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Investment - Schedule of Investments Accounted for at Fair Value (Detail) - Long-term investments
¥ in Millions, $ in Millions
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Amortized cost, Gain (loss) and Fair value on Investments [Line Items]      
Available-for-sale debt investments, fair value ¥ 3,682 $ 519 ¥ 2,447
Investments accounted for at fair value, fair value 4,841 682 4,616
Corporate Debt Securities      
Amortized cost, Gain (loss) and Fair value on Investments [Line Items]      
Available-for-sale debt investments, Cost or Amortized cost less allowance for credit losses 4,360   3,735
Available-for-sale debt investments, gross unrealized gains 455   283
Available-for-sale debt investments, gross unrealized losses (1,133)   (1,571)
Available-for-sale debt investments, fair value 3,682 519 2,447
Investments accounted for at fair value, cost or amortized cost 2,547   2,331
Investments accounted for at fair value, gross unrealized gains 2,942   2,855
Investments accounted for at fair value, gross unrealized Losses (648)   (570)
Investments accounted for at fair value, fair value 4,841 682 4,616
Ordinary Shares      
Amortized cost, Gain (loss) and Fair value on Investments [Line Items]      
Equity investments at fair value with readily determinable fair value, cost or amortized cost 14,716   15,835
Equity investments at fair value with readily determinable fair value, gross unrealized gains 1,698   2,731
Equity investments at fair value with readily determinable fair value, gross unrealized loss (6,804)   (6,466)
Equity investments at fair value with readily determinable fair value, fair value ¥ 9,610 $ 1,354 ¥ 12,100