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Investments - Long-term Investments - Additional information (Detail) ¥ in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 26, 2015 shares | Aug. 31, 2017 USD ($) | Aug. 31, 2017 CNY (¥) | May 31, 2017 USD ($) | May 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 CNY (¥) | Oct. 30, 2017 USD ($) | Oct. 30, 2017 CNY (¥)
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of cost method investments |  |  |  |  |  | $ 3,300 |  | ¥ 12,900 |  | ¥ 21,800 |  |
Total purchase consideration attributable to the noncontrolling interest |  |  |  |  |  |  |  |  |  |  | $ 615 | ¥ 4,000
Carrying amount of equity method investments |  |  |  |  |  | 4,800 |  | 32,300 |  | ¥ 31,400 |  |
Impairment charges on long-term investments |  |  |  |  |  | $ 92 | ¥ 597 | 245 | ¥ 117 |  |  |
Uber |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gains recognized on share exchange transaction | ¥ |  |  |  |  |  |  |  | 2,000 |  |  |  |
Certain Group of Assets and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate deconsolidated gain | ¥ |  |  |  |  |  |  |  | 1,400 |  |  |  |
Mobile Game Business |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gains recognized on share exchange transaction |  |  |  | $ 142 | ¥ 923 |  |  |  |  |  |  |
China United Network Communication Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total purchase consideration |  |  |  |  |  |  |  |  |  |  | $ 1,100 | ¥ 7,000
Xiaodu Life Technology Ltd |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gains recognized on share exchange transaction |  | $ 712 | ¥ 4,600 |  |  |  |  |  |  |  |  |
Qunar | Class A Ordinary Shares |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares exchanged | shares | 178,702,519 |  |  |  |  |  |  |  |  |  |  |
Qunar | Class B Ordinary Shares |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares exchanged | shares | 11,450,000 |  |  |  |  |  |  |  |  |  |  |
Ctrip.com International, Ltd |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares newly-issued in exchange | shares | 11,488,381 |  |  |  |  |  |  |  |  |  |  |
Equity method investment, percentage of ownership |  |  |  |  |  | 19.00% |  |  |  | 19.00% |  |
Fair value of equity investment |  |  |  |  |  | $ 4,600 |  | ¥ 29,200 |  | ¥ 30,200 |  |
Ctrip.com International, Ltd | Total Other Income, Net |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gains recognized on share exchange transaction | ¥ |  |  |  |  |  |  |  |  | ¥ 24,400 |  |  |

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