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Investment securities and fair value disclosure- Cost to fair value (Details) - CNY (¥) | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Held-to-maturity securities |  |  |
Original cost, Total | ¥ 12,241,000,000 | ¥ 10,760,000,000 |
Provision for decline in value | (180,000,000) | (7,000,000) |
Fair value | 12,061,000,000 | 10,753,000,000 |
Investment securities accounted for under the fair value option |  |  |
Original cost | 183,000,000 | 4,256,000,000 |
Gross unrealized gains |  | 366,000,000 |
Fair value | 183,000,000 | 4,622,000,000 |
Total investment securities |  |  |
Original cost | 27,749,000,000 | 28,370,000,000 |
Gross unrealized gains | 9,792,000,000 | 6,707,000,000 |
Gross unrealized losses | (836,000,000) | (543,000,000) |
Provision for decline in value | (1,199,000,000) | (964,000,000) |
Fair value | 35,506,000,000 | 33,570,000,000 |
Gross realized gains | 6,306,000,000 | 1,012,000,000 | ¥ 141,000,000
Gross realized losses | 534,000,000 | 410,000,000 | 97,000,000
Impairment losses charged in interest and investment income as a result of other than temporary decline in value | 173,000,000 | 962,000,000 | 0
Net unrealized gains on available-for-sale investment securities recorded in accumulated other comprehensive income | 8,956,000,000 | 5,502,000,000 | 3,384,000,000
Aggregate fair values of investment securities in continuous unrealized losses position | 4,366,000,000 | 1,751,000,000 | ¥ 4,929,000,000
Listed equity securities |  |  |
Trading securities |  |  |
Original cost, Total |  | 646,000,000 |
Gross unrealized gains |  | 230,000,000 |
Gross unrealized losses |  | (105,000,000) |
Fair value |  | 771,000,000 |
Available-for-sale securities |  |  |
Original cost | 15,325,000,000 |  |
Gross unrealized gains | 9,792,000,000 |  |
Gross unrealized losses | (836,000,000) |  |
Provision for decline in value | (1,019,000,000) |  |
Fair value | ¥ 23,262,000,000 |  |
Financial derivatives |  |  |
Trading securities |  |  |
Original cost, Total |  | 7,000,000 |
Gross unrealized gains |  | 171,000,000 |
Fair value |  | 178,000,000 |
Listed equity securities and other treasury investments |  |  |
Available-for-sale securities |  |  |
Original cost |  | 12,701,000,000 |
Gross unrealized gains |  | 5,940,000,000 |
Gross unrealized losses |  | (438,000,000) |
Provision for decline in value |  | (957,000,000) |
Fair value |  | ¥ 17,246,000,000 |

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