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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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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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