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COMPREHENSIVE INCOME (LOSS) - ADDITIONAL INFORMATION (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Derivative [Line Items]        
Cumulative foreign currency translation adjustment gain (loss) $ 4,930 $ 4,970 $ 4,690 $ 5,095
Foreign Currency Translation Gain (Loss)        
Derivative [Line Items]        
Foreign currency tax adjustment 190 216    
Cumulative foreign currency translation adjustment gain (loss) (286) (187) $ (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) (159) (25)    
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest, Net Investment Hedges        
Derivative [Line Items]        
Cumulative foreign currency translation adjustment gain (loss) $ (127) $ (162)