsidiaries incorporated in the PRC   (10,507) (6,680) (5,881)
Non deductible expenses and non taxable income, net   6,090 (4,994) 3,368
Tax savings from additional deductions on certain research and development expenses available for subsidiaries incorporated in the PRC   (1,694) (1,205) (1,096)
Withholding tax on the earnings remitted and anticipated to be remitted   3,009 1,573 1,898
Change in valuation allowance, deduction of certain share-based compensation expense and others   2,643 257 12
Income tax expenses $ 2,002 ¥ 13,776 ¥ 8,449 ¥ 6,416
Statutory EIT rate (as a percent) 25.00% 25.00% 25.00% 25.00%
Tax deduction, percentage of the research and development expenses incurred 50.00% 50.00% 50.00% 50.00%
PRC        
Reconciliation of the differences between the statutory EIT rate applicable to profits of the consolidated entities and the income tax expenses of the Company        
Statutory EIT rate (as a percent) 25.00% 25.00% 25.00% 25.00%
Effect of tax holidays inside the PRC on basic earnings per share/ADS (RMB) | ¥ / shares   ¥ 4.21 ¥ 2.72 ¥ 2.57