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FAIR VALUE MEASUREMENTS - Other Fair Value Measurements (Details) - Level 2 - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Other Fair Value Measurements [Line Items]    
Carrying value of long-term debt and current portion of long-term debt $ 8,084 $ 7,107
Fair value of long-term debt and current portion of long-term debt $ 8,513 $ 7,061