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Investments - Long-term Investments - Additional information (Detail) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
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Aug. 31, 2018 USD ($) | Aug. 31, 2018 CNY (¥) | Jul. 31, 2018 USD ($) | Jul. 31, 2018 CNY (¥) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 CNY (¥) | Sep. 30, 2017 CNY (¥) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 CNY (¥) | Sep. 30, 2017 CNY (¥) | Sep. 30, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of cost method investments |  |  |  |  |  |  |  |  |  |  |  | ¥ 21,800,000,000
Carrying amount of equity investments without readily determinable fair value |  |  |  |  | $ 4,000,000,000 |  |  | $ 4,000,000,000 |  |  | ¥ 27,600,000,000 |
Accumulated impairment of equity investments without readily determinable fair value |  |  |  |  | 175,000,000 |  |  | 175,000,000 |  |  | 1,200,000,000 |
Equity investments measured at fair value |  |  |  |  | 609,000,000 |  |  | 609,000,000 |  |  | 4,200,000,000 |
Unrealized gains and losses recognized |  |  |  |  | 143,000,000 | ¥ 981,000,000 |  | 609,000,000 | ¥ 4,200,000,000 |  |  |
Impairment charges recognized on equity investments without readily determinable fair value |  |  |  |  | 43,000,000 | 298,000,000 |  | 51,000,000 | 348,000,000 |  |  |
Carrying amount of equity method investments |  |  |  |  | 6,500,000,000 |  |  | 6,500,000,000 |  |  | ¥ 44,700,000,000 | ¥ 31,400,000,000
Impairment recognized for equity method investments |  |  |  |  | $ 0 | ¥ 0 | ¥ 0 | $ 7,000,000 | ¥ 48,000,000 | ¥ 0 |  |
Du Xiaoman Financial |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deconsolidation, disposal gain | $ 874,000,000 | ¥ 6,000,000,000 |  |  |  |  |  |  |  |  |  |
Equity interest percentage | 41.00% | 41.00% |  |  |  |  |  |  |  |  |  |
Global Ad and Tools Business |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disposal gain recognized |  |  | $ 130,000,000 | ¥ 893,000,000 |  |  |  |  |  |  |  |

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- Definition Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
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- Definition Amount of cumulative impairment loss on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117539-209714 + Details
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