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Receivables, Allowance for Credit Losses and Credit Quality of Receivables - Allowance for Notes Receivable Activity (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Allowance for notes receivable      
Financing Receivable, Allowance for Credit Loss $ (86) $ (42)  
Allowance for Loan and Lease Losses, Period Increase (Decrease) $ 28    
Balances Over 90 days Past Due      
Allowance for notes receivable      
Financing Receivable, Percent Past Due 15.00%   14.00%
International [Member]      
Allowance for notes receivable      
Financing Receivable, Allowance for Credit Loss $ (43)    
UNITED STATES      
Allowance for notes receivable      
Financing Receivable, Allowance for Credit Loss (43)    
Notes receivable      
Allowance for notes receivable      
Financing Receivable, Allowance for Credit Loss (86)    
Provision for Loan, Lease, and Other Losses 0 (28)  
Financing Receivable, Allowance for Credit Loss, Recovery 2 0  
Financing Receivable, Allowance for Credit Loss (84) $ (70)  
Notes receivable | International [Member]      
Allowance for notes receivable      
Financing Receivable, Allowance for Credit Loss (43)    
Provision for Loan, Lease, and Other Losses 0    
Financing Receivable, Allowance for Credit Loss, Recovery 1    
Financing Receivable, Allowance for Credit Loss (42)    
Notes receivable | UNITED STATES      
Allowance for notes receivable      
Provision for Loan, Lease, and Other Losses 0    
Financing Receivable, Allowance for Credit Loss, Recovery 1    
Financing Receivable, Allowance for Credit Loss $ (42)