Debt Under Vehicle Programs and Borrowing Arrangements - Schedule of Contractual Maturities (Details) - Deferred Financing Fees $ in Millions	Mar. 31, 2026 USD ($)
Debt Instrument [Line Items]
Within 1 year	$ 4,421
Between 1 and 2 years	5,034
Between 2 and 3 years	5,468
Between 3 and 4 years	2,048
Between 4 and 5 years	1,015
Thereafter	482
Total	18,468
Bank And Bank-Sponsored Facilities
Debt Instrument [Line Items]
Within 1 year	700
Between 1 and 2 years	1,900
Between 3 and 4 years	$ 2,000
Short-term debt, weighted average interest rate, at point in time	4.56%