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Summary of Estimated Fair Values of Assets Acquired, Liabilities Assumed and Noncontrolling Interest (Detail) ¥ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2017 CNY (¥)
Business Acquisition [Line Items]
Purchase consideration	¥ 1,200	$ 168
Goodwill	18,250		¥ 18,536	$ 2,621	¥ 15,806
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Purchase consideration	1,168	$ 168	2,378
Net assets acquired, excluding intangible assets and the related deferred tax liabilities	229		1,545	33
Intangible assets, net	543		1,424	78
Deferred tax liabilities	(134)		(292)	(19)
Pre-existing equity interests			(1,651)
Noncontrolling interests	(266)		(1,312)	(38)
Redeemable non-controlling interests (Note 17)	(182)		(698)	(26)
Goodwill	978		3,362	140
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest	¥ 1,168		¥ 2,378	$ 168

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The amount of acquisition cost of a business combination allocated to assets acquired (excluding identifiable intangible assets and the related deferred tax liabilities) less liabilities assumed.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount recognized as of the acquisition date for the assets, including goodwill, in excess of (less than) the aggregate liabilities assumed, less the noncontrolling interest in the acquiree.

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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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