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Fair Value Measurements - Schedule of Investments accounted at Fair Value (Detail)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax
Investment Accounted Fair Value      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Begining Balance ¥ 4,775   ¥ 4,519
Additions 159   250
Disposals (248)   (90)
Net unrealized fair value increase (decrease) recognized in earnings (376)   55
Foreign currency translation adjustments 37   41
Ending balance ¥ 4,347 $ 596 ¥ 4,775