Finance Receivables - Aging Analysis (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold Period For Past Due Finance Receivables	31 days
Finance Receivables Aging Analysis [Abstract]
Financing Receivables	$ 101,369	$ 97,196	$ 93,036
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	24	16
Finance Receivables Aging Analysis [Abstract]
Total past due	839	881
Current	64,270	59,068
Financing Receivables	65,109	59,949	59,124
Consumer Portfolio Segment [Member] \| 31-60 Days Past Due [Member]
Finance Receivables Aging Analysis [Abstract]
Total past due	652	708
Consumer Portfolio Segment [Member] \| 61-90 Days Past Due [Member]
Finance Receivables Aging Analysis [Abstract]
Total past due	112	108
Consumer Portfolio Segment [Member] \| 91-120 Days Past Due [Member]
Finance Receivables Aging Analysis [Abstract]
Total past due	36	27
Consumer Portfolio Segment [Member] \| Greater Than 120 Days Past Due [Member]
Finance Receivables Aging Analysis [Abstract]
Total past due	39	38
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	1
Finance Receivables Aging Analysis [Abstract]
Total past due	71	116
Current	36,189	37,131
Financing Receivables	$ 36,260	$ 37,247	$ 33,912

Finance Receivables Aging Analysis [Abstract]

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Threshold Period For Past Due Finance Receivables

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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=49124121&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=49124121&loc=SL6953401-111524

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

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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

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