DEBT - Debt Balances, Net of Unamortized Debt Issuance Costs (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Carrying Amount
Debt Instrument [Line Items]
Net carrying amount of the liability component	$ 2,680	$ 2,216
Finance leases	10	14
Debt, gross	2,719
Net carrying amount of the liability component	2,680	2,216
2025 Notes \| Senior notes
Debt Instrument [Line Items]
Debt, gross	500	0
Unamortized debt discount and issuance costs	7	0
Net carrying amount of the liability component	493	0
2026 Notes \| Senior notes
Debt Instrument [Line Items]
Debt, gross	750	750
Unamortized debt discount and issuance costs	7	8
Net carrying amount of the liability component	743	742
2028 Notes \| Senior notes
Debt Instrument [Line Items]
Debt, gross	350	350
Unamortized debt discount and issuance costs	5	5
Net carrying amount of the liability component	345	345
Convertible Notes, net \| Convertible notes \| Carrying Amount
Debt Instrument [Line Items]
Debt, gross	230	230
Unamortized debt discount and issuance costs	(19)	(23)
Net carrying amount of the liability component	211	207
Convertible Notes, net \| Convertible notes
Debt Instrument [Line Items]
Debt, gross	230	230
Unamortized debt issuance costs	(3)	(3)
Net carrying amount of the liability component	$ 211	207
Debt, interest rate, effective percentage	4.70%
Corporate credit facility \| Term Loan
Debt Instrument [Line Items]
Debt, gross	$ 889	893
Unamortized debt discount and issuance costs	(11)	(12)
Net carrying amount of the liability component	878	881
Corporate credit facility \| Revolving Corporate Credit Facility
Debt Instrument [Line Items]
Debt, gross	0	30
Unamortized debt issuance costs	0	(3)
Net carrying amount of the liability component	$ 0	$ 27

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 835
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long term debt and finance lease obligations, gross.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long term debt and finance lease obligations, net of unamortized discount and debt issuance costs.

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