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v3.20.1

Shareholder's Equity - Additional Information (Detail) $ / shares in Units, ¥ in Millions, $ in Millions |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 27, 2018 USD ($) | Oct. 29, 2015 USD ($) | Oct. 31, 2019 CNY (¥) | Oct. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 CNY (¥) shares | Dec. 31, 2017 CNY (¥) shares | Dec. 31, 2019 USD ($) $ / shares shares | May 16, 2019 USD ($) | Dec. 31, 2018 $ / shares
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  | 870,400,000 |  |  |  | 870,400,000 |  |
Par value per share (US$) | $ / shares |  |  |  |  |  |  |  |  | $ 0.00005 |  |
Transfer of Class B ordinary shares to Class A Ordinary shares |  |  |  |  | 0 | 0 | 0 | 200,000 |  |  |
Stock repurchase program, proposed aggregate value | $ | $ 1,000 | $ 2,000 |  |  |  |  |  |  |  | $ 1,000 |
Stock repurchase program, period | 12 months | 24 months |  |  |  |  |  |  |  |  |
Number of Class A ordinary shares repurchased |  |  |  |  | 664,534 | 664,534 | 207,165 | 145,783 |  |  |
Aggregate purchase price |  |  |  |  | ¥ 4,958 | $ 712 | ¥ 3,312 | ¥ 1,724 |  |  |
Allocation of after-tax profits to statutory surplus fund, percentage |  |  |  |  | 10.00% | 10.00% |  |  |  |  |
Limit of statutory surplus fund as a percentage of registered capital, after which allocations to statutory surplus fund are no longer required |  |  |  |  | 50.00% | 50.00% |  |  |  |  |
Amounts of restricted paid up capital and statutory reserve funds of PRC subsidiaries and net assets of VIEs |  |  |  |  | ¥ 40,800 |  | ¥ 25,700 |  | $ 5,900 |  |
Trip.com International, Ltd |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | ¥ 989 | $ 142 |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Par value per share (US$) | $ / shares |  |  |  |  |  |  |  |  | $ 0.00005 |  |
Preferred stock, shares authorized |  |  |  |  | 10,000,000 |  |  |  | 10,000,000 |  |
Preferred stock, shares issued |  |  |  |  | 0 |  | 0 |  | 0 |  |
Preferred stock, shares outstanding |  |  |  |  | 0 |  | 0 |  | 0 |  |
Class A Ordinary Shares |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  | 825,000,000 |  | 825,000,000 |  | 825,000,000 |  |
Par value per share (US$) | $ / shares |  |  |  |  |  |  |  |  | $ 0.00005 |  | $ 0.00005
Number of votes per share |  |  |  |  | one | one |  |  |  |  |
Common stock, shares outstanding |  |  |  |  | 27,381,621 |  | 27,733,692 |  | 27,381,621 |  |
Class B Ordinary Shares |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  | 35,400,000 |  | 35,400,000 |  | 35,400,000 |  |
Par value per share (US$) | $ / shares |  |  |  |  |  |  |  |  | $ 0.00005 |  | $ 0.00005
Number of votes per share |  |  |  |  | ten | ten |  |  |  |  |
Common stock, shares outstanding |  |  |  |  | 7,201,254 |  | 7,201,254 |  | 7,201,254 |  |

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