Principal Amount and Unamortized Discount and Debt Issuance Costs (Detail) ¥ in Millions, $ in Millions	Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥)
Debt Disclosure [Abstract]
Principal amount	¥ 46,983	$ 6,812	¥ 53,848
Unamortized discount and debt issuance costs	(186)	(27)	(223)
Long-term Debt, Total	¥ 46,797	$ 6,785	¥ 53,625

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant