Summary of Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Foreign Currency [Abstract]
Foreign Currency Transaction Gain (Loss), before Tax	$ (510,000,000)	$ (349,000,000)	$ (426,000,000)
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Finite-Lived Intangible Assets, Net	133,000,000	85,000,000
Amortization of Intangible Assets	15,000,000	11,000,000	10,000,000
Finite Lived Intangible Assets Forecasted Amortization Maximum Year 1	25,000,000
Finite Lived Intangible Assets Forecasted Amortization Maximum Year 2	25,000,000
Finite Lived Intangible Assets Forecasted Amortization Maximum Year 3	25,000,000
Finite Lived Intangible Assets Forecasted Amortization Maximum Year 4	25,000,000
Finite Lived Intangible Assets Forecasted Amortization Maximum Year 5	25,000,000
Revenue Recognition [Abstract]
Average Term Deferred Revenue Is Recognized	11 months
Selected Other Costs [Abstract]
Engineering, research, and development	6,900,000,000	6,400,000,000	5,500,000,000
Advertising	4,300,000,000	4,400,000,000	4,000,000,000
Financial Services [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization of Intangible Assets	0	0	0
Retail and Lease Supplements [Abstract]
Earned Interest Supplements And Residual Support Revenue	1,400,000,000	1,500,000,000	1,600,000,000
Amount of Reduction in Depreciation Expense On Property Subject To Or Held For Lease	1,300,000,000	946,000,000	850,000,000
Automotive [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization of Intangible Assets	15,000,000	11,000,000	10,000,000
Maximum [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization of Intangible Assets	$ 25,000,000