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Notes Payable - Additional Information (Detail) ¥ in Millions, $ in Millions | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 CNY (¥) | Mar. 29, 2018 USD ($) Tranche | Jul. 06, 2017 USD ($) Tranche | Jun. 30, 2015 USD ($) Tranche | Jun. 09, 2014 USD ($) | Aug. 06, 2013 USD ($) | Nov. 28, 2012 USD ($) Tranche
Unsecured Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of tranches issued and sold | Tranche |  |  | 2 | 2 | 2 |  |  | 2
Discount on debt issued | $ 20 | ¥ 140 |  |  |  |  |  |
Debt issuance cost | $ 31 | ¥ 214 |  |  |  |  |  |
Unsecured Senior Notes Due Two Thousand Seventeen |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  | $ 750
Debt, maturity date | 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 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Interest rate | 3.63% | 3.63% |  |  |  |  |  |
Effective interest rate | 3.73% | 3.73% |  |  |  |  |  |
Unsecured Senior Notes Due Two Thousand Twenty Three |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt face amount |  |  | $ 1,000 |  |  |  |  |
Debt, maturity date | Sep. 29, 2023 |  |  |  |  |  |  |
Interest rate | 3.88% | 3.88% |  |  |  |  |  |
Effective interest rate | 3.99% | 3.99% |  |  |  |  |  |
Unsecured Senior Notes Due Two Thousand Twenty Eight |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt face amount |  |  | $ 500 |  |  |  |  |
Debt, maturity date | Mar. 29, 2028 |  |  |  |  |  |  |
Interest rate | 4.38% | 4.38% |  |  |  |  |  |
Effective interest rate | 4.50% | 4.50% |  |  |  |  |  |

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