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Receivables - Allowance for Credit Losses Activity (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Retail      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Opening balance $ 299 $ 326 $ 383
Provision 113 44 53
Charge-offs, net of recoveries (56) (51) (85)
Foreign currency translation and other (10) (20) (25)
Ending balance 381 299 326
Retail | Adoption of ASC 326      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Opening balance 35    
Ending balance   35  
Retail | Adjusted Balance      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Opening balance 334    
Ending balance   334  
Wholesale      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Opening balance 159 164 200
Provision 27 12 (5)
Charge-offs, net of recoveries (14) (18) (15)
Foreign currency translation and other 11 1 (16)
Ending balance 174 159 $ 164
Wholesale | Adoption of ASC 326      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Opening balance (9)    
Ending balance   (9)  
Wholesale | Adjusted Balance      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Opening balance $ 150    
Ending balance   $ 150