Commitments and contingencies.

No definition available.

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- Definition

Provision for indemnification.

+ References

No definition available.

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Period Type:	instant

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248

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- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

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- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

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Commitments and Contingencies - Additional Information (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Commitments And Contingencies [Line Items]
Minimum lease commitments	$ 144,000,000	$ 162,000,000
Indemnification provisions	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
TMNA [Member]
Commitments And Contingencies [Line Items]
Lease agreement expiration date	Aug. 31, 2032
Total rental expense, including payments to affiliates	$ 30,000,000	30,000,000	$ 27,000,000
TMCC-affiliated companies [Member]
Commitments And Contingencies [Line Items]
Minimum lease commitments	97,000,000	$ 105,000,000
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
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
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
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
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
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