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COMPREHENSIVE INCOME (LOSS) - ADDITIONAL INFORMATION (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Derivative [Line Items]                
Cumulative foreign currency translation adjustment gain (loss) $ 5,125 $ 5,077 $ 4,930 $ 4,970 $ 4,763 $ 4,645 $ 4,690 $ 5,095
Foreign Currency Translation Gain (Loss)                
Derivative [Line Items]                
Foreign currency tax adjustment 182     216        
Cumulative foreign currency translation adjustment gain (loss) (317) $ (249) $ (286) (187) $ (328) $ (412) $ (487) $ (368)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest, Translation Gain (Loss)                
Derivative [Line Items]                
Cumulative foreign currency translation adjustment gain (loss) (113)     (25)        
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest, Net Investment Hedges                
Derivative [Line Items]                
Cumulative foreign currency translation adjustment gain (loss) $ (204)     $ (162)