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Investment securities and fair value disclosure (Details) - CNY (¥) | 12 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Held-to-maturity investment securities |  |  |
Original cost | ¥ 1,384,000,000 | ¥ 1,229,000,000 |
Fair value | 1,384,000,000 | 1,229,000,000 |
Convertible bond accounted for under the fair value option |  |  |
Cost of convertible bond accounted for under the fair value option | 3,983,000,000 | 1,044,000,000 |
Gross unrealized gains | 150,000,000 |  |
Gross unrealized losses | (414,000,000) |  |
Fair value of convertible bond accounted for under the fair value option | 3,719,000,000 | 1,044,000,000 |
Total investment securities |  |  |
Original cost | 14,517,000,000 | 4,001,000,000 |
Gross unrealized gains | 4,671,000,000 | 529,000,000 |
Gross unrealized losses | (919,000,000) | (65,000,000) |
Fair value | 18,269,000,000 | 4,465,000,000 |
Gross realized gain | 141,000,000 | 148,000,000 | ¥ 198,000,000
Gross realized loss | 97,000,000 | 160,000,000 | 145,000,000
Impairment loss charged as a result of other than temporary decline in value | 0 | 0 | 0
Net unrealized gains on available-for-sale investment securities recorded in accumulated other comprehensive income | 3,384,000,000 | 299,000,000 | ¥ 0
Aggregate fair values of investment securities in continuous unrealized loss position | 4,929,000,000 | 0 |
Listed equity securities |  |  |
Trading securities |  |  |
Original cost | 619,000,000 | 624,000,000 |
Gross unrealized gains | 115,000,000 | 105,000,000 |
Gross unrealized losses | (58,000,000) | (61,000,000) |
Fair value | 676,000,000 | 668,000,000 |
Available-for-sale securities |  |  |
Original cost |  | 890,000,000 |
Gross unrealized gains |  | 299,000,000 |
Fair value |  | 1,189,000,000 |
Financial derivatives |  |  |
Trading securities |  |  |
Original cost | 86,000,000 | 31,000,000 |
Gross unrealized gains | 532,000,000 | 107,000,000 |
Gross unrealized losses | (1,000,000) | (4,000,000) |
Fair value | 617,000,000 | 134,000,000 |
Listed equity securities and other treasury investments |  |  |
Available-for-sale securities |  |  |
Original cost | 8,261,000,000 |  |
Gross unrealized gains | 3,822,000,000 |  |
Gross unrealized losses | (446,000,000) |  |
Fair value | 11,637,000,000 |  |
Equity fund |  |  |
Trading securities |  |  |
Original cost |  | 183,000,000 |
Gross unrealized gains |  | 18,000,000 |
Fair value |  | ¥ 201,000,000 |
Available-for-sale securities |  |  |
Original cost | 184,000,000 |  |
Gross unrealized gains | 52,000,000 |  |
Fair value | ¥ 236,000,000 |  |

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