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Jointly-owned Plant (Tables)
12 Months Ended
Dec. 31, 2020
Jointly-owned Plant [Abstract]  
Schedule of Jointly Owned Utility Plants [Table Text Block]
As of December 31, 2020, PGE had the following investments in jointly-owned plant (dollars in millions):
 PGE
Share
In-service DatePlant
In-service
Accumulated
Depreciation*
Construction
Work In
Progress
Colstrip20.00 %1986$566 $387 $
Pelton/Round Butte66.67 %1958/1964283 82 
Total$849 $469 $14 
*    Excludes AROs and accumulated asset retirement removal costs.