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FAIR VALUE MEASUREMENTS - LONG-TERM DEBT (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Carrying amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 1,090 $ 1,179
Fair value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 1,105 $ 1,199