Debt and Credit Facilities - Additional Information (Details) - USD ($)	Mar. 31, 2025	Mar. 31, 2024
364 Day Credit Agreement Expiring 2026 [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	$ 5,000,000,000
Credit facilities amount outstanding	0	$ 0
Three Year Agreement Expiring 2028 [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	5,000,000,000
Credit facilities amount outstanding	0	0
Five Year Syndicated Bank Credit Facility Expiring 2030 [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	5,000,000,000
Credit facilities amount outstanding	0	0
Revolving Securitization Facility [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	8,500,000,000
Credit facilities amount outstanding	5,800,000,000	3,400,000,000
Total Committed Bank Credit Facilities [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	4,100,000,000
Credit facilities amount outstanding	0	0
Committed Bank Credit Facility Expiring March 31, 2026 [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	2,200,000,000
Committed Bank Credit Facility Expiring March 31, 2028 [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	1,900,000,000
Three Year Revolving Credit Facility Expiring March 31, 2027 [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	5,000,000,000
Credit facilities amount outstanding	$ 0	$ 0