Debt and Credit Facilities - Additional Information (Details) - USD ($)	Jun. 30, 2023	Mar. 31, 2023
364 Day Credit Agreement Expiring 2024 [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	$ 5,000,000,000
Credit facilities amount outstanding	0	$ 0
Three Year Agreement Expiring 2026 [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 2028 [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	8,000,000,000
Credit facilities amount outstanding	5,000,000,000.0	5,500,000,000
Total Committed Bank Credit Facilities [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	4,400,000,000
Credit facilities amount outstanding	0	0
Committed Bank Credit Facility Expiring 2024 [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	2,000,000,000
Committed Bank Credit Facility Expiring 2025 [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	300,000,000
Committed Bank Credit Facility Expiring 2026 [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	1,800,000,000
Committed Bank Credit Facility Expiring 2027 [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	300,000,000
Three Year Syndicated Bank Credit Facility Expiring 2026 [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	5,000,000,000.0
Credit facilities amount outstanding	$ 0	$ 0