DEBT - Debt Balances, Net of Unamortized Debt Issuance Costs (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt, gross	$ 2,817
Net carrying amount of the liability component	2,778	$ 2,216
Carrying Amount
Debt Instrument [Line Items]
Net carrying amount of the liability component	2,778	2,216
Finance leases	9	14
2026 Notes \| Senior Notes
Debt Instrument [Line Items]
Debt, gross	750	750
Unamortized debt 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 issuance costs	(5)	(5)
Net carrying amount of the liability component	345	345
Convertible Notes \| Convertible Notes
Debt Instrument [Line Items]
Debt, gross	230	230
Unamortized debt issuance costs	(3)	(3)
Net carrying amount of the liability component	$ 209	207
Debt, interest rate, effective percentage	4.70%
Convertible Notes \| Convertible Notes \| Carrying Amount
Debt Instrument [Line Items]
Debt, gross	$ 230	230
Unamortized debt discount and issuance costs	(21)	(23)
Net carrying amount of the liability component	209	207
Corporate Credit Facility \| Term Loan
Debt Instrument [Line Items]
Debt, gross	891	893
Unamortized debt discount and issuance costs	(12)	(12)
Net carrying amount of the liability component	879	881
Corporate Credit Facility \| Revolving Corporate Credit Facility
Debt Instrument [Line Items]
Debt, gross	596	30
Unamortized debt issuance costs	(3)	(3)
Net carrying amount of the liability component	$ 593	$ 27
Variable Interest Entity \| Warehouse Credit Facility \| Secured Debt
Debt Instrument [Line Items]
Debt, interest rate, effective percentage	2.30%

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=109500613&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=114775744&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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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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=77888426&loc=SL77918701-209980

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&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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