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Equity securities and other investments (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Equity securities and other investments and fair value disclosure      
Original cost ¥ 230,848 ¥ 212,906  
Cumulative net gains (losses) 1,436 34,122  
Carrying value 232,284 247,028  
Net unrealized gains (losses) recognized during the period for equity securities still held as of the end of the period (25,587) 45,139 ¥ (15,264)
Investments in privately held companies recorded using measurement alternative 99,270 96,946  
Cumulative upward adjustments 26,759 16,351  
Cumulative impairments and downward adjustments 27,827 24,008  
Upward adjustments 19,159 6,061  
Impairments and downward adjustments 7,603 8,042  
Debt securities, Held-to-maturity, allowance for credit loss 4,336 1,110  
Impairment losses on debt investments 3,225 175 890
Listed equity securities      
Equity securities and other investments and fair value disclosure      
Original cost 93,599 83,099  
Cumulative net gains (losses) 9,661 41,742  
Carrying value 103,260 124,841  
Investments in privately held companies      
Equity securities and other investments and fair value disclosure      
Original cost 110,096 107,395  
Cumulative net gains (losses) (859) (6,708)  
Carrying value 109,237 100,687  
Debt investments      
Equity securities and other investments and fair value disclosure      
Original cost 27,153 22,412  
Cumulative net gains (losses) (7,366) (912)  
Carrying value 19,787 21,500  
Convertible and exchangeable bonds      
Equity securities and other investments and fair value disclosure      
Debt investments 8,339 11,343  
Aggregate fair value was (lower) higher than their aggregate unpaid principal balance (3,248) 90  
Unrealized gains (losses) recorded ¥ (3,112) ¥ 1,573 ¥ (1,651)