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PRINCIPAL ACCOUNTING POLICIES - Option activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Shares        
Outstanding, beginning 66,081,119 57,583,856 54,368,896  
Granted 17,311,708 15,404,097 8,921,248  
Exercised (4,493,648) (5,106,035) (3,495,960)  
Forfeited (1,424,477) (1,800,799) (2,210,328)  
Outstanding, ending 77,474,702 66,081,119 57,583,856 54,368,896
Vested and expect to vest, ending 74,652,470      
Exercisable, ending 42,196,796      
Weighted Average Exercise Price        
Outstanding, beginning (in dollars per share) $ 23.02 $ 22.55 $ 22.21  
Granted (in dollars per share) 14.15 18.46 15.87  
Exercised (in dollars per share) 5.7 9.32 6.96  
Forfeited (in dollars per share) 10.8 7.9 12  
Outstanding, ending (in dollars per share) 22.26 $ 23.02 $ 22.55 $ 22.21
Vested and expect to vest, ending (in dollars per share) 22.43      
Exercisable, ending (in dollars per share) $ 25.97      
Weighted Average Remaining Contractual Life (Years)        
Outstanding 5 years 3 days 5 years 5 months 1 day 5 years 1 month 28 days 5 years 7 months 17 days
Vested and expect to vest at the end of the period 4 years 11 months 15 days      
Exercisable at the end of the period 3 years 9 months 29 days      
Aggregate Intrinsic Value        
Outstanding $ 995 $ 398 $ 704 $ 679
Vested and expect to vest 948      
Exercisable $ 410      
Assumptions        
Pre-vesting forfeiture rate assumptions (as a percent) 8.00%      
Total intrinsic value of options exercised $ 90 $ 128 $ 159