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Investment securities and fair value disclosure- Cost to fair value (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Held-to-maturity securities      
Original cost, Total ¥ 12,642 ¥ 12,241  
Provision for decline in value (179) (180)  
Fair value 12,463 12,061  
Investment securities accounted for under the fair value option      
Original cost 1,754 183  
Gross unrealized gains 67    
Fair value 1,821 183  
Total investment securities      
Original cost 34,699 27,749  
Gross unrealized gains 11,057 9,792  
Gross unrealized losses (1,587) (836)  
Provision for decline in value (1,162) (1,199)  
Fair value 43,007 35,506  
Gross realized gains 0 6,306 ¥ 1,012
Gross realized losses 0 534 410
Impairment losses charged in interest and investment income as a result of other than temporary decline in value 63 173 962
Net unrealized gains on available-for-sale investment securities recorded in accumulated other comprehensive income 9,403 8,956 5,502
Aggregate fair values of investment securities in continuous unrealized losses position 7,636 4,366 ¥ 1,751
Listed equity securities      
Available-for-sale securities      
Original cost 20,303 15,325  
Gross unrealized gains 10,990 9,792  
Gross unrealized losses (1,587) (836)  
Provision for decline in value (983) (1,019)  
Fair value ¥ 28,723 ¥ 23,262