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FAIR VALUE MEASUREMENTS - LONG-TERM DEBT (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Non-recurring purchase price accounting fair value adjustment $ 3 $ 3
Carrying amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed rate debt at cost 838 956
Long-term debt 841 959
Fair value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 831 $ 959