Annual report pursuant to Section 13 and 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
3 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Loss Contingency, Period of Occurrence P2Y    
Debt Instrument, Maturity Date, Description P90D    
Commercial      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract amount represents credit risk   $ 18,326 $ 17,149
Consumer      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract amount represents credit risk   14,831 14,974
Commercial real estate      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract amount represents credit risk   1,364 1,188
Standby letters of credit      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract amount represents credit risk   587 676
Commercial | Commercial letters of credit      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contract amount represents credit risk   $ 8 $ 14