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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