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Earnings per share/ADS (Details)
¥ / shares in Units, $ / shares in Units, ¥ in Millions, shares in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2025
CNY (¥)
¥ / shares
shares
Mar. 31, 2025
USD ($)
$ / shares
shares
Mar. 31, 2024
CNY (¥)
¥ / shares
shares
Mar. 31, 2023
CNY (¥)
¥ / shares
shares
Jul. 30, 2019
Earnings Per Share [Abstract]          
ADS ratio 8 8 8 8 8
Numerator:          
Net income attributable to ordinary shareholders for computing net income per ordinary share - basic ¥ 129,470 $ 17,841 ¥ 79,741 ¥ 72,509  
Dilution effect on earnings arising from share-based awards operated by equity method investees and subsidiaries | ¥ (300)   (228) (38)  
Adjustments for interest expense attributable to convertible unsecured senior notes | ¥ 235   0 0  
Net income attributable to ordinary shareholders for computing net income per ordinary share - diluted | ¥ ¥ 129,405   ¥ 79,513 ¥ 72,471  
Shares (denominator):          
Weighted average number of shares used in calculating net income per ordinary share - basic (million shares) 18,791 18,791 20,182 20,980  
Adjustments for dilutive RSUs and share options (million shares) 200 200 177 134  
Adjustments for convertible unsecured senior notes 327 327 0 0  
Weighted average number of shares used in calculating net income per ordinary share - diluted (million shares) 19,318 19,318 20,359 21,114  
Net income per ordinary share - basic (RMB) | (per share) ¥ 6.89 $ 0.95 ¥ 3.95 ¥ 3.46  
Net income per ordinary share - diluted (RMB) | (per share) 6.7 0.92 3.91 3.43  
Earnings per ADS          
Net income per ADS - basic (RMB) | (per share) 55.12 7.6 31.61 27.65  
Net income per ADS - diluted (RMB) | (per share) ¥ 53.59 $ 7.38 ¥ 31.24 ¥ 27.46