REVENUE - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Lease & related maintenance and rental revenue	$ 3,937	$ 4,174	$ 3,995
Contracted not recognized revenue	2,800	2,300
Initial direct costs of leases	117	126
Sales commissions expense	47	44	44
Start-up Costs
Disaggregation of Revenue [Line Items]
Capitalized start-up costs	84	73
Start-up contract amortization expense	30	28	23
Maintenance Services
Disaggregation of Revenue [Line Items]
Lease & related maintenance and rental revenue	$ 963	$ 1,000	$ 1,000