DEBT - Scheduled Future Principal Payments for Debt (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Long Term Debt Maturities Repayments Of Principal [Line Items]
2020, remaining	$ 7
2021	9
2022	239
2023	605
2024	9
Thereafter	1,948
Total	2,817
Senior Notes \| 2026 Notes
Long Term Debt Maturities Repayments Of Principal [Line Items]
2020, remaining	0
2021	0
2022	0
2023	0
2024	0
Thereafter	750
Total	750	$ 750
Senior Notes \| 2028 Notes
Long Term Debt Maturities Repayments Of Principal [Line Items]
2020, remaining	0
2021	0
2022	0
2023	0
2024	0
Thereafter	350
Total	350	350
Convertible Notes \| Convertible Notes
Long Term Debt Maturities Repayments Of Principal [Line Items]
2020, remaining	0
2021	0
2022	230
2023	0
2024	0
Thereafter	0
Total	230	230
Corporate Credit Facility \| Term Loan
Long Term Debt Maturities Repayments Of Principal [Line Items]
2020, remaining	7
2021	9
2022	9
2023	9
2024	9
Thereafter	848
Total	891	893
Corporate Credit Facility \| Revolving Corporate Credit Facility, net
Long Term Debt Maturities Repayments Of Principal [Line Items]
2020, remaining	0
2021	0
2022	0
2023	596
2024	0
Thereafter	0
Total	$ 596	$ 30

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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