Debt Under Vehicle Programs and Borrowing Arrangements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Debt under vehicle programs	$ 17,239	$ 17,536
Repurchase Facility
Debt Instrument [Line Items]
Debt interest, tenor period	180 days
Debt under vehicle programs	$ 116
Interest rate	6.30%
Securities pledged as collateral	$ 195