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Other comprehensive income/(loss) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Composition of accumulated other comprehensive income/(loss) |  |  |  |
Balance, beginning of the year |  | ¥ 33,892,900 |  |
Other comprehensive income/(loss) |  | 298,688 | ¥ 988,567 | ¥ 930,951
Balance, end of the year | $ 7,998,527 | 52,040,814 | 33,892,900 |
Foreign currency translation adjustments |  |  |  |
Composition of accumulated other comprehensive income/(loss) |  |  |  |
Balance, beginning of the year |  | 1,483,737 | 540,121 | (413,452)
Other comprehensive income/(loss) |  | (822,052) | 943,616 | 953,573
Balance, end of the year |  | 661,685 | 1,483,737 | 540,121
Net unrealized gains/(losses) on available-for-sale securities |  |  |  |
Composition of accumulated other comprehensive income/(loss) |  |  |  |
Balance, beginning of the year |  | 59,656 | 14,705 | 37,327
Other comprehensive income/(loss) |  | 1,120,740 | 44,951 | (22,622)
Balance, end of the year |  | 1,180,396 | 59,656 | 14,705
Accumulated other comprehensive loss |  |  |  |
Composition of accumulated other comprehensive income/(loss) |  |  |  |
Balance, beginning of the year |  | 1,543,393 | 554,826 | (376,125)
Balance, end of the year |  | ¥ 1,842,081 | ¥ 1,543,393 | ¥ 554,826

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