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Basis of Presentation - Additional Information (Detail) ¥ in Billions, $ in Billions	9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2018 CNY (¥)	Sep. 28, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net assets of VIEs	$ 1.4	¥ 9.6
Creditors of the VIEs'third-party liabilities with no recourse to the general credit of the primary beneficiaries	No
Exchange rate used for conversion of financial statements from RMB to US dollar			6.8680

X

- Definition

Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521

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- Definition

The net carrying amount of the consolidated Variable Interest Entity's assets and liabilities included in the reporting entity's statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5710-111685

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- Definition

A statement by the reporting entity that the creditors (or beneficial interest holders) of the consolidated Variable Interest Entity (VIE) have no recourse to the general credit of the primary beneficiary.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
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