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LEASES - Schedule of Maturities of Operating Leases (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Jan. 01, 2019
Leases [Abstract]    
2019 (excluding six months) $ 30  
2020 52  
2021 40  
2022 31  
2023 21  
Thereafter 36  
Total lease payments 210  
Less interest (8)  
Present value of lease liabilities $ 202 $ 205