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Receivables - Carrying Amount of Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Restricted Receivables $ 13,235 $ 13,606
Retail note and finance lease receivables    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Restricted Receivables 6,224 6,340
Wholesale    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Restricted Receivables $ 7,011 $ 7,266