v3.22.1
Shareholder's Equity - Additional Information (Detail)
$ / shares in Units, ¥ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Jun. 27, 2018
USD ($)
Oct. 31, 2019
CNY (¥)
Dec. 31, 2021
CNY (¥)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2019
CNY (¥)
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Aug. 31, 2020
USD ($)
May 13, 2020
USD ($)
May 16, 2019
USD ($)
Stockholders Equity Note [Line Items]                      
Shares authorized     69,632,000,000       69,632,000,000        
Transfer of Class B ordinary shares to Class A Ordinary shares     12,600,000 12,600,000 4,200,000 0          
Stock repurchase program, proposed aggregate value | $ $ 1,000                   $ 1,000
Stock repurchase program, period 12 months                    
Number of Class A ordinary shares repurchased and retired         126,096,000 53,162,720          
Aggregate purchase price | ¥         ¥ 13,054 ¥ 4,958          
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     ¥ 45,900   45,000   $ 7,200        
Foreign currency translation adjustment     ¥ 537 $ 84 ¥ 1,200 ¥ 0          
Treasury Stock, Shares, Acquired     57,343,528 57,343,528 0            
Number of Class A ordinary shares repurchased and not retired     57,343,528 57,343,528              
Aggregate purchase price | ¥     ¥ 7,581                
Previously Reported [Member]                      
Stockholders Equity Note [Line Items]                      
Number of Class A ordinary shares repurchased and retired         1,576,200 664,534          
Number of Class A ordinary shares repurchased and not retired     716,794 716,794              
2020 Shares Repurchase Program                      
Stockholders Equity Note [Line Items]                      
Stock repurchase program, proposed aggregate value | $               $ 4,500 $ 3,000 $ 1,000  
Trip.com International, Ltd                      
Stockholders Equity Note [Line Items]                      
Amounts reclassified from accumulated other comprehensive income (loss) | ¥   ¥ 989                  
Preferred Stock                      
Stockholders Equity Note [Line Items]                      
Preferred stock, shares authorized     800,000,000       800,000,000        
Preferred Stock | Previously Reported [Member]                      
Stockholders Equity Note [Line Items]                      
Preferred stock, shares authorized     10,000,000       10,000,000        
Class A Ordinary Shares                      
Stockholders Equity Note [Line Items]                      
Common stock, shares authorized     66,000,000,000   66,000,000,000   66,000,000,000 66,000,000,000      
Par value per share (US$) | $ / shares             $ 0.000000625 $ 0.000000625      
Common stock, shares outstanding     2,205,032,472   2,107,228,720   2,205,032,472 2,107,228,720      
Aggregate purchase price | ¥         ¥ 13,100 ¥ 5,000          
Aggregate purchase price     ¥ 7,600 $ 1,200              
Class A Ordinary Shares | Previously Reported [Member]                      
Stockholders Equity Note [Line Items]                      
Common stock, shares authorized         825,000,000     825,000,000      
Par value per share (US$) | $ / shares               $ 0.00005      
Common stock, shares outstanding     27,562,906       27,562,906        
Class B Ordinary Shares                      
Stockholders Equity Note [Line Items]                      
Common stock, shares authorized     2,832,000,000   2,832,000,000   2,832,000,000 2,832,000,000      
Par value per share (US$) | $ / shares             $ 0.000000625 $ 0.000000625      
Number of votes per share     ten ten              
Common stock, shares outstanding     559,300,320   571,900,320   559,300,320 571,900,320      
Class B Ordinary Shares | Previously Reported [Member]                      
Stockholders Equity Note [Line Items]                      
Common stock, shares authorized     35,400,000       35,400,000        
Par value per share (US$) | $ / shares               $ 0.00005      
Common stock, shares outstanding     6,991,254       6,991,254