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DERIVATIVE FINANCIAL INSTRUMENTS - Change in Fair Values of Derivative Instruments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about hedging instruments [line items]    
Unrealized Gains on Derivative Financial Assets $ 222  
Unrealized Losses on Derivative Financial Liabilities (9)  
Net Change 213 $ (242)
Foreign exchange contracts    
Disclosure of detailed information about hedging instruments [line items]    
Unrealized Gains on Derivative Financial Assets 182  
Unrealized Losses on Derivative Financial Liabilities 173  
Net Change 355 (305)
Interest rates swaps and other    
Disclosure of detailed information about hedging instruments [line items]    
Unrealized Gains on Derivative Financial Assets 40  
Unrealized Losses on Derivative Financial Liabilities (182)  
Net Change $ (142) $ 63