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Business Combination - Additional Information (Detail) ¥ in Millions, $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 CNY (¥) | Sep. 30, 2017 CNY (¥) | Sep. 30, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition, total purchase consideration | $ 353 | ¥ 2,400 | ¥ 721 |  |
Business acquisition, goodwill | 2,483 |  |  | ¥ 17,051 | ¥ 15,806
Business acquisition, intangible assets | 139 |  |  | 958 |
Business acquisition, net assets other than goodwill and intangible assets | 73 |  |  | 491 |
Business acquisition, attribute to noncontrolling interest | 130 |  |  | 889 |
Cash paid for business combination | 192 | ¥ 1,300 |  |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition, goodwill | $ 271 |  |  | ¥ 1,900 |

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- Definition This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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