v2.4.0.6
Intangible Assets, Net Intangible Assets, Net (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Intangible Assets [Line Items]      
Gross Carrying Amount $ 15,908   $ 15,830
Accumulated Amortization 6,396   5,991
Net Carrying Amount 9,512   9,839
Non amortizing in process research and development 175   175
Total Intangible Assets, Gross 16,083   16,005
Total Intangible Assets, Net 9,687   10,014
Amortization Expense Related to Intangible Assets 398 503  
Future Amortization Expense [Abstract]      
2013 1,229    
2014 611    
2015 313    
2016 314    
2017 311    
Technology and intellectual property [Member]
      
Intangible Assets [Line Items]      
Gross Carrying Amount 7,763   7,751
Accumulated Amortization 5,393   5,081
Net Carrying Amount 2,370   2,670
Brands [Member]
      
Intangible Assets [Line Items]      
Gross Carrying Amount 5,440   5,410
Accumulated Amortization 414   374
Net Carrying Amount 5,026   5,036
Dealer Network and Customer Relationships [Member]
      
Intangible Assets [Line Items]      
Gross Carrying Amount 2,169   2,138
Accumulated Amortization 354   322
Net Carrying Amount 1,815   1,816
Favorable contracts [Member]
      
Intangible Assets [Line Items]      
Gross Carrying Amount 519   514
Accumulated Amortization 220   200
Net Carrying Amount 299   314
Other [Member]
      
Intangible Assets [Line Items]      
Gross Carrying Amount 17   17
Accumulated Amortization 15   14
Net Carrying Amount $ 2   $ 3