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Other comprehensive income (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Composition of accumulated other comprehensive income/(loss)
Balance	¥ 84,659,847		¥ 60,866,860	¥ 52,388,703
Balance	204,485,908	$ 31,338,839	84,659,847	60,866,860
Foreign currency translation adjustments
Composition of accumulated other comprehensive income/(loss)
Balance	4,108,334		3,358,469	661,685
Other comprehensive income/(loss)	(7,656,413)		749,865	2,696,784
Balance	(3,548,079)		4,108,334	3,358,469
Net unrealized gains/(losses) on available-for-sale securities
Composition of accumulated other comprehensive income/(loss)
Balance	54,813		627	1,180,396
Other comprehensive income/(loss)	(54,802)		54,186	(23,127)
Balance	11		54,813	627
Net unrealized gains/(losses) on available-for-sale securities | Cumulative Effect, Period of Adoption, Adjustment [Member]
Composition of accumulated other comprehensive income/(loss)
Balance			(1,156,642)
Balance				(1,156,642)
Accumulated other comprehensive income/(loss)
Composition of accumulated other comprehensive income/(loss)
Balance	4,163,147		3,359,096	1,842,081
Other comprehensive income/(loss)	(7,711,215)		804,051	2,673,657
Balance	¥ (3,548,068)		4,163,147	3,359,096
Accumulated other comprehensive income/(loss) | Cumulative Effect, Period of Adoption, Adjustment [Member]
Composition of accumulated other comprehensive income/(loss)
Balance			¥ (1,156,642)
Balance				¥ (1,156,642)

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

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

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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