Debt Under Vehicle Programs and Borrowing Arrangements (Schedule of Contractual Maturities) (Details) - Deferred Financing Fees $ in Millions	Mar. 31, 2024 USD ($)
Debt Instrument [Line Items]
Within 1 year	$ 2,090
Between 1 and 2 years	3,803
Between 2 and 3 years (d)	6,780
Between 3 and 4 years (e)	2,770
Between 4 and 5 years	2,365
Thereafter	1,481
Total	19,289
Bank And Bank-Sponsored Facilities
Debt Instrument [Line Items]
Within 1 year	200
Between 1 and 2 years	1,300
Between 2 and 3 years (d)	3,500
Between 3 and 4 years (e)	$ 100