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, 2018
Dec. 31, 2017
Carrying Amount    
Fair values of financial instruments    
Non-qualified employee benefit plan investments $ 25 $ 33
Long-term debt (including current portion) (2,566) (2,298)
Carrying Amount | Interest rate contracts    
Fair values of financial instruments    
Derivative contracts - liabilities (1) (1)
Estimated Fair Value    
Fair values of financial instruments    
Non-qualified employee benefit plan investments 25 33
Long-term debt (including current portion) (2,705) (2,483)
Estimated Fair Value | Interest rate contracts    
Fair values of financial instruments    
Derivative contracts - liabilities $ (1) $ (1)