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FINANCIAL INSTRUMENTS - Cash and Equivalents (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents $ 3,314 $ 1,571 $ 2,234
Carrying value      
Disclosure of detailed information about financial instruments [line items]      
Cash deposits 2,571 842  
Term deposits 728 477  
Money market investments 15 252  
Cash and equivalents 3,314 1,571  
Carrying value | Cash held in subsidiaries with restrictions      
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents $ 0 $ 383