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Other comprehensive income/(loss) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
Composition of accumulated other comprehensive income/(loss) |  |  |  |
Balance, beginning of the year |  | ¥ 52,040,814 |  |
Cumulative effect of changes in accounting principles related to financial instruments |  | 295,965 |  |
Other comprehensive income/(loss) |  | 2,673,657 | ¥ 298,688 | ¥ 988,567
Balance, end of the year | $ 8,693,326 | 59,770,973 | 52,040,814 |
Foreign currency translation adjustments |  |  |  |
Composition of accumulated other comprehensive income/(loss) |  |  |  |
Balance, beginning of the year |  | 661,685 | 1,483,737 | 540,121
Other comprehensive income/(loss) |  | 2,696,784 | (822,052) | 943,616
Balance, end of the year |  | 3,358,469 | 661,685 | 1,483,737
Net unrealized gains/(losses) on available-for-sale securities |  |  |  |
Composition of accumulated other comprehensive income/(loss) |  |  |  |
Balance, beginning of the year |  | 1,180,396 | 59,656 | 14,705
Cumulative effect of changes in accounting principles related to financial instruments |  | (1,156,642) |  |
Other comprehensive income/(loss) |  | (23,127) | 1,120,740 | 44,951
Balance, end of the year |  | 627 | 1,180,396 | 59,656
Accumulated other comprehensive income/(loss) |  |  |  |
Composition of accumulated other comprehensive income/(loss) |  |  |  |
Balance, beginning of the year |  | 1,842,081 | 1,543,393 | 554,826
Cumulative effect of changes in accounting principles related to financial instruments |  | (1,156,642) |  |
Balance, end of the year |  | ¥ 3,359,096 | ¥ 1,842,081 | ¥ 1,543,393

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