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FINANCIAL INSTRUMENTS - Cash and Equivalents (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents $ 2,234 $ 2,389 $ 2,455
Carrying value      
Disclosure of detailed information about financial instruments [line items]      
Cash deposits 662 1,009  
Term deposits 427 654  
Money market investments 1,145 726  
Cash and equivalents 2,234 2,389  
Carrying value | Cash held in subsidiaries with restrictions      
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents $ 305 $ 943