Finance Receivables - Aging Analysis (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number Of Days After Which Finance Receivable Is Considered Past Due	90 days
Finance Receivables Aging Analysis [Abstract]
Financing Receivables	$ 86,812us-gaap_NotesReceivableGross	$ 87,236us-gaap_NotesReceivableGross	$ 84,380us-gaap_NotesReceivableGross
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	11	17
Finance Receivables Aging Analysis [Abstract]
31-60 days past due	552	718
61-90 days past due	64	97
91-120 days past due	21	29
Greater than 120 days past due	49	52
Total past due	686	896
Current	52,845	53,200
Financing Receivables	53,531	54,096
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		3
Finance Receivables Aging Analysis [Abstract]
Total past due	112	117
Current	33,169	33,023
Financing Receivables	$ 33,281	$ 33,140

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Financing receivables that are less than 61 days past due but 31 or more days past due.

+ References

No definition available.

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- Definition

Financing receivables that are less than 91 days past due but 61 or more days past due.

+ References

No definition available.

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- Definition

Financing receivables that are less than 121 days past due but 91 or more days past due.

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No definition available.

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- Definition

Financing receivables that are greater than 120 days past due.

+ References

No definition available.

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- Definition

The number of days after which finance receivables are considered to be past due.

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No definition available.

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- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ 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=35738203&loc=d3e5111-111524

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- Definition

Financing receivables that are current.

+ References

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

Recorded Investment in financing receivables that are past due at the balance sheet date.

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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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