Finance Receivables, Net (Contractrual Maturities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from direct finance leases	$ 235	$ 213
Estimated unguaranteed residual values related to direct finance leases	6
Dealer products portfolio segment accounts on nonaccrual status	69	211
Retail receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2014	13,913
2015	12,524
2016	10,025
2017	7,037
2018	3,679
Thereafter	993
Total	48,171
Dealer financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2014	11,497
2015	1,268
2016	707
2017	607
2018	568
Thereafter	348
Total	$ 14,995

Notes receivables excluding estimated unguaranteed residual values in direct financing lease.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Receivables to customers expected to be collected in or after five years from the balance sheet date.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Receivables to customers expected to be collected in less than five years but greater than four years from the balance sheet date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Receivables to customers expected to be collected in less than four years but greater than three years from the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Receivables to customers expected to be collected within one year from the balance sheet date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Receivables to customers expected to be collected in less than three years but greater than two years from the balance sheet date.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Receivables to customers expected to be collected in less than two years but greater than one year from the balance sheet date.

+ References

No definition available.

+ Details

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- Details

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- Definition

Amount of remaining payments as of the balance sheet date that lessees are obligated to make or can be required to make under direct financing leases, including any guarantee of residual value and executory costs. The amount also includes any guaranteed rental payments by an unrelated third-party provided that are financially capable of making such payments.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 23

-Subparagraph a(i)(a)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6952072&loc=d3e45377-112738

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

The estimate of the lease property's economic value at the end of the direct financing lease term excluding any amounts guaranteed by either the lessee or a third-party.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=6952072&loc=d3e45377-112738

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 23

-Subparagraph a(i)(b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5111-111524

+ Details

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