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LEASES (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Leased Assets [Line Items]        
Operating lease expiration date   2036    
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
2019 $ 65 $ 65    
2020 49 49    
2021 36 36    
2022 27 27    
2023 18 18    
Thereafter 38 38    
Total minimum payments required 233 233    
Less amounts representing sublease income (11) (11)    
Future minimum lease payments, net of income 222 222    
Operating lease, rent expense   76 $ 76 $ 81
Operating lease, sublease income   3 $ 2 $ 2
Chicago Office [Member]        
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Total minimum payments required 48 $ 48    
Operating lease, sublease income $ 6      
Lessee, Operating Lease, Term of Contract 10 years