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DEBT (Maturities of Long-Term Debt) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Debt Instruments [Abstract]    
Remainder of 2019 $ 1  
2020 803  
2021 553  
2022 3  
2023 1  
Thereafter 2,649  
Total maturities of long-term debt 4,010  
Unamortized discount (9)  
Debt issuance costs (19) $ (17)
Fair value basis adjustments attributable to hedged debt 11  
Total long-term debt 3,993 3,893
Current portion of long-term debt 805 464
Total long-term debt, net of current portion $ 3,188 $ 3,429