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Receivables, Allowance for Credit Losses and Credit Quality of Receivables - Components of Notes Receivable, Net (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Notes receivable $ 22     $ 25    
Notes receivable allowance (69) $ (84) $ (86) (82) $ (70) $ (42)
Long-term receivables, net 656     $ 636    
Notes receivable            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Notes receivable 725   722      
Notes receivable allowance (69)   (86)      
Long-term receivables, net 656   636      
UNITED STATES | Notes receivable            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Notes receivable 478   443      
Notes receivable allowance (26)   (43)      
International [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Notes receivable allowance (43) $ (42) (43)      
International [Member] | Notes receivable            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Notes receivable 247   279      
Notes receivable allowance (43)   (43)      
Balances Over 90 days Past Due | Notes receivable            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Notes receivable 141   140      
Notes receivable allowance for balances over 90 days past due (35)   (50)      
Notes receivable, net, balances over 90 days past due 106   90      
Balances Over 90 days Past Due | UNITED STATES | Notes receivable            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Notes receivable 81   88      
Notes receivable allowance for balances over 90 days past due (11)   (26)      
Balances Over 90 days Past Due | International [Member] | Notes receivable            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Notes receivable 60   52      
Notes receivable allowance for balances over 90 days past due $ (24)   $ (24)