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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2019
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 tables provide a summary of related party activity included in our consolidated statements of operations:
 
Years Ended December 31,
 
2019
 
2018
 
2017
Operating revenues
$
95

 
$
97

 
$
43

Operating and maintenance
6

 
3

 
7

General and administrative
18

 
24

 
23

Interest income — affiliates
—

 
—

 
10

Interest expense — affiliates
25

 
13

 
—