Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]    
Fair Value Hedge Liabilities $ 6,498 $ 4,845
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 29 (12)
Interest expense subordinated notes and other long term debt [Member] | Subordinated notes [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge 41 (68)
Interest expense subordinated notes and other long term debt [Member] | Hedged Subordinated notes [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge $ (41) $ 71