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Investments - Short-term Investments - Additional information (Detail) ¥ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Schedule of Investments [Line Items]
Investment interest income	$ 485	¥ 3,154	¥ 2,342	¥ 2,362
Short-term Investments
Schedule of Investments [Line Items]
Investment interest income	$ 455	¥ 3,000	¥ 2,300	¥ 2,200
Short-term Investments | Maximum
Schedule of Investments [Line Items]
Short-term held-to-maturity debt investments maturity	1 year	1 year
Short-term available-for-sale debt investments maturity	1 year	1 year

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The maturity term of available-for-sale investments.

+ References

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The maturity term of held-to-maturity debt investments.

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- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(b))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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