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Other comprehensive income (Details) ¥ in Thousands, $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 CNY (¥) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 CNY (¥)
Composition of accumulated other comprehensive income/(loss) |  |  |
Balance, beginning of the year | ¥ 59,770,973 |  |
Cumulative effect of changes in accounting principles related to financial instruments |  |  | ¥ 295,965
Balance, end of the year | 75,894,872 | $ 10,618,083 |
Foreign currency translation adjustments |  |  |
Composition of accumulated other comprehensive income/(loss) |  |  |
Balance, beginning of the year | 3,358,469 |  | 661,685
Cumulative effect of changes in accounting principles related to financial instruments |  |  |
Other comprehensive income/(loss) | 1,523,784 |  | 2,768,935
Balance, end of the year | 4,882,253 |  | 3,430,620
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
Cumulative effect of changes in accounting principles related to financial instruments |  |  | (1,156,642)
Other comprehensive income/(loss) | 37,583 |  | (21,076)
Balance, end of the year | 38,210 |  | 2,678
Accumulated other comprehensive income/(loss) |  |  |
Composition of accumulated other comprehensive income/(loss) |  |  |
Balance, beginning of the year | 3,359,096 |  | 1,842,081
Cumulative effect of changes in accounting principles related to financial instruments |  |  | (1,156,642)
Other comprehensive income/(loss) | 1,561,367 |  | 2,747,859
Balance, end of the year | ¥ 4,920,463 |  | ¥ 3,433,298

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