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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2020
Related Party Transactions [Abstract]  
Related Party Transactions [table text block]
Accounts receivable from related companies reflected on the consolidated balance sheets primarily related to services provided to ET, ETO and other affiliates. Accounts payable to related companies and advance from affiliates reflected on the consolidated balance sheets related to various services provided by ETO and other affiliates.
The following table provides a summary of related party activity included in our consolidated statements of operations:
 Years Ended December 31,
202020192018
Operating revenues
$90 $95 $97 
Operating and maintenance
10 6 3 
General and administrative
23 18 24 
Interest expense — related company32 25 13