LEASES - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Operating Leases
Lease assets, non-current	$ 207	$ 197
Lease liabilities, current	35	34
Lease liabilities, non-current	205	198
Total lease liabilities	$ 240	$ 232
Weighted average remaining lease term (in years)	8 years 4 months 20 days	9 years 4 months 20 days
Weighted average discount rate	5.40%	5.70%
Finance Leases
Lease assets, non-current	$ 18	$ 17
Lease liabilities, current	5	5
Lease liabilities, non-current	32	33
Total lease liabilities	$ 37	$ 38
Weighted average remaining lease term (in years)	7 years 8 months 15 days	8 years 4 months 20 days
Weighted average discount rate	7.90%	8.40%
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property and equipment, net	Property and equipment, net
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current portion of notes payable, finance leases, and commercial bank financing	Current portion of notes payable, finance leases, and commercial bank financing
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term debt	Long-term debt