REVENUE - Schedule of Disaggregation of Revenue by Product Line (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Lease & related maintenance and rental revenue	$ 1,013	$ 976	$ 2,936	$ 2,887
Revenue	3,433	3,171	9,906	9,490
FMS
Disaggregation of Revenue [Line Items]
Revenue	1,616	1,465	4,636	4,379
ChoiceLease \| FMS
Disaggregation of Revenue [Line Items]
Lease & related maintenance and rental revenue	913	875	2,676	2,613
Commercial rental \| FMS
Disaggregation of Revenue [Line Items]
Lease & related maintenance and rental revenue	244	242	684	700
SelectCare and other \| FMS
Disaggregation of Revenue [Line Items]
Lease & related maintenance and rental revenue	187	165	551	517
Fuel services revenue \| FMS
Disaggregation of Revenue [Line Items]
Revenue	$ 272	$ 183	$ 725	$ 549

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details