Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE - FAIR VALUES OF FINANCIAL INSTRUMENTS (Details)

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FAIR VALUE - FAIR VALUES OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Carrying Amount    
Fair values of financial instruments    
Non-qualified employee benefit plan investments $ 22 $ 28
Long-term debt (including current portion) (2,177) (2,389)
Estimated Fair Value    
Fair values of financial instruments    
Non-qualified employee benefit plan investments 22 28
Long-term debt (including current portion) $ (2,288) $ (2,544)