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This item represents the difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee allocated to deferred income taxes.

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Equity method investment difference between carrying amount and underlying equity allocation to goodwill increase decrease.

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Number of directors.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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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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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Fair value portion of investments accounted under the equity method.

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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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The cash inflow associated with the sale of 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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Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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Investments - Long-term Investments - Additional information (Detail) ¥ in Millions, shares in Millions, $ in Millions	1 Months Ended		3 Months Ended	12 Months Ended
	Oct. 31, 2019 USD ($) shares	Aug. 31, 2018 CNY (¥)	Sep. 30, 2019 CNY (¥)	Dec. 31, 2022 CNY (¥) Directors	Dec. 31, 2022 USD ($) Directors	Dec. 31, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2018
Schedule of Investments [Line Items]
Impairment charges recognized on equity investments measured at fair value using the measurement alternative				¥ 2,456	$ 356	¥ 4,259	¥ 2,310
Impairment recognized for equity method investments				569	82	57	297
Carrying amount of equity method investments				25,900		24,800			$ 3,800
Payment to acquire equity investments without readily determinable fair value				3,628	$ 526	¥ 3,395	¥ 4,467
Trip.com International, Ltd
Schedule of Investments [Line Items]
Percentage Of equity interest held by company								12.00%		19.00%
Fair value of equity investment				¥ 16,400					$ 2,400
Gains (losses) on equity method investments								¥ 43
Impairment recognized for equity method investments			¥ 8,900
Equity method investment, disposal of ADS \| shares	36
Proceeds From sale of equity investments \| $	$ 988
Adjustments to goodwill acquired			¥ 8,900
Number of directors \| Directors				9	9
Trip.com International, Ltd \| Active directors
Schedule of Investments [Line Items]
Number of directors \| Directors				2	2
Jidu Auto Inc [Member]
Schedule of Investments [Line Items]
Payment to acquire equity method investments \| $					$ 371
Payment to acquire equity investments without readily determinable fair value \| $					193
Jidu Auto Inc [Member] \| Common Stock [Member]
Schedule of Investments [Line Items]
Payment to acquire equity method investments \| $					171
Jidu Auto Inc [Member] \| In Substance Common Stock [Member]
Schedule of Investments [Line Items]
Payment to acquire equity method investments \| $					$ 200
Jidu Auto Inc [Member] \| Equity Investment
Schedule of Investments [Line Items]
Percentage Of equity interest held by company				52.30%					52.30%
Du Xiaoman Financial
Schedule of Investments [Line Items]
Equity interest percentage		41.00%
Equity method goodwill		¥ 3,500
Intangible assets		851
Deferred tax liabilities		¥ 213