Fixed Assets - Additional Information (Detail) $ in Millions, ¥ in Billions	12 Months Ended
Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2022 CNY (¥)
Property, Plant and Equipment [Abstract]
Fixed assets, depreciation expense	¥ 6.6	$ 909	¥ 7.1	¥ 6.2

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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Name:	us-gaap_DepreciationDepletionAndAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration