Debt Under Vehicle Programs and Borrowing Arrangements (Schedule of Contractual Maturities) (Details) - Deferred Financing Fees $ in Millions	Mar. 31, 2025 USD ($)
Debt Instrument [Line Items]
Within 1 year	$ 3,394
Between 1 and 2 years	6,495
Between 2 and 3 years	3,175
Between 3 and 4 years	2,655
Between 4 and 5 years	1,427
Thereafter	165
Total	17,311
Bank And Bank-Sponsored Facilities
Debt Instrument [Line Items]
Within 1 year	600
Between 1 and 2 years	3,000
Between 2 and 3 years	100
Between 3 and 4 years	$ 100
Short-term debt, weighted average interest rate, at point in time	4.49%