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Summary of Redeemable Noncontrolling Interest (Detail) ¥ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Temporary Equity Disclosure [Abstract]
Balance as of January 1	$ 844	¥ 5,492	¥ 3,948	¥ 1,895
Other comprehensive income (loss)	(51)	(335)	325	142
Issuance of subsidiary shares	0	0	662	1,582
Disposal of subsidiary shares	(365)	(2,376)	0	0
Accretion of redeemable noncontrolling interests	(3)	(17)	557	329
Conversion of convertible notes of a subsidiary	1,269	8,258	0	0
Balance as of December 31	$ 1,694	¥ 11,022	¥ 5,492	¥ 3,948

X

- Definition

Increase decrease in temporary equity redemption value.

+ References

No definition available.

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X

- Definition

Temporary equity conversion of convertible notes of subsidiary.

+ References

No definition available.

+ Details

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X

- Definition

Adjustments to temporary equity resulting from disposal of subsidiary shares.

+ References

No definition available.

+ Details

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X

- Definition

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph (12)(c)
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph (16)(c)
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph 15
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph 14
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

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- References

No definition available.

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X

- Definition

Adjustments to temporary equity resulting from foreign currency translation adjustments.

+ References

No definition available.

+ Details

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X

- Definition

Value of new stock classified as temporary equity issued during the period.

+ References

No definition available.

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