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Goodwill and Other Intangibles - Other Intangible Assets and Related Accumulated Amortization (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Schedule Of Indefinite And Finite Lived Intangible Assets [Line Items]    
Other intangible assets subject to amortization, gross $ 2,418 $ 2,285
Other intangible assets subject to amortization, accumulated amortization 1,919 1,752
Other intangible assets subject to amortization, net 499 533
Total other intangible assets, gross 2,691 2,558
Other intangible assets not subject to amortization 1,919 1,752
Total other intangible assets, net $ 772 806
Minimum    
Schedule Of Indefinite And Finite Lived Intangible Assets [Line Items]    
Other intangible assets subject to amortization, weighted average life 5 years  
Maximum    
Schedule Of Indefinite And Finite Lived Intangible Assets [Line Items]    
Other intangible assets subject to amortization, weighted average life 25 years  
Trademarks    
Schedule Of Indefinite And Finite Lived Intangible Assets [Line Items]    
Total other intangible assets, gross $ 273 273
Total other intangible assets, net $ 273 273
Dealer networks    
Schedule Of Indefinite And Finite Lived Intangible Assets [Line Items]    
Other intangible assets subject to amortization, weighted average life 15 years  
Other intangible assets subject to amortization, gross $ 311 320
Other intangible assets subject to amortization, accumulated amortization 241 224
Other intangible assets subject to amortization, net 70 96
Patents, concessions, licenses and other    
Schedule Of Indefinite And Finite Lived Intangible Assets [Line Items]    
Other intangible assets subject to amortization, gross 2,107 1,965
Other intangible assets subject to amortization, accumulated amortization 1,678 1,528
Other intangible assets subject to amortization, net $ 429 $ 437
Patents, concessions, licenses and other | Minimum    
Schedule Of Indefinite And Finite Lived Intangible Assets [Line Items]    
Other intangible assets subject to amortization, weighted average life 5 years  
Patents, concessions, licenses and other | Maximum    
Schedule Of Indefinite And Finite Lived Intangible Assets [Line Items]    
Other intangible assets subject to amortization, weighted average life 25 years