Commitments and Contingencies (Details) (USD $)	12 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Commitment:
Credit facilities with vehicle and industrial equipment dealers	$ 7,396,000,000	$ 6,804,000,000
Less: Funded commitments	6,290,000,000	5,758,000,000
Unfunded commitments	1,106,000,000	1,046,000,000
Minimum lease commitments	74,000,000	81,000,000
Total unfunded commitments	1,180,000,000	1,127,000,000
Guarantor Obligations [Line Items]
Total commitments and guarantees	1,280,000,000	1,227,000,000
Wholesale financing demand note facilities	11,475,000,000	10,258,000,000
Less: Funded facilites	8,284,000,000	6,616,000,000
Unfunded wholesale financing demand note facilities	3,191,000,000	3,642,000,000
Future minimum lease payments under non-cancelable operating leases
2014	19,000,000
2015	18,000,000
2016	16,000,000
2017	11,000,000
2018	7,000,000
Thereafter	3,000,000
Total	74,000,000	81,000,000
Facility lease commitments with affiliate	37,000,000	44,000,000
Rental expense payments to affiliates	22,000,000	23,000,000	23,000,000
Unsecured lending commitment percentage	2.00%
Affiliate Pollution Control and Solid Waste Disposal Bonds [Member]
Guarantor Obligations [Line Items]
Guaranteed Bond Obligations	100,000,000	100,000,000
Guaranty Fee	78,000
Affiliate Pollution Control and Solid Waste Disposal Bonds [Member] \| 2028 [Member]
Guarantor Obligations [Line Items]
Guaranteed Bond Obligations	20,000,000
Affiliate Pollution Control and Solid Waste Disposal Bonds [Member] \| 2029 [Member]
Guarantor Obligations [Line Items]
Guaranteed Bond Obligations	50,000,000
Affiliate Pollution Control and Solid Waste Disposal Bonds [Member] \| 2030 [Member]
Guarantor Obligations [Line Items]
Guaranteed Bond Obligations	10,000,000
Affiliate Pollution Control and Solid Waste Disposal Bonds [Member] \| 2031 [Member]
Guarantor Obligations [Line Items]
Guaranteed Bond Obligations	10,000,000
Affiliate Pollution Control and Solid Waste Disposal Bonds [Member] \| 2032 [Member]
Guarantor Obligations [Line Items]
Guaranteed Bond Obligations	$ 10,000,000

Amount of commitments the company entered into.

No definition available.

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Aggregate amount of commitments and guarantor obligations.

+ References

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- Definition

Represent the amount committed by the enttiy to provide wholesale financing to vehicle and industrial euqipment as of the balance sheet date

+ References

No definition available.

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- Definition

The outstanding amount as of the balance sheet date that the entity must finance to satisfy the terms of credit facility agreement with vehicle and industrial equipment dealers. This represents monies advanced to dealers and reflected as a receivable.

+ References

No definition available.

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- Definition

Gurantor obligations for debt issued by the third party.

+ References

No definition available.

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- Definition

The total of future contractually required payments on leases defined as operating due to related parties.

+ References

No definition available.

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

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- Definition

This represents commitments that were entered into, but have yet to be drawn upon.

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No definition available.

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- Definition

The outstanding amount as of the balance sheet date that the entity may or may not finance to satisfy the terms of credit facility agreement with vehicle and industrial equipment dealers.

+ References

No definition available.

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- Definition

The approximate percentage of financing commitments provided to multi-franchise dealer organizations for wholesale, working capital, real estate, and business acquisitions that the entity deems unsecured.

+ References

No definition available.

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- Definition

The floor amount as of the balance sheet date that the entitiy commited to finance to satisfy the terms of credit facility agreement with vehicle and industrial equipment dealers.

+ References

No definition available.

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Represents the outstanding amount as of the balance sheet date of loans made to provide wholesale financing to vehicle and industrial equipment dealers. It is payable upon demand. This represents monies advanced to dealers and reflected as a receivable.

+ References

No definition available.

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This item represents the portion of monthly guaranty fees collected representing the interest imputed and recognized under the prospective interest method on the present value of the contractually stipulated guarantee payments at inception of the contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-SubTopic 225

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

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-Name Statement of Financial Accounting Standard (FAS)

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Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing after the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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