DERIVATIVES AND HEDGING ACTIVITIES - Derivatives Collar Schedule (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts outstanding	$ 560
Designated as Hedging Instrument [Member]
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts outstanding	560
Collar [Member] | Designated as Hedging Instrument [Member]
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts expired	$ 560
Effective date	Jun. 25, 2019
Derivative Maturity Date	Jun. 24, 2028
Collar [Member] | Designated as Hedging Instrument [Member] | LIBOR [Member]
Derivative Instrument and Hedging Activities [Line Items]
Derivative, Cap Interest Rate	2.75%
Derivative, Floor Interest Rate	0.402%
Collar, Decrease Date June 29, 2020 [Member] | Designated as Hedging Instrument [Member]
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts expired	$ 460
Collar, Decrease Date June 28, 2021 [Member] | Designated as Hedging Instrument [Member]
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts expired	340
Collar, Decrease Date June 28, 2022 [Member] | Designated as Hedging Instrument [Member]
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts expired	220
Collar, Decrease Date June 28, 2023 [Member] | Designated as Hedging Instrument [Member]
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts expired	$ 90