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Other comprehensive income/(loss) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Composition of accumulated other comprehensive income/(loss)
Balance, beginning of the year		¥ 33,892,900
Other comprehensive income/(loss)		298,688	¥ 988,567	¥ 930,951
Balance, end of the year	$ 7,998,527	52,040,814	33,892,900
Foreign currency translation adjustments
Composition of accumulated other comprehensive income/(loss)
Balance, beginning of the year		1,483,737	540,121	(413,452)
Other comprehensive income/(loss)		(822,052)	943,616	953,573
Balance, end of the year		661,685	1,483,737	540,121
Net unrealized gains/(losses) on available-for-sale securities
Composition of accumulated other comprehensive income/(loss)
Balance, beginning of the year		59,656	14,705	37,327
Other comprehensive income/(loss)		1,120,740	44,951	(22,622)
Balance, end of the year		1,180,396	59,656	14,705
Accumulated other comprehensive loss
Composition of accumulated other comprehensive income/(loss)
Balance, beginning of the year		1,543,393	554,826	(376,125)
Balance, end of the year		¥ 1,842,081	¥ 1,543,393	¥ 554,826

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(3)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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