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Accounts Receivable (Schedule Of Accounts Receivable) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Trade customers $ 1,086 $ 948
Related Party 9 12
Allowance for doubtful accounts (17) (22)
Accounts Receivable from trade customers, net 1,078 938
Federal and state taxes 92 59
Other 44 39
Accounts receivable, net $ 1,214 $ 1,036