Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENT LIABILITIES - Narrative (Details)

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COMMITMENTS AND CONTINGENT LIABILITIES - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Future minimum sublease rental payments:        
Operating leases, future minimum payments due, future minimum sublease rentals, total $ 4,000,000 $ 4,000,000    
2019 2,000,000 2,000,000    
2020 2,000,000 2,000,000    
2021 0 0    
2022 0 0    
2023 0 0    
Thereafter 0 0    
Operating lease, future minimum payments due:        
2019 59,000,000 59,000,000    
2020 55,000,000 55,000,000    
2021 40,000,000 40,000,000    
2022 35,000,000 35,000,000    
2023 27,000,000 27,000,000    
Thereafter 95,000,000 95,000,000    
Total rental expense for all operating leases   70,000,000 $ 76,000,000 $ 65,000,000
Maximum        
Loss Contingencies [Line Items]        
Loss Contingency, Estimate of Possible Loss 30,000,000 30,000,000    
Minimum        
Loss Contingencies [Line Items]        
Loss Contingency, Estimate of Possible Loss 0 0    
Standby letters of credit        
Loss Contingencies [Line Items]        
Contract amount represents credit risk $ 676,000,000 676,000,000 510,000,000  
Maturity period of guarantee 2 years      
Outstanding standby letters of credit $ 13,000,000 $ 13,000,000 $ 10,000,000  
Commercial Portfolio Segment [Member] | Commercial letters-of-credit        
Loss Contingencies [Line Items]        
Maturity period of guarantee 90 days