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Notes Payable - Additional Information (Detail) ¥ in Millions, $ in Millions |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 26, 2017 USD ($) shares | Jan. 25, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 CNY (¥) | Jul. 06, 2017 USD ($) Tranche | Jun. 30, 2015 USD ($) Tranche | Jun. 09, 2014 USD ($) | Aug. 06, 2013 USD ($) | Nov. 28, 2012 USD ($) Tranche
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of debt |  |  | $ 1,526 | ¥ 9,926 | ¥ 0 | ¥ 10,407 |  |  |  |  |  |
Unsecured Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of tranches issued and sold | Tranche |  |  |  |  |  |  |  | 2 | 2 |  |  | 2
Net proceeds from issuance of debt |  |  | 1,600 | ¥ 10,100 | ¥ 0 | ¥ 7,800 |  |  |  |  |  |
Discount on debt issued |  |  | 19 |  |  |  | ¥ 121 |  |  |  |  |
Debt issuance cost |  |  | $ 26 |  |  |  | ¥ 172 |  |  |  |  |
Unsecured Senior Notes Due Two Thousand Seventeen |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  |  |  |  | $ 750
Debt, maturity date |  |  | Nov. 28, 2017 | Nov. 28, 2017 |  |  |  |  |  |  |  |
Interest rate |  |  | 2.25% |  |  |  | 2.25% |  |  |  |  |
Effective interest rate |  |  | 2.36% |  |  |  | 2.36% |  |  |  |  |
Unsecured Senior Notes Due Two Thousand Twenty Two |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  |  |  |  | $ 750
Debt, maturity date |  |  | Nov. 28, 2022 | Nov. 28, 2022 |  |  |  |  |  |  |  |
Interest rate |  |  | 3.50% |  |  |  | 3.50% |  |  |  |  |
Effective interest rate |  |  | 3.59% |  |  |  | 3.59% |  |  |  |  |
Unsecured Senior Notes Due Twenty Eighteen |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  |  |  | $ 1,000 |
Debt, maturity date |  |  | Aug. 06, 2018 | Aug. 06, 2018 |  |  |  |  |  |  |  |
Interest rate |  |  | 3.25% |  |  |  | 3.25% |  |  |  |  |
Effective interest rate |  |  | 3.39% |  |  |  | 3.39% |  |  |  |  |
Unsecured Senior Notes Due Twenty Nineteen |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  |  | $ 1,000 |  |
Debt, maturity date |  |  | Jun. 09, 2019 | Jun. 09, 2019 |  |  |  |  |  |  |  |
Interest rate |  |  | 2.75% |  |  |  | 2.75% |  |  |  |  |
Effective interest rate |  |  | 3.00% |  |  |  | 3.00% |  |  |  |  |
Unsecured Senior Notes Due Two Thousand Twenty |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  | $ 750 |  |  |
Debt, maturity date |  |  | Jun. 30, 2020 | Jun. 30, 2020 |  |  |  |  |  |  |  |
Interest rate |  |  | 3.00% |  |  |  | 3.00% |  |  |  |  |
Effective interest rate |  |  | 3.13% |  |  |  | 3.13% |  |  |  |  |
Unsecured Senior Notes Due Two Thousand Twenty Five |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  | $ 500 |  |  |
Debt, maturity date |  |  | Jun. 30, 2025 | Jun. 30, 2025 |  |  |  |  |  |  |  |
Interest rate |  |  | 4.13% |  |  |  | 4.13% |  |  |  |  |
Effective interest rate |  |  | 4.22% |  |  |  | 4.22% |  |  |  |  |
Unsecured Senior Notes Due 2022 Five-Year Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  | $ 900 |  |  |  |
Debt, maturity date |  |  | Jul. 06, 2022 | Jul. 06, 2022 |  |  |  |  |  |  |  |
Interest rate |  |  | 2.88% |  |  |  | 2.88% |  |  |  |  |
Effective interest rate |  |  | 3.08% |  |  |  | 3.08% |  |  |  |  |
Unsecured Senior Notes Due 2027 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  | $ 600 |  |  |  |
Debt, maturity date |  |  | Jul. 06, 2027 | Jul. 06, 2027 |  |  |  |  |  |  |  |
Interest rate |  |  | 3.63% |  |  |  | 3.63% |  |  |  |  |
Effective interest rate |  |  | 3.73% |  |  |  | 3.73% |  |  |  |  |
Convertible notes (the"iQIYI Notes") | iQIYI |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  | $ 1,500 |  |  |  |  |  |  |  |  |  |
Debt, maturity date |  | Jan. 25, 2018 |  |  |  |  |  |  |  |  |  |
Interest rate |  | 1.50% |  |  |  |  |  |  |  |  |  |
Convertible notes (the"iQIYI Notes") | iQIYI | Parent Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  | $ 300 |  |  |  |  |  |  |  |  |  |
Convertible notes (the"iQIYI Notes") | iQIYI | External Investors |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  | $ 1,200 |  |  |  |  |  |  |  |  |  |
Convertible notes (the"iQIYI Notes") | Preferred Stock | iQIYI |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes converted to preferred shares | $ 1,500 |  |  |  |  |  |  |  |  |  |  |
Accrued interest converted shares | shares | 1,014,436,019 |  |  |  |  |  |  |  |  |  |  |

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