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
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain or (loss) recognized in OCI on derivatives (effective portion) $ 2 $ 1 $ 9
Amount of (gain) or loss reclassified from accumulated OCI into earnings (effective portion) (pre-tax) 1 0 (1)
Deposits | Interest expense deposits      
Derivative Instruments, Gain (Loss) [Line Items]      
Increase or (decrease) to interest expense for derivatives designated as fair value hedges 0 0 (1)
Hedged deposits | Interest expense deposits      
Derivative Instruments, Gain (Loss) [Line Items]      
Increase or (decrease) to interest expense for derivatives designated as fair value hedges 0 0 1
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 (14) (48) (8)
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 17 45 8
Other long-term debt | 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 (39) (74) 4
Hedged Other long term debt | 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 37 67 (4)
Loans | Interest and fee income—loans and leases | Cash Flow Hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain or (loss) recognized in OCI on derivatives (effective portion) 2 1 9
Amount of (gain) or loss reclassified from accumulated OCI into earnings (effective portion) (pre-tax) $ 1 $ 0 $ (1)