Commitments and Contingencies - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Mar. 31, 2022
Commitments And Contingencies [Line Items]
Operating Lease Liability	$ 98,000,000		$ 98,000,000
Lease description			Lease terms may contain renewal and extension options or early termination features. Generally, these options do not impact the lease term because TMCC is not reasonably certain that it will exercise the options. These lease agreements do not impose restrictions on our ability to pay dividends, engage in debt or equity financing transactions or enter into further lease agreements, nor do they have residual value guarantees. We exclude from our Consolidated Balance Sheets leases with a term equal to one year or less and do not separate non-lease components from our real estate leases.
Indemnification provisions	0		$ 0		$ 0
Putnam and Gibson Counties [Member] | Performance Guarantee [Member]
Commitments And Contingencies [Line Items]
Guarantees of affiliate pollution control and solid waste disposal bonds	100,000,000		$ 100,000,000		100,000,000
TMNA [Member]
Commitments And Contingencies [Line Items]
Lease agreement expiration date			2032-08
Total operating lease expense, including payments to affiliates	10,000,000	$ 8,000,000	$ 25,000,000	$ 25,000,000
TMCC-affiliated companies [Member]
Commitments And Contingencies [Line Items]
Operating Lease Liability	78,000,000		78,000,000		$ 84,000,000
TMCC-affiliated companies [Member] | Putnam and Gibson Counties [Member] | Performance Guarantee [Member]
Commitments And Contingencies [Line Items]
Guarantees of affiliate pollution control and solid waste disposal bonds	100,000,000		100,000,000
TMCC-affiliated companies [Member] | Putnam and Gibson Counties [Member] | Performance Guarantee [Member] | 2028 [Member]
Commitments And Contingencies [Line Items]
Guarantees of affiliate pollution control and solid waste disposal bonds	20,000,000		20,000,000
TMCC-affiliated companies [Member] | Putnam and Gibson Counties [Member] | Performance Guarantee [Member] | 2029 [Member]
Commitments And Contingencies [Line Items]
Guarantees of affiliate pollution control and solid waste disposal bonds	50,000,000		50,000,000
TMCC-affiliated companies [Member] | Putnam and Gibson Counties [Member] | Performance Guarantee [Member] | 2030 [Member]
Commitments And Contingencies [Line Items]
Guarantees of affiliate pollution control and solid waste disposal bonds	10,000,000		10,000,000
TMCC-affiliated companies [Member] | Putnam and Gibson Counties [Member] | Performance Guarantee [Member] | 2031 [Member]
Commitments And Contingencies [Line Items]
Guarantees of affiliate pollution control and solid waste disposal bonds	10,000,000		10,000,000
TMCC-affiliated companies [Member] | Putnam and Gibson Counties [Member] | Performance Guarantee [Member] | 2032 [Member]
Commitments And Contingencies [Line Items]
Guarantees of affiliate pollution control and solid waste disposal bonds	$ 10,000,000		$ 10,000,000