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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 2021
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,
2021202020212020
Operating revenues
$22 $22 $45 $44 
Operating and maintenance
5 2 8 5 
General and administrative
7 6 13 13 
Interest expense — related company
4 8 10 17