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Investment securities and fair value disclosure- Cost to fair value (Details) - CNY (¥)
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Held-to-maturity securities      
Original cost ¥ 10,760,000,000 ¥ 1,384,000,000  
Provision for decline in value (7,000,000)    
Fair value 10,753,000,000 1,384,000,000  
Convertible bond accounted for under the fair value option      
Cost of convertible bond accounted for under the fair value option 4,256,000,000 3,983,000,000  
Gross unrealized gains 366,000,000 150,000,000  
Gross unrealized losses   (414,000,000)  
Fair value of convertible bond accounted for under the fair value option 4,622,000,000 3,719,000,000  
Total investment securities      
Original cost 28,370,000,000 14,517,000,000  
Gross unrealized gains 6,707,000,000 4,671,000,000  
Gross unrealized losses (543,000,000) (919,000,000)  
Provision for decline in value (964,000,000)    
Fair value 33,570,000,000 18,269,000,000  
Gross realized gain 1,012,000,000 141,000,000 ¥ 148,000,000
Gross realized loss 410,000,000 97,000,000 160,000,000
Impairment loss charged as a result of other than temporary decline in value 962,000,000 0 0
Net unrealized gains on available-for-sale investment securities recorded in accumulated other comprehensive income 5,502,000,000 3,384,000,000 ¥ 299,000,000
Aggregate fair values of investment securities in continuous unrealized loss position 1,751,000,000 4,929,000,000  
Listed equity securities      
Trading securities      
Original cost 646,000,000 619,000,000  
Gross unrealized gains 230,000,000 115,000,000  
Gross unrealized losses (105,000,000) (58,000,000)  
Fair value 771,000,000 676,000,000  
Financial derivatives      
Trading securities      
Original cost 7,000,000 86,000,000  
Gross unrealized gains 171,000,000 532,000,000  
Gross unrealized losses   (1,000,000)  
Fair value 178,000,000 617,000,000  
Listed equity securities and other treasury investments      
Available-for-sale securities      
Original cost 12,701,000,000 8,261,000,000  
Gross unrealized gains 5,940,000,000 3,822,000,000  
Gross unrealized losses (438,000,000) (446,000,000)  
Provision for decline in value (957,000,000)    
Fair value ¥ 17,246,000,000 11,637,000,000  
Equity fund      
Available-for-sale securities      
Original cost   184,000,000  
Gross unrealized gains   52,000,000  
Fair value   ¥ 236,000,000