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Investment securities and fair value disclosure- Rollforward of liabilities (Details) - Contingent consideration in relation to investments and acquisitions - CNY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Contingent consideration in relation to investments and acquisitions    
Balance at beginning ¥ 1,264 ¥ 1,278
Net decrease in fair value (642) (14)
Additions 293  
Foreign currency translation adjustment 6  
Balance at end ¥ 921 ¥ 1,264