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Accounts Receivable (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Accounts Receivable, after Allowance for Credit Loss [Abstract]    
Trade customers $ 968 $ 948
Related parties 4 12
Allowance for credit losses (15) (22)
Accounts receivable from trade customers, net 957 938
Federal and state taxes 297 59
Other 39 39
Accounts receivable, net $ 1,293 $ 1,036