DEBT - Scheduled Future Principal Payments for Debt (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Long Term Debt Maturities Repayments Of Principal [Line Items]
2019, remaining	$ 39
2020	11
2021	11
2022	241
2023	316
Thereafter	1,615
Total principal payments	2,233
Revolving Corporate Credit Facility, net
Long Term Debt Maturities Repayments Of Principal [Line Items]
2019, remaining	0
2020	0
2021	0
2022	0
2023	75
Thereafter	0
Total principal payments	75
Other debt, net
Long Term Debt Maturities Repayments Of Principal [Line Items]
2019, remaining	1
2020	2
2021	2
2022	2
2023	3
Thereafter	9
Total principal payments	19
Senior Notes \| Exchange Notes, net
Long Term Debt Maturities Repayments Of Principal [Line Items]
2019, remaining	0
2020	0
2021	0
2022	0
2023	89
Thereafter	0
Total principal payments	89
Senior Notes \| Senior Unsecured Notes
Long Term Debt Maturities Repayments Of Principal [Line Items]
2019, remaining	0
2020	0
2021	0
2022	0
2023	0
Thereafter	750
Total principal payments	750
Senior Notes \| IAC Notes
Long Term Debt Maturities Repayments Of Principal [Line Items]
2019, remaining	0
2020	0
2021	0
2022	0
2023	141
Thereafter	0
Total principal payments	141
Convertible Debt \| Convertible Notes
Long Term Debt Maturities Repayments Of Principal [Line Items]
2019, remaining	0
2020	0
2021	0
2022	230
2023	0
Thereafter	0
Total principal payments	230	$ 230
Non-interest bearing note payable, net \| Non-Interest Bearing Note Payable
Long Term Debt Maturities Repayments Of Principal [Line Items]
2019, remaining	31
2020	0
2021	0
2022	0
2023	0
Thereafter	0
Total principal payments	31
Corporate Credit Facility \| Term Loan
Long Term Debt Maturities Repayments Of Principal [Line Items]
2019, remaining	7
2020	9
2021	9
2022	9
2023	8
Thereafter	856
Total principal payments	898	900
Corporate Credit Facility \| Revolving Corporate Credit Facility, net
Long Term Debt Maturities Repayments Of Principal [Line Items]
Total principal payments	$ 75	$ 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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