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Summary of Estimated Fair Value of Available-For-Sale Debt Investments (Detail) ¥ in Millions, $ in Millions	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)
Investments, Debt and Equity Securities [Abstract]
Due in 1 year	¥ 1,793	$ 246	¥ 0
Due in 1 year through 5 years	870	119	2,154
Not due at a single maturity date	3,697	506	1,528
Total	¥ 6,360	$ 871	¥ 3,682

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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