Description of Business, Basis of Presentation, and Significant Accounting Policies - Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investment in operating leases, net	$ 7,991	$ 7,967	$ 8,126	$ 8,582	$ 9,085	$ 9,509	$ 9,890	$ 10,218
Other assets	10,660	9,947	9,949	9,420	9,418	9,612	9,155	9,142
Retained earnings	$ 270	284	208	111	91	148	(15)	(205)
As Originally Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investment in operating leases, net		8,318	8,374	8,731	9,171	9,569	9,930	10,236
Other assets		9,907	9,853	9,348	9,395	9,601	9,153	9,144
Retained earnings		$ 595	$ 360	$ 188	154	$ 197	$ 23	$ (185)
Adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investment in operating leases, net					(86)
Other assets					23
Retained earnings					$ (63)