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(Tables)
 9 Months Ended
Sep. 30, 2019
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
September 30,
 
Nine Months Ended
September 30,
 
2019
 
2018
 
2019
 
2018
Operating revenues
$
24

 
$
25

 
$
72

 
$
72

Operating and maintenance
2

 
—

 
4

 
2

General and administrative
3

 
6

 
12

 
17

Interest expense — related company
6

 
5

 
15

 
8