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Related Party Transactions (Tables)
 9 Months Ended
Sep. 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
September 30,		Nine Months Ended
September 30,
2021202020212020
Operating revenues
$23 $23 $68 $67 
Operating and maintenance
5 3 13 12 
General and administrative
6 5 19 18 
Interest expense — related company
4 8 14 25