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Other comprehensive income (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Composition of accumulated other comprehensive income/(loss) |  |  |  |
Balance, beginning of the year |  | ¥ 59,770,973 | ¥ 52,040,814 |
Cumulative effect of changes in accounting principles related to financial instruments |  |  | 295,965 |
Balance, end of the year | $ 11,757,875 | 81,855,970 | 59,770,973 | ¥ 52,040,814
Foreign currency translation adjustments |  |  |  |
Composition of accumulated other comprehensive income/(loss) |  |  |  |
Balance, beginning of the year |  | 3,358,469 | 661,685 | 1,483,737
Other comprehensive income/(loss) |  | 749,865 | 2,696,784 | (822,052)
Balance, end of the year |  | 4,108,334 | 3,358,469 | 661,685
Net unrealized gains/(losses) on available-for-sale securities |  |  |  |
Composition of accumulated other comprehensive income/(loss) |  |  |  |
Balance, beginning of the year |  | 627 | 1,180,396 | 59,656
Cumulative effect of changes in accounting principles related to financial instruments |  |  | (1,156,642) |
Other comprehensive income/(loss) |  | 54,186 | (23,127) | 1,120,740
Balance, end of the year |  | 54,813 | 627 | 1,180,396
Accumulated other comprehensive income/(loss) |  |  |  |
Composition of accumulated other comprehensive income/(loss) |  |  |  |
Balance, beginning of the year |  | 3,359,096 | 1,842,081 | 1,543,393
Cumulative effect of changes in accounting principles related to financial instruments |  |  | (1,156,642) |
Other comprehensive income/(loss) |  | 804,051 | 2,673,657 | 298,688
Balance, end of the year |  | ¥ 4,163,147 | ¥ 3,359,096 | ¥ 1,842,081

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