Allowance for Credit Losses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Analysis of ending balance of finance receivables
Finance receivables, net	$ 79,167us-gaap_NotesReceivableNet		$ 81,111us-gaap_NotesReceivableNet
Financial Services [Member]
Allowance for credit losses
Beginning balance	321	357
Charge-offs	(79)	(77)
Recoveries	32	39
Provision for credit losses	49	16
Other	(9)	(1)
Ending balance	314	334
Analysis of ending balance of allowance for credit losses
Collective impairment allowance	292	308
Specific impairment allowance	22	26
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	85,491	83,128
Specifically evaluated for impairment	522	516
Financing Receivable, Gross	86,013	83,644	86,462
Finance receivables, net	85,699	83,310	86,141
Financing And Loans And Leases Receivable Allowance	355	358
Financial Services [Member] \| Consumer [Member]
Allowance for credit losses
Beginning balance	305	327
Charge-offs	(80)	(75)
Recoveries	30	34
Provision for credit losses	53	23
Other	(7)	(2)
Ending balance	301	307
Analysis of ending balance of allowance for credit losses
Collective impairment allowance	280	284
Specific impairment allowance	21	23
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	53,135	50,116
Specifically evaluated for impairment	396	424
Financing Receivable, Gross	53,531	50,540
Finance receivables, net	53,230	50,233
Financial Services [Member] \| Non-consumer [Member]
Allowance for credit losses
Beginning balance	16	30
Charge-offs	1	(2)
Recoveries	2	5
Provision for credit losses	(4)	(7)
Other	(2)	1
Ending balance	13	27
Analysis of ending balance of allowance for credit losses
Collective impairment allowance	12	24
Specific impairment allowance	1	3
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	32,356	33,012
Specifically evaluated for impairment	126	92
Financing Receivable, Gross	32,482	33,104
Finance receivables, net	$ 32,469	$ 33,077

Financing And Loans And Leases Receivable Allowance

No definition available.

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- Definition

Reflects other additions and reductions to the finance receivable allowance, which are not reflected elsewhere or separately disclosed.

+ References

No definition available.

+ Details

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- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (g)

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- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(4)

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- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (h)

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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))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Subparagraph 3

-Article 9

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- Definition

Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3)

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Article 5

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- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

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-Number 210

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-Paragraph 11

-Article 9

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-Topic 942

-SubTopic 225

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-Paragraph 1

-Subparagraph (SX 210.9-04.11)

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-Subparagraph (c)(2)

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