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Redeemable Noncontrolling Interests - Additional Information (Detail) ¥ in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 26, 2017 USD ($) | May 31, 2016 USD ($) shares | Oct. 31, 2015 USD ($) shares | Nov. 30, 2014 USD ($) | Dec. 31, 2017 USD ($) shares | Dec. 31, 2017 CNY (¥) shares | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2015 CNY (¥)
Temporary Equity Disclosure [Abstract] |  |  |  |  |  |  |  |
Accretion recorded as increase to net income |  |  |  |  | $ 3 | ¥ 17 | ¥ (557) | ¥ (329)
Preferred Stock |  |  |  |  |  |  |  |
Temporary Equity Disclosure [Abstract] |  |  |  |  |  |  |  |
Preferred stock, shares issued | shares |  |  |  |  | 0 | 0 | 0 |
iQIYI |  |  |  |  |  |  |  |
Temporary Equity Disclosure [Abstract] |  |  |  |  |  |  |  |
Preferred shares financing |  |  |  | $ 300 |  |  |  |
Accretion recorded as increase to net income |  |  |  |  | $ 61 | ¥ 400 |  |
iQIYI | Convertible notes (the"iQIYI Notes") | Preferred Stock |  |  |  |  |  |  |  |
Temporary Equity Disclosure [Abstract] |  |  |  |  |  |  |  |
Notes converted to preferred shares | $ 1,200 |  |  |  |  |  |  |
Xiaodu Life Technology Ltd |  |  |  |  |  |  |  |
Temporary Equity Disclosure [Abstract] |  |  |  |  |  |  |  |
Preferred shares financing |  | $ 100 | $ 250 |  |  |  |  |
Preferred stock, shares issued | shares |  | 42,105,264 | 250,000,000 |  |  |  |  |

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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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