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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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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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