Debt Under Vehicle Programs and Borrowing Arrangements - Schedule of Repurchase Facilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Amount Outstanding	$ 18,391	$ 19,188
Repurchase Facility
Debt Instrument [Line Items]
Amount Outstanding	$ 258
Repurchase Facility Maturing May 2026 | Repurchase Facility
Debt Instrument [Line Items]
Interest Rate	4.76%
Tenor	3 months
Amount Outstanding	$ 40
Repurchase Facility Maturing June 2026 (1) | Repurchase Facility
Debt Instrument [Line Items]
Interest Rate	4.80%
Tenor	3 months
Amount Outstanding	$ 25
Repurchase Facility Maturing June 2026 (2) | Repurchase Facility
Debt Instrument [Line Items]
Interest Rate	4.80%
Tenor	3 months
Amount Outstanding	$ 39
Repurchase Facility Maturing June 2026 (3) | Repurchase Facility
Debt Instrument [Line Items]
Interest Rate	4.77%
Tenor	3 months
Amount Outstanding	$ 24
Repurchase Facility Maturing June 2026 (4) | Repurchase Facility
Debt Instrument [Line Items]
Interest Rate	4.77%
Tenor	3 months
Amount Outstanding	$ 44
Repurchase Facility Maturing June 2026 (5) | Repurchase Facility
Debt Instrument [Line Items]
Interest Rate	5.71%
Tenor	3 months
Amount Outstanding	$ 86