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Equity securities and other investments (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Equity securities and other investments and fair value disclosure      
Original cost ¥ 268,182 ¥ 230,848  
Cumulative net gains (losses) (17,553) 1,436  
Carrying value 250,629 232,284  
Net unrealized gains (losses) recognized during the period for equity securities still held as of the end of the period (29,481) (25,587) ¥ 45,139
Investments in privately held companies recorded using measurement alternative 79,545 99,270  
Cumulative upward adjustments 17,782 26,759  
Cumulative impairments and downward adjustments 26,922 27,827  
Upward adjustments 4,205 19,159  
Impairments and downward adjustments 13,266 7,603  
Debt securities, Held-to-maturity, allowance for credit loss 4,085 4,336  
Shareholder of an equity method investee with principal amount 4,931    
Fair value of collateral 3,574    
Impairment losses on debt investments (356) 3,225 175
Listed equity securities      
Equity securities and other investments and fair value disclosure      
Original cost 107,535 93,599  
Cumulative net gains (losses) 216 9,661  
Carrying value 107,751 103,260  
Investments in privately held companies      
Equity securities and other investments and fair value disclosure      
Original cost 97,701 110,096  
Cumulative net gains (losses) (10,664) (859)  
Carrying value 87,037 109,237  
Debt investments | Debt securities and loan investments      
Equity securities and other investments and fair value disclosure      
Original cost 22,210 27,153  
Cumulative net gains (losses) (7,105) (7,366)  
Carrying value 15,105 19,787  
Debt investments | Other Treasury Investments      
Equity securities and other investments and fair value disclosure      
Original cost 40,736    
Cumulative net gains (losses) 0    
Carrying value 40,736    
Convertible and exchangeable bonds      
Equity securities and other investments and fair value disclosure      
Debt investments 7,167 8,339  
Aggregate fair value was (lower) higher than their aggregate unpaid principal balance 2,993 3,248  
Unrealized gains (losses) recorded ¥ (262) ¥ (3,112) ¥ 1,573