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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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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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