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LEASES - Lease Maturities (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]      
Leases not yet commenced, amount $ 10    
Operating Leases:      
2019 86    
2020 89    
2021 84    
2022 81    
2023 76    
Thereafter 84    
Total lease payments 500    
Less: Interest (78)    
Present value of lease liabilities $ 422 $ 439  
Lease obligation under ASC 840      
2019     $ 81
2020     74
2021     69
2022     67
2023     63
Thereafter     $ 66
Minimum      
Lessee, Lease, Description [Line Items]      
Operating leases not yet commenced, term 5 years    
Maximum      
Lessee, Lease, Description [Line Items]      
Operating leases not yet commenced, term 10 years