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, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Unrealized gains (losses) on derivatives used in cash flow hedging relationships arising during the period   $ 3 $ 2
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 $ 112 (53) (122)
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 $ (104) $ 54 $ 112