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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 (¥)
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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Schedule Of Amortized Cost Gain Loss And Fair Value On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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