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DEBT - Debt Balances, Net of Unamortized Debt Issuance Costs (Details) - USD ($)	Dec. 31, 2018	Nov. 07, 2018	Sep. 30, 2018	Sep. 04, 2018	Aug. 31, 2018	Dec. 31, 2017	Sep. 30, 2017
Debt Instrument [Line Items]
IAC Notes	$ 2,178,000,000
Debt, net	2,124,000,000					$ 260,000,000
Capital lease obligations	17,000,000					7,000,000
Other
Debt Instrument [Line Items]
IAC Notes	20,000,000					0
Exchange Notes \| Senior Notes
Debt Instrument [Line Items]
IAC Notes	89,000,000					0
Unamortized debt issuance costs	(1,000,000)					0
Debt, net	$ 88,000,000					0
Debt, stated interest rate	5.625%
Principal amount				$ 88,000,000
Senior Unsecured Notes \| Senior Notes
Debt Instrument [Line Items]
IAC Notes	$ 750,000,000					0
Unamortized debt issuance costs	(9,000,000)					0
Debt, net	741,000,000					0
Debt, stated interest rate			6.50%
Principal amount			$ 750,000,000
IAC Notes \| Senior Notes
Debt Instrument [Line Items]
IAC Notes	$ 141,000,000					0
Debt, stated interest rate	5.625%
Principal amount		$ 140,000,000		$ 88,000,000	$ 350,000,000
Term Loan \| Corporate Credit Facility
Debt Instrument [Line Items]
IAC Notes	$ 900,000,000					0
Unamortized debt discount and issuance costs	(12,000,000)					0
Debt, net	888,000,000					0
Convertible Notes \| Convertible Notes
Debt Instrument [Line Items]
IAC Notes	230,000,000					230,000,000
Unamortized debt issuance costs	(5,000,000)					(6,000,000)
Unamortized debt discount and issuance costs	(31,000,000)					(38,000,000)
Unamortized debt discount	(26,000,000)					(32,000,000)
Debt, net	199,000,000					$ 192,000,000
Debt, stated interest rate							1.50%
Principal amount							$ 230,000,000
Interest rate, effective percentage						4.70%
Non-Interest Bearing Note Payable \| Non-Interest Bearing Note Payable
Debt Instrument [Line Items]
IAC Notes	31,000,000					$ 64,000,000
Unamortized debt discount	(1,000,000)					(3,000,000)
Debt, net	$ 30,000,000					$ 61,000,000
Interest rate, effective percentage						6.00%