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DERIVATIVE FINANCIAL INSTRUMENTS - Change in Fair Values of Derivative Instruments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about hedging instruments [line items]    
Unrealized Gains on Derivative Financial Assets $ 180  
Unrealized Losses on Derivative Financial Liabilities (339)  
Net Change (159) $ 213
Foreign exchange contracts    
Disclosure of detailed information about hedging instruments [line items]    
Unrealized Gains on Derivative Financial Assets 25  
Unrealized Losses on Derivative Financial Liabilities (153)  
Net Change (128) 355
Interest rates swaps and other    
Disclosure of detailed information about hedging instruments [line items]    
Unrealized Gains on Derivative Financial Assets 155  
Unrealized Losses on Derivative Financial Liabilities (186)  
Net Change $ (31) $ (142)