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Investments - Long-term Investments - Additional information (Detail) ¥ in Millions, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
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Oct. 31, 2019 CNY (¥) shares | Oct. 31, 2019 USD ($) shares | Aug. 31, 2018 CNY (¥) | Aug. 31, 2017 CNY (¥) | May 31, 2017 CNY (¥) | Sep. 30, 2019 CNY (¥) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 CNY (¥) Directors | Dec. 31, 2019 USD ($) Directors | Dec. 31, 2018 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2019 USD ($) | Oct. 31, 2017 CNY (¥)
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment recognized for equity method investments |  |  |  |  |  |  |  | ¥ 9,200 | $ 1,300 | ¥ 167 |  |  |
Carrying amount of equity method investments |  |  |  |  |  |  |  | ¥ 27,100 |  | ¥ 44,100 |  | $ 3,900 |
Mobile Game Business |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gains recognized on share exchange transaction |  |  |  |  | ¥ 923 |  |  |  |  |  |  |  |
China United Network Communication Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase consideration |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 7,000
Total purchase consideration attributable to the noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 4,000
Trip.com International, Ltd |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, percentage of ownership |  |  |  |  |  |  |  | 12.00% |  |  |  | 12.00% |
Fair value of equity investment |  |  |  |  |  |  |  | ¥ 16,200 |  |  |  | $ 2,300 |
Losses (gains) on equity method investments | ¥ 43 | $ 6 |  |  |  |  |  |  |  |  | ¥ (24,400) |  |
Impairment recognized for equity method investments |  |  |  |  |  | ¥ 8,900 | $ 1,300 |  |  |  |  |  |
Equity method investment, disposal of ADS | shares | 36 | 36 |  |  |  |  |  |  |  |  |  |  |
Proceeds From sale of equity investments | $ |  | $ 988 |  |  |  |  |  |  |  |  |  |  |
Adjustments to goodwill acquired |  |  |  |  |  | ¥ 8,900 | $ 1,300 |  |  |  |  |  |
Number of directors | Directors |  |  |  |  |  |  |  | 9 | 9 |  |  |  |
Trip.com International, Ltd | Active directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of directors | Directors |  |  |  |  |  |  |  | 2 | 2 |  |  |  |
Xiaodu Life Technology Ltd |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gains recognized on share exchange transaction |  |  |  | ¥ 4,600 |  |  |  |  |  |  |  |  |
Du Xiaoman Financial |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate deconsolidated gain |  |  | ¥ 5,500 |  |  |  |  | ¥ 801 |  |  |  |  |
Re-measurement of retained investment |  |  | ¥ 4,200 |  |  |  |  |  |  |  |  |  |
Equity interest percentage |  |  | 41.00% |  |  |  |  |  |  |  |  |  |
Equity method goodwill |  |  | ¥ 3,500 |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  | 851 |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities |  |  | ¥ 213 |  |  |  |  |  |  |  |  |  |

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