Financial Services Finance Receivables - Aging (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Financing Receivables, Aging [Line Items]
Number Of Days After Which Finance Receivable Is Considered Past Due	31 days
Financing Receivable, Gross	$ 101,961	$ 96,674	$ 95,736
Consumer [Member]
Financing Receivables, Aging [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	23	21
Financing Receivable, Recorded Investment, Past Due	821	947
Financing Receivable, Recorded Investment, Current	67,332	64,391
Financing Receivable, Gross	68,153	65,338	62,185
Consumer [Member] \| Financing Receivables, 31 to 60 Days Past due [Member]
Financing Receivables, Aging [Line Items]
Financing Receivable, Recorded Investment, Past Due	643	760
Consumer [Member] \| Financing Receivables, 61 to 90 Days Past due [Member]
Financing Receivables, Aging [Line Items]
Financing Receivable, Recorded Investment, Past Due	106	114
Consumer [Member] \| Financing Receivables, 91 to 120 Days Past due [Member]
Financing Receivables, Aging [Line Items]
Financing Receivable, Recorded Investment, Past Due	36	34
Consumer [Member] \| Financing Receivables, Greater than 120 Days Past due [Member]
Financing Receivables, Aging [Line Items]
Financing Receivable, Recorded Investment, Past Due	36	39
Non-consumer [Member]
Financing Receivables, Aging [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	1	0
Financing Receivable, Recorded Investment, Past Due	133	107
Financing Receivable, Recorded Investment, Current	33,675	31,229
Financing Receivable, Gross	$ 33,808	$ 31,336	$ 33,551

Threshold Period For Past Due Finance Receivables

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
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: 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=66008989&loc=d3e5111-111524

+ Details

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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=66008989&loc=SL6953401-111524

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: 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=66008989&loc=SL6953401-111524

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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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

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