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Accounts Receivable (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Accounts Receivable, after Allowance for Credit Loss [Abstract]    
Trade customers $ 1,265 $ 1,086
Related parties 2 9
Allowance for credit losses (18) (17)
Accounts receivable from trade customers, net 1,249 1,078
Federal and state taxes 43 92
Other 35 44
Accounts receivable, net $ 1,327 $ 1,214