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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 6,043 $ 5,998  
Accumulated Amortization 2,723 2,520  
Net Carrying Amount 3,320 3,478  
Amortization expense 144 202 $ 247
Estimated amortization expense, 2021 160    
Estimated amortization expense, 2022 160    
Estimated amortization expense, 2023 160    
Estimated amortization expense, 2024 160    
Estimated amortization expense, 2025 160    
Technology and intellectual property      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 762 734  
Accumulated Amortization 542 533  
Net Carrying Amount 220 201  
Brands      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 4,300 4,298  
Accumulated Amortization 1,444 1,285  
Net Carrying Amount 2,856 3,013  
Dealer network, customer relationships and other      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 981 966  
Accumulated Amortization 737 702  
Net Carrying Amount $ 244 $ 264