Annual report pursuant to Section 13 and 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Cash Flow Hedges) (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Cash Flow Hedges) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Fair value hedging adjustments   $ 93 $ 127  
Purchase of interest rate caps and derivative financial instruments, notional value $ 25,927 25,927 4,877  
Change in fair value of cash flow hedging relationships arising during the period       $ 3
Cash Flow Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Purchase of interest rate caps and derivative financial instruments, notional value 18,387 18,387 12  
Fair Value Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Purchase of interest rate caps and derivative financial instruments, notional value 7,540 $ 7,540 4,865  
Subordinated notes | Interest expense subordinated notes and other long term debt        
Derivative Instruments, Gain (Loss) [Line Items]        
Increase or (decrease) to interest expense for derivatives designated as fair value hedges 127   112 (53)
Hedged subordinated notes | Interest expense subordinated notes and other long term debt        
Derivative Instruments, Gain (Loss) [Line Items]        
Increase or (decrease) to interest expense for derivatives designated as fair value hedges $ (125)   $ (104) $ 54