Finance Receivables, Net (Finance Receivable Credit Quality Indicators) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Current	$ 65,939	$ 65,180
30-59 days past due	475	469
60-89 days past due	102	92
90 days or greater past due	51	33
Total Finance Receivables	66,567us-gaap_NotesReceivableGross	65,774us-gaap_NotesReceivableGross
Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	49,684	48,828
30-59 days past due	467	459
60-89 days past due	100	90
90 days or greater past due	51	33
Total Finance Receivables	50,302	49,410
Commercial Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	511	432
30-59 days past due	8	6
60-89 days past due	2	1
90 days or greater past due	0	0
Total Finance Receivables	521	439
Wholesale [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	9,226	9,436
30-59 days past due	0	0
60-89 days past due	0	0
90 days or greater past due	0	0
Total Finance Receivables	9,226	9,436
Wholesale [Member] \| Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Finance Receivables	7,993	8,129
Wholesale [Member] \| Credit Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Finance Receivables	1,137	1,282
Wholesale [Member] \| At Risk [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Finance Receivables	60	24
Wholesale [Member] \| Default [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Finance Receivables	36	1
Real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	4,665	4,653
30-59 days past due	0	4
60-89 days past due	0	1
90 days or greater past due	0	0
Total Finance Receivables	4,665	4,658
Real estate [Member] \| Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Finance Receivables	3,782	3,791
Real estate [Member] \| Credit Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Finance Receivables	842	855
Real estate [Member] \| At Risk [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Finance Receivables	37	12
Real estate [Member] \| Default [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Finance Receivables	4	0
Working capital [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	1,853	1,831
30-59 days past due	0	0
60-89 days past due	0	0
90 days or greater past due	0	0
Total Finance Receivables	1,853	1,831
Working capital [Member] \| Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Finance Receivables	1,643	1,642
Working capital [Member] \| Credit Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Finance Receivables	176	158
Working capital [Member] \| At Risk [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Finance Receivables	32	25
Working capital [Member] \| Default [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Finance Receivables	$ 2	$ 6

Financing receivables that are less than 60 days past due but more than 29 days past due.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524

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- Definition

Financing receivables that are less than 90 days past due but more than 59 days past due.

+ References

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- Definition

Financing receivables that are current.

+ References

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- Definition

Financing receivables that are equal to or greater than 90 days past due.

+ References

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- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(3))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Subparagraph 3

-Article 9

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