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Accounts Receivable
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Accounts Receivable Accounts Receivable
Accounts receivable consist of the following at December 31:
 
 
2019
 
2018
Trade customers
 
$
948

 
$
969

Related parties
 
12

 
6

Allowance for doubtful accounts
 
(22
)
 
(23
)
 
 
938

 
952

Federal and state taxes
 
59

 
57

Other
 
39

 
28

Accounts receivable, net
 
$
1,036

 
$
1,037