DEBT - Scheduled Future Principal Payments for Debt (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Long Term Debt Maturities Repayments Of Principal [Line Items]
Remaining 2019	$ 2
2020	9
2021	9
2022	239
2023	465
Thereafter	1,605
Total	2,329
Revolving Corporate Credit Facility, net
Long Term Debt Maturities Repayments Of Principal [Line Items]
Remaining 2019	0
2020	0
2021	0
2022	0
2023	225
Thereafter	0
Total	225
Senior Notes \| Exchange Notes
Long Term Debt Maturities Repayments Of Principal [Line Items]
Remaining 2019	0
2020	0
2021	0
2022	0
2023	89
Thereafter	0
Total	89
Senior Notes \| Senior Unsecured Notes
Long Term Debt Maturities Repayments Of Principal [Line Items]
Remaining 2019	0
2020	0
2021	0
2022	0
2023	0
Thereafter	750
Total	750
Senior Notes \| IAC Notes
Long Term Debt Maturities Repayments Of Principal [Line Items]
Remaining 2019	0
2020	0
2021	0
2022	0
2023	142
Thereafter	0
Total	142
Convertible Notes \| Convertible Notes
Long Term Debt Maturities Repayments Of Principal [Line Items]
Remaining 2019	0
2020	0
2021	0
2022	230
2023	0
Thereafter	0
Total	230	$ 230
Corporate Credit Facility \| Term Loan
Long Term Debt Maturities Repayments Of Principal [Line Items]
Remaining 2019	2
2020	9
2021	9
2022	9
2023	9
Thereafter	855
Total	893	900
Corporate Credit Facility \| Revolving Corporate Credit Facility, net
Long Term Debt Maturities Repayments Of Principal [Line Items]
Total	$ 225	$ 0

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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