SEGMENT REPORTING - Summary of Segment Revenue and Net Before Tax Information by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue:
Lease & related maintenance and rental revenue	$ 3,937	$ 4,174	$ 3,995
Revenues	11,783	12,011	9,663
Earnings before tax, before reconciling items	922	1,264	759
Intangible amortization expense	(35)	(37)
Non-operating pension costs, net	(40)	(11)	1
Other items impacting comparability, net	21	(2)	(32)
Earnings from continuing operations before income taxes	618	1,216	693
SCS
Revenue:
Revenues	4,875	4,720	3,155
Operating Segments | FMS
Revenue:
Revenues	5,930	6,327	5,680
Earnings before tax, before reconciling items	665	1,057	665
Operating Segments | FMS | ChoiceLease
Revenue:
Lease & related maintenance and rental revenue	3,181	3,101	3,064
Operating Segments | FMS | Commercial rental
Revenue:
Lease & related maintenance and rental revenue	1,178	1,338	1,077
Operating Segments | FMS | SelectCare and other
Revenue:
Lease & related maintenance and rental revenue	694	624	538
Operating Segments | FMS | FMS Europe
Revenue:
Lease & related maintenance and rental revenue	0	150	262
Operating Segments | FMS | Fuel services revenue
Revenue:
Revenues	877	1,114	739
Operating Segments | SCS
Revenue:
Revenues	4,875	4,720	3,155
Earnings before tax, before reconciling items	231	218	123
Operating Segments | DTS
Revenue:
Revenues	1,785	1,786	1,457
Earnings before tax, before reconciling items	121	103	49
Eliminations
Revenue:
Revenues	(807)	(822)	(629)
Earnings before tax, before reconciling items	(95)	(114)	(78)
Segment Reconciling Items
Revenue:
Unallocated Central Support Services	(72)	(83)	(69)
Intangible amortization expense	(35)	(37)	(8)
Non-operating pension costs, net	(40)	(11)	1
Other items impacting comparability, net	$ (157)	$ 83	$ 10