Debt under Vehicle Programs and Borrowing Arrangements - Repurchase Facility (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Amount Outstanding	$ 19,188	$ 17,536
Repurchase Facility
Debt Instrument [Line Items]
Interest rate		6.64%
Amount Outstanding	$ 215	$ 116
Repurchase Facility Maturing January 2026 | Repurchase Facility
Debt Instrument [Line Items]
Interest rate	5.63%
Tenor	1 month
Amount Outstanding	$ 11
Repurchase Facility Maturing Febraury 2026 | Repurchase Facility
Debt Instrument [Line Items]
Interest rate	4.98%
Tenor	3 months
Amount Outstanding	$ 40
Repurchase Facility Maturing March 2026 (1) | Repurchase Facility
Debt Instrument [Line Items]
Interest rate	4.79%
Tenor	3 months
Amount Outstanding	$ 26
Repurchase Facility Maturing March 2026 (2) | Repurchase Facility
Debt Instrument [Line Items]
Interest rate	4.79%
Tenor	3 months
Amount Outstanding	$ 40
Repurchase Facility Maturing May 2026 | Repurchase Facility
Debt Instrument [Line Items]
Interest rate	5.68%
Tenor	6 months
Amount Outstanding	$ 98