Intangible Assets, Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Intangible Assets [Line Items]
Gross Carrying Amount	$ 15,908		$ 15,908		$ 15,830
Accumulated Amortization	7,179		7,179		5,991
Net Carrying Amount	8,729		8,729		9,839
Non amortizing in process research and development	175		175		175
Total Intangible Assets, Gross	16,083		16,083		16,005
Total Intangible Assets, Net	8,904		8,904		10,014
Amortization Expense Related to Intangible Assets	389	430	1,179	1,396
Future Amortization Expense [Abstract]
2013	1,229		1,229
2014	612		612
2015	314		314
2016	315		315
2017	312		312
Technology and intellectual property [Member]
Intangible Assets [Line Items]
Gross Carrying Amount	7,761		7,761		7,751
Accumulated Amortization	6,005		6,005		5,081
Net Carrying Amount	1,756		1,756		2,670
Brands [Member]
Intangible Assets [Line Items]
Gross Carrying Amount	5,413		5,413		5,410
Accumulated Amortization	487		487		374
Net Carrying Amount	4,926		4,926		5,036
Dealer Network and Customer Relationships [Member]
Intangible Assets [Line Items]
Gross Carrying Amount	2,166		2,166		2,138
Accumulated Amortization	409		409		322
Net Carrying Amount	1,757		1,757		1,816
Favorable contracts [Member]
Intangible Assets [Line Items]
Gross Carrying Amount	551		551		514
Accumulated Amortization	261		261		200
Net Carrying Amount	290		290		314
Other [Member]
Intangible Assets [Line Items]
Gross Carrying Amount	17		17		17
Accumulated Amortization	17		17		14
Net Carrying Amount	$ 0		$ 0		$ 3