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Investment securities and fair value disclosure - Rollforward of liabilities (Details) - Contingent consideration in relation to investments and acquisitions - Level 3 - CNY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Contingent consideration in relation to investments and acquisitions    
Balance at beginning ¥ 120 ¥ 921
Payment   (770)
Net decrease in fair value (45) (17)
Additions 4,790  
Foreign currency translation adjustments 257 (14)
Balance at end ¥ 5,122 ¥ 120