Aggregate number of shares represented by aggregate ads shares.

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Modification of income loss from equity method Investments.

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Number of directors.

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Percentage of equity interest if the warrants are exercised.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Amount of other-than-temporary decline in value that has been recognized against investment accounted for under equity method of accounting.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of gain (loss) on sale or disposal of an equity method investment.

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Fair value portion of investments accounted under the equity method.

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Amount of impairment loss on investment in equity security without readily determinable fair value.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Amount of cash outflow to acquire investments classified as other.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Investments - Long-term Investments - Additional information (Detail) ¥ in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2018	Dec. 31, 2024 CNY (¥) Directors shares	Dec. 31, 2024 USD ($) shares	Dec. 31, 2023 CNY (¥) shares	Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2024 USD ($) Directors
Schedule of Investments [Line Items]
Impairment charges recognized on equity investments measured at fair value using the measurement alternative		¥ 292	$ 40	¥ 753	¥ 2,456
Impairment recognized for equity method investments		26	4	62	569
Carrying amount of equity method investments		17,500		20,800			$ 2,400
Share of losses from one of the equity method investees modified certain terms of its preferred shares \| ¥				(3,000)
Share of losses from equity method investments		(691)	(95)	(3,799)	(1,910)
Payment to acquire equity investments		¥ 795	$ 109	¥ 1,487	¥ 3,628
Trip.com International, Ltd
Schedule of Investments [Line Items]
Percentage Of equity interest held by company		7.00%		9.00%			7.00%
Fair value of equity investment		¥ 23,000					$ 3,200
Gains on equity method investments \| ¥		¥ 1,900		¥ 1,400
Equity method investment, disposal of ADS \| shares		13,000,000	13,000,000	10,000,000
Number of directors \| Directors		8					8
Trip.com International, Ltd \| Active directors
Schedule of Investments [Line Items]
Number of directors \| Directors		1					1
Jidu Auto Inc
Schedule of Investments [Line Items]
Payment to acquire equity method investments						$ 371
Payment to acquire equity investments						193
Jidu Auto Inc \| Series C Warrant
Schedule of Investments [Line Items]
Payments for purchase of warrants \| ¥				¥ 650
Jidu Auto Inc \| Series C Preferred Stock
Schedule of Investments [Line Items]
Class of warrant or right \| shares				14,443,320
Jidu Auto Inc \| Common Stock
Schedule of Investments [Line Items]
Payment to acquire equity method investments						171
Jidu Auto Inc \| In Substance Common Stock
Schedule of Investments [Line Items]
Payment to acquire equity method investments						$ 200
Jidu Auto Inc \| Equity Investment
Schedule of Investments [Line Items]
Percentage of equity interest if the warrants are exercised		51.14%					51.14%
Du Xiaoman Financial
Schedule of Investments [Line Items]
Equity interest percentage	41.00%