Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND CONTINGENT LIABILITIES - Commitments to Extend Credit (Details)

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COMMITMENTS AND CONTINGENT LIABILITIES - Commitments to Extend Credit (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Commercial    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract amount represents credit risk $ 16,641 $ 16,219
Consumer    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract amount represents credit risk 14,338 13,384
Commercial Real Estate    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract amount represents credit risk 1,200 1,366
Standby Letters of Credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract amount represents credit risk 601 510
Commercial | Letter of Credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract amount represents credit risk $ 27 $ 21