Annual report pursuant to Section 13 and 15(d)

Accounts Receivable Accounts Receivable (Accounts Receivable) (Details)

v3.19.3.a.u2
Accounts Receivable Accounts Receivable (Accounts Receivable) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
installment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]      
Accounts receivable, gross $ 1,936 $ 1,899  
Less allowance for doubtful accounts (123) (112)  
Accounts receivable, net 1,813 1,787  
Installment sales plan      
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]      
Accounts receivable, gross 1,586 1,533  
Credit Card Receivable [Member]      
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]      
Accounts receivable, gross 247 269  
Other receivables [Member]      
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]      
Accounts receivable, gross 103 97  
SG&A      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance income from company branded credit card issued by financial institution $ 124 $ 118 $ 105
Minimum | Installment sales plan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of installments plan permits for customers | installment 2    
Maximum | Installment sales plan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of installments plan permits for customers | installment 5