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Related Party Transactions - Additional Information (Detail) ¥ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 USD ($)
Trip.com International, Ltd
Related Party Transaction [Line Items]
Related party transactions	¥ 627	$ 90	¥ 774	¥ 750
Du Xiaoman
Related Party Transaction [Line Items]
Related party transactions	731	105	256
Hardware Goods [Member]
Related Party Transaction [Line Items]
Purchases from related party	1,900	276	102		$ 0
Sales from related party	¥ 249	$ 36	¥ 77		$ 0

X

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

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-SubTopic 10
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+ References

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

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