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Investment - Schedule of Short-term Investments at Amortized Cost and Fair Value (Detail) - Short-term Investments
¥ in Millions, $ in Millions
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Amortized cost, Gain (loss) and Fair value on Investments [Line Items]      
Held-to-maturity debt investments, fair value ¥ 96,912 $ 13,277 ¥ 167,740
Available-for-sale debt investments, fair value 5,954 816 1,671
Trading debt investments, Cost or amortized cost less allowance for credit losses 15 2  
Corporate Debt Securities      
Amortized cost, Gain (loss) and Fair value on Investments [Line Items]      
Held-to-maturity debt investments, Cost or amortized cost less allowance for credit losses 96,639   166,999
Held-to-maturity debt investments, gross unrecognized holding gains 370   835
Held-to-maturity debt investments, fair value 96,912 13,277 167,740
Available-for-sale debt investments, Cost or amortized cost less allowance for credit losses 5,912   1,642
Held-to-maturity debt investments, Gross unrecognized holding losses (97)   (94)
Available-for-sale debt investments, gross unrealized gains 42   29
Available-for-sale debt investments, fair value 5,954 816 ¥ 1,671
Trading debt investments, Cost or amortized cost less allowance for credit losses 15    
Trading debt investments, Fair value ¥ 15 $ 2