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(Tables)
 6 Months Ended
Jun. 30, 2020
Related Party Transactions [Abstract]  
Related Party Transactions [table text block]
The following table provides a summary of the related party activity included in our consolidated statements of operations:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2020
 
2019
 
2020
 
2019
Operating revenues
$
22

 
$
24

 
$
44

 
$
48

Operating and maintenance
2

 
1

 
5

 
2

General and administrative
6

 
5

 
13

 
9

Interest expense — related company
8

 
5

 
17

 
9