Financial Instruments (Net investment hedges in foreign operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Net investment hedges in foreign operation
Hedge ineffectiveness gain (loss)	$ (32)	$ (16)
Financial Services Revenue	5,961us-gaap_FinancialServicesRevenue	9,858us-gaap_FinancialServicesRevenue
Discontinued Operations [Member]
Net investment hedges in foreign operation
Gain (loss) reclassified from AOCI into earnings	(189)	13
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net investment hedges in foreign operation
Financial Services Revenue	(944)	134
Net Investment Hedge [Member]
Net investment hedges in foreign operation
Hedge ineffectiveness gain (loss)	(44)	(142)
Foreign Exchange Contract [Member] \| Net Investment Hedge [Member]
Net investment hedges in foreign operation
Gain (loss) recognized in AOCI	4,989	(1,033)
Gain (loss) reclassified from AOCI into earnings	785	10
Currency Translation Adjustment [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Net investment hedges in foreign operation
Financial Services Revenue	$ 974	$ (3)

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4D

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624177-113959

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

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- Definition

Amount of gain (loss) from the ineffectiveness of the hedge.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

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- Definition

The aggregate financial services revenue and operating interest income earned during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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