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Accounts Receivable (Accounts Receivable) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Less: Allowance for doubtful accounts $ (148) $ (130)
Accounts receivable, net 519 553
Retail And Wholesale [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 592 608
Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 75 $ 75