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FAIR VALUE MEASUREMENTS - Other Fair Value Measurements (Details) - Level 2 [Member] - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Other Fair Value Measurements [Line Items]    
Carrying value of long-term debt and current portion of long-term debt $ 7,692 $ 7,745
Fair value of long-term debt and current portion of long-term debt $ 7,790 $ 8,048