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Related Party Transactions (Tables)
 9 Months Ended
Sep. 30, 2017
Related Party Transactions [Abstract]  
Related Party Transactions [table text block]
The following table provides a summary of the related party activity included in the consolidated statements of operations:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
Operating revenues
$
11

 
$
4

 
$
18

 
$
13

Operating and maintenance
1

 
4

 
5

 
11

General and administrative
7

 
6

 
18

 
20

Interest income — affiliates
1

 
9

 
9

 
23