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DERIVATIVE FINANCIAL INSTRUMENTS - Change in Fair Values of Derivative Instruments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about hedging instruments [line items]    
Unrealized Gains on Derivative Financial Assets $ 656  
Unrealized Losses on Derivative Financial Liabilities (1,059)  
Net Change (403) $ (159)
Foreign exchange contracts    
Disclosure of detailed information about hedging instruments [line items]    
Unrealized Gains on Derivative Financial Assets 196  
Unrealized Losses on Derivative Financial Liabilities (409)  
Net Change (213) (128)
Interest rates swaps and other    
Disclosure of detailed information about hedging instruments [line items]    
Unrealized Gains on Derivative Financial Assets 460  
Unrealized Losses on Derivative Financial Liabilities (633)  
Net Change (173) (31)
Commodity contracts    
Disclosure of detailed information about hedging instruments [line items]    
Unrealized Gains on Derivative Financial Assets 0  
Unrealized Losses on Derivative Financial Liabilities (17)  
Net Change $ (17) $ 0