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DEBT (Maturities of Long-Term Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Instruments [Abstract]    
Remainder of 2020 $ 2  
2021 553  
2022 3  
2023 1  
2024 302  
Thereafter 3,147  
Total maturities of long-term debt 4,008  
Unamortized discount (10)  
Debt issuance costs (25) $ (26)
Fair value basis adjustments attributable to hedged debt 63  
Total long-term debt 4,036 4,770
Current portion of long-term debt 3 804
Total long-term debt, net of current portion $ 4,033 $ 3,966