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Other comprehensive income (Details) ¥ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)
Composition of accumulated other comprehensive income/(loss)
Balance	¥ 204,486		¥ 84,660	¥ 60,867
Balance	245,572	$ 38,535	204,486	84,660
Foreign currency translation adjustments
Composition of accumulated other comprehensive income/(loss)
Balance	(3,548)		4,108	3,358
Other comprehensive income/(loss)	(2,542)		(7,656)	750
Balance	(6,090)		(3,548)	4,108
Net unrealized gains/(losses) on available-for-sale securities
Composition of accumulated other comprehensive income/(loss)
Balance			55	1
Other comprehensive income/(loss)			(55)	54
Balance				55
Accumulated other comprehensive income/(loss)
Composition of accumulated other comprehensive income/(loss)
Balance	(3,548)		4,163	3,359
Other comprehensive income/(loss)	(2,542)		(7,711)	804
Balance	¥ (6,090)		¥ (3,548)	¥ 4,163

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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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