DEBT - Debt Balances, Net of Unamortized Debt Issuance Costs (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt, gross	$ 2,689
Finance Leases	83	$ 8
Debt and lease obligation	2,631	2,680
2025 Notes \| Senior notes
Debt Instrument [Line Items]
Long-term debt, gross	250	500
Unamortized debt discount and issuance costs	(2)	(6)
Long-term debt	248	494
2026 Notes \| Senior notes
Debt Instrument [Line Items]
Long-term debt, gross	0	750
Unamortized debt discount and issuance costs	0	(6)
Long-term debt	0	744
2028 Notes \| Senior notes
Debt Instrument [Line Items]
Long-term debt, gross	350	350
Unamortized debt discount and issuance costs	(4)	(4)
Long-term debt	346	346
2029 Notes \| Senior notes
Debt Instrument [Line Items]
Long-term debt, gross	500	0
Unamortized debt discount and issuance costs	(7)	0
Long-term debt	493	0
Term Loan, net \| Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	784	884
Unamortized debt discount and issuance costs	(8)	(11)
Long-term debt	776	873
2022 Convertible Notes \| Convertible Notes
Debt Instrument [Line Items]
Long-term debt, gross	230	230
Unamortized debt discount and issuance costs	(6)	(15)
Long-term debt	224	215
2026 Convertible Notes
Debt Instrument [Line Items]
Unamortized debt discount and issuance costs	(15)
2026 Convertible Notes \| Convertible Notes
Debt Instrument [Line Items]
Long-term debt, gross	575	0
Unamortized debt discount and issuance costs	(114)	0
Long-term debt	$ 461	$ 0

Amount of short-term and long-term debt and lease obligation.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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