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Goodwill and Intangible Assets Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]      
Intangible Assets, Gross Carrying Amount $ 14,176 $ 14,036  
Intangible Assets, Accumulated Amortization 9,785 9,460  
Intangible Assets, Net Carrying Amount 4,391 4,576  
Amortization Expense 328 327 $ 676
Estimated Amortization Expense, 2017 200    
Estimated Amortization Expense, 2018 200    
Estimated Amortization Expense, 2019 200    
Estimated Amortization Expense, 2020 200    
Estimated Amortization Expense, 2021 200    
Technology and Intellectual Property [Member]      
Finite-Lived Intangible Assets [Line Items]      
Intangible Assets, Gross Carrying Amount 8,399 8,263  
Intangible Assets, Accumulated Amortization 7,940 7,838  
Intangible Assets, Net Carrying Amount 459 425  
Brands [Member]      
Finite-Lived Intangible Assets [Line Items]      
Intangible Assets, Gross Carrying Amount 4,421 4,427  
Intangible Assets, Accumulated Amortization 933 808  
Intangible Assets, Net Carrying Amount 3,488 3,619  
Dealer network, customer relationships and other      
Finite-Lived Intangible Assets [Line Items]      
Intangible Assets, Gross Carrying Amount 1,356 1,346  
Intangible Assets, Accumulated Amortization 912 814  
Intangible Assets, Net Carrying Amount $ 444 $ 532