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Goodwill and Intangible Assets Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 13,704 $ 14,066  
Accumulated Amortization 9,712 9,773  
Net Carrying Amount 3,992 4,293  
Amortization expense 278 325 $ 324
Estimated amortization expense, 2018 175    
Estimated amortization expense, 2019 175    
Estimated amortization expense, 2020 175    
Estimated amortization expense, 2021 175    
Estimated amortization expense, 2022 175    
Technology and Intellectual Property [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 8,092 8,399  
Accumulated Amortization 7,735 7,940  
Net Carrying Amount 357 459  
Brands [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 4,302 4,311  
Accumulated Amortization 1,044 921  
Net Carrying Amount 3,258 3,390  
Dealer network, customer relationships and other      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 1,310 1,356  
Accumulated Amortization 933 912  
Net Carrying Amount $ 377 $ 444