Derivative Financial Instruments and Hedging Activities Income Effect of Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Maximum Length of Time Hedged in Cash Flow Hedge	2 years
Automotive [Member]
Derivative [Line Items]
Gain/(Loss) Recognized in Income	$ 224	$ (193)	$ (583)
Automotive [Member] \| Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Foreign currency exchange contracts [Member]
Derivative [Line Items]
Gain/(Loss) Recorded in OCI	(271)	317	(371)
Gain/(Loss) Reclassified from AOCI to Income	78	(80)	(377)
Gain/(Loss) Recognized in Income	0	(3)	1
Automotive [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign currency exchange contracts [Member]
Derivative [Line Items]
Gain/(Loss) Recognized in Income	193	(26)	(138)
Automotive [Member] \| Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Gain/(Loss) Recognized in Income	(47)	(84)	(65)
Automotive [Member] \| Not Designated as Hedging Instrument [Member] \| Other - warrants [Member]
Derivative [Line Items]
Gain/(Loss) Recognized in Income	0	0	(4)
Financial Services [Member]
Derivative [Line Items]
Gain/(Loss) Recognized in Income	512	110	(122)
Financial Services [Member] \| Designated as Hedging Instrument [Member]
Derivative [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	407	(658)	228
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(387)	614	(212)
Financial Services [Member] \| Designated as Hedging Instrument [Member] \| Fair Value Hedging [Member] \| Interest rate contracts [Member]
Derivative [Line Items]
Net interest settlements and accruals excluded from the assessment of hedge effectiveness	304	254	177
Ineffectiveness	20	(44)	16
Financial Services [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign currency exchange contracts [Member]
Derivative [Line Items]
Gain/(Loss) Recognized in Income	68	21	(70)
Financial Services [Member] \| Not Designated as Hedging Instrument [Member] \| Interest rate contracts [Member]
Derivative [Line Items]
Gain/(Loss) Recognized in Income	(41)	(33)	(14)
Financial Services [Member] \| Not Designated as Hedging Instrument [Member] \| Cross-currency interest rate swap contracts [Member]
Derivative [Line Items]
Gain/(Loss) Recognized in Income	161	(88)	(150)
Financial Services [Member] \| Not Designated as Hedging Instrument [Member] \| Other [Member]
Derivative [Line Items]
Gain/(Loss) Recognized in Income	$ 0	$ 0	$ (81)

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

Reference 1: 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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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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-Publisher FASB

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

+ References

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

-Publisher FASB

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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.

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The net gain (loss) included in earnings for the period relating to components of the gain (loss) on interest rate fair value hedging instruments excluded from the assessment of fair value hedge effectiveness.

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The net gain (loss) recognized in earnings during the period due to the ineffectiveness on interest rate fair value hedges.

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Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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