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DEBT - Convertible Senior Notes (Details)
12 Months Ended
May 12, 2020
USD ($)
$ / shares
May 12, 2020
CNY (¥)
Nov. 03, 2017
USD ($)
$ / shares
Nov. 03, 2017
CNY (¥)
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2021
CNY (¥)
shares
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2021
CNY (¥)
May 12, 2020
CNY (¥)
Nov. 03, 2017
CNY (¥)
Debt Instrument [Line Items]                    
Amount converted           ¥ 0 ¥ 0      
Note repurchased         $ 0 0        
Convertible senior notes | 2022 Notes                    
Debt Instrument [Line Items]                    
Aggregate principal amount     $ 475,000,000   $ 475,000,000     ¥ 3,027,000,000    
Fixed interest rate (as a percent)     0.375%             0.375%
Initial conversion rate per ADS     5.4869 5.4869            
Increment used for debt conversion | $     $ 1,000              
Initial conversion price | $ / shares     $ 182.25              
Repurchase price as a percentage of principal amount     100.00% 100.00%            
Proceeds from issuance of debt     $ 467,000,000 ¥ 3,093,000,000            
Debt issuance costs     $ 8,000,000             ¥ 54,000,000
Amount converted           ¥ 40,000.00 ¥ 60,000.00      
Number of shares converted | shares         134 134 202      
Note repurchased           ¥ 0 ¥ 40,000.00      
Beneficial conversion feature           ¥ 0        
Convertible senior notes | 2026 Notes                    
Debt Instrument [Line Items]                    
Aggregate principal amount | $ $ 450,000,000                  
Additional aggregate maximum amount of notes to purchase | $ $ 50,000,000                  
Fixed interest rate (as a percent) 3.00%               3.00%  
Initial conversion rate per ADS 41.72 41.72                
Increment used for debt conversion | $ $ 1,000                  
Initial conversion price | $ / shares $ 23.971                  
Repurchase price as a percentage of principal amount 100.00% 100.00%                
Proceeds from issuance of debt $ 493,000,000 ¥ 3,499,000,000                
Debt issuance costs $ 7,000,000               ¥ 49,000,000  
Beneficial conversion feature   ¥ 0