Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE - ASSETS AND LIABILITIES MEASURED AT FAIR VALUE ON A RECURRING BASIS (Details)

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FAIR VALUE - ASSETS AND LIABILITIES MEASURED AT FAIR VALUE ON A RECURRING BASIS (Details) - Recurring basis - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Liabilities:    
Transfers from Levels 1 to 2 within the fair value hierarchy, assets $ 0 $ 0
Transfers from Levels 1 and 2 within the fair value hierarchy, liabilities 0 0
Transfers from Levels 2 to 1 within the fair value hierarchy, assets 0 0
Transfers from Levels 2 and 1 within the fair value hierarchy, liabilities 0 0
Interest rate contracts    
Liabilities:    
Total liabilities (1) (1)
Non-qualified employee benefit plan investments    
Assets:    
Equity Securities, FV-NI 25 33
Quoted prices in active markets for identical assets (Level 1) | Non-qualified employee benefit plan investments    
Assets:    
Equity Securities, FV-NI 25 33
Significant other observable inputs (Level 2) | Interest rate contracts    
Liabilities:    
Total liabilities $ (1) $ (1)