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Summary of significant accounting policies- Others (Details)
¥ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2019
USD ($)
shares
Mar. 31, 2019
CNY (¥)
shares
Mar. 31, 2018
CNY (¥)
shares
Mar. 31, 2017
CNY (¥)
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%    
Reclassification of comparative figures        
Impact of the retrospective reclassification on cash flows from operating activities $ 22,496 ¥ 150,975 ¥ 125,805 ¥ 82,854
Impact of the retrospective reclassification on cash flows from investing activities (22,509) (151,060) (83,764) (79,579)
Impact of the retrospective reclassification on effect of exchange rate changes $ 484 3,245 (6,065) 2,038
ASU 2016-18 | Adjustment        
Reclassification of comparative figures        
Impact of the retrospective reclassification on cash flows from operating activities     634 2,528
Impact of the retrospective reclassification on cash flows from investing activities     126 (1,215)
Impact of the retrospective reclassification on effect of exchange rate changes     2 (4)
PRC        
Statutory reserves        
Appropriation to statutory reserves   ¥ 690 ¥ 298 ¥ 836
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%    
Share repurchase for purpose of certain equity investment plans for management        
Treasury shares        
Number of ordinary shares included in treasury shares account | shares 18,737,922 18,737,922 20,789,596  
Company's share of an equity method investee's in the Company | Suning        
Treasury shares        
Number of ordinary shares included in treasury shares account | shares     4,162,856