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DERIVATIVE FINANCIAL INSTRUMENTS DERIVATIVE FINANCIAL INSTRUMENTS - Cash Flow Hedges (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]
 
 
 
 
 
 
 
 
  
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, Notional Amount $ 20,877 $ 4,877
Economic Hedging [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, Notional Amount 2,200  
Cash Flow Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, Notional Amount 11,937 $ 12
Unassigned [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, Notional Amount 2,200  
Unassigned [Member] | Economic Hedging [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, Notional Amount 2,200  
Unassigned [Member] | Cash Flow Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, Notional Amount 0  
Loans Payable [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, Notional Amount 11,925  
Loans Payable [Member] | Economic Hedging [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, Notional Amount 0  
Loans Payable [Member] | Cash Flow Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, Notional Amount $ 11,925