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Leases -Summary of Supplemental cash flow information (Detail) ¥ in Millions, $ in Millions		6 Months Ended
		Jun. 30, 2020 CNY (¥)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 CNY (¥)
Leases [Abstract]
Operating lease cost	[1]	¥ 1,393	$ 197	¥ 1,256
Cash payments for operating leases		1,411	200	1,040
ROU assets obtained in exchange for operating lease liabilities		¥ 1,204	$ 170	¥ 2,017
[1] Excluding cost of short-term contracts.

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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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-Subparagraph (c)
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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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