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DEBT (Maturities of Long-Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instruments [Abstract]    
2020 $ 803  
2021 553  
2022 3  
2023 1  
2024 302  
Thereafter 3,147  
Total maturities of debt 4,809  
Unamortized discount (10)  
Debt issuance costs (26) $ (17)
Fair value basis adjustments attributable to hedged debt (3)  
Total long-term debt 4,770 3,893
Current portion of long-term debt 804 464
Total long-term debt, net of current portion $ 3,966 $ 3,429