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Related Party Transactions (Tables)
 3 Months Ended
Mar. 31, 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
March 31,
20212020
Operating revenues
$23 $22 
Operating and maintenance
3 3 
General and administrative
6 7 
Interest expense — related company
6 9