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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, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥)
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Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |
Held-to-maturity debt investments, fair value | ¥ 167,740 | $ 23,626 | ¥ 120,464
Available-for-sale debt investments, fair value | 1,671 | 235 | 855
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 | 166,999 |  | 119,984
Held-to-maturity debt investments, gross unrecognized holding gains | 835 |  | 631
Held-to-maturity debt investments, fair value | 167,740 | 23,626 | 120,464
Available-for-sale debt investments, Cost or Amortized cost less allowance for credit losses | 1,642 |  | 847
Gross unrecognized holding losses | (94) |  | (151)
Available-for-sale debt investments, gross unrealized gains | 29 |  | 8
Available-for-sale debt investments, fair value | ¥ 1,671 | $ 235 | ¥ 855

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