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DERIVATIVE FINANCIAL INSTRUMENTS - Notional Amount of Derivative Positions (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about hedging instruments [line items]    
Notional amount $ 15,855 $ 9,966
Foreign exchange contracts    
Disclosure of detailed information about hedging instruments [line items]    
Notional amount 4,626 3,482
Interest rates swaps and other    
Disclosure of detailed information about hedging instruments [line items]    
Notional amount $ 11,229 $ 6,484