Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND CONTINGENT LIABILITIES - Narrative (Details)

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COMMITMENTS AND CONTINGENT LIABILITIES - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items]    
Maturity period of majority of standby letters of credit P2Y  
Maturity period of Commercial letters of credit P90D  
Maturity period of forward contracts relating mortgage banking business 1 year  
Standby Letters of Credit    
Loss Contingencies [Line Items]    
Carrying amount of deferred revenue associated with guarantees $ 11,000,000 $ 10,000,000
Outstanding standby letters of credit 583,000,000 510,000,000
Commitments to Sell Loans    
Loss Contingencies [Line Items]    
Commitments to sell residential real estate loans 800,000,000 $ 696,000,000
Maximum    
Loss Contingencies [Line Items]    
Aggregate range of reasonably possible losses current legal proceedings 30,000,000  
Minimum    
Loss Contingencies [Line Items]    
Aggregate range of reasonably possible losses current legal proceedings $ 0