Investments - Short-term Investments - Additional information (Detail) ¥ in Millions, $ in Millions	12 Months Ended
Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)
Schedule of Investments [Line Items]
Investment interest income	¥ 6,245	$ 905	¥ 5,551	¥ 5,358
Short-term Investments
Schedule of Investments [Line Items]
Investment interest income	¥ 4,500	$ 647	¥ 4,500	¥ 4,700

Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(b))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration