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Changes in Equity and Redeemable Noncontrolling Interests - Additional Information (Detail) ¥ in Millions, $ in Millions |  |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Aug. 01, 2020 USD ($) | May 13, 2020 USD ($) | May 16, 2019 USD ($) | Jun. 30, 2020 CNY (¥) shares | Jun. 30, 2020 USD ($) shares | Jun. 30, 2019 CNY (¥) shares | Jun. 30, 2019 USD ($) shares
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, proposed aggregate value |  | $ 1,000 | $ 1,000 |  |  |  |
Stock repurchase program, expiration date |  | Jul. 01, 2021 | Jul. 01, 2020 |  |  |  |
Number of Class A ordinary shares repurchased | shares |  |  |  | 685,091 | 685,091 | 259,142 | 259,142
Aggregate purchase price |  |  |  | ¥ 5,130 | $ 725 | ¥ 1,999 | $ 291
Two Thousand And Twenty Share Repurchase Program |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, proposed aggregate value | $ 3,000 |  |  |  |  |  |
Two Thousand And Twenty Share Repurchase Program | Subsequent Event |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, expiration date | Dec. 31, 2022 |  |  |  |  |  |

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