BASIS OF PRESENTATION - Other Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,990	$ 2,097
Accumulated Amortization	(1,312)	(1,447)
Net Book Value	678	650
Other intangible assets with indefinite lives	721	718
Gross Carrying Amount	2,711	2,815
Net Book Value	1,399	1,368
Trade names
Finite-Lived Intangible Assets [Line Items]
Other intangible assets with indefinite lives	105	105
Contracts
Finite-Lived Intangible Assets [Line Items]
Other intangible assets with indefinite lives	612	609
Other
Finite-Lived Intangible Assets [Line Items]
Other intangible assets with indefinite lives	4	4
Capitalized software costs
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,581	1,712
Accumulated Amortization	(1,110)	(1,205)
Net Book Value	471	507
Contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	323	294
Accumulated Amortization	(125)	(164)
Net Book Value	198	130
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	86	91
Accumulated Amortization	(77)	(78)
Net Book Value	$ 9	$ 13