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Related Party Transactions (Tables)
 6 Months Ended
Jun. 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
June 30,
 
Six Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
Operating revenues
$
3

 
$
4

 
$
7

 
$
9

Operating and maintenance
2

 
3

 
4

 
7

General and administrative
5

 
7

 
11

 
14

Interest income — affiliates
4

 
7

 
8

 
14