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Commitments and Contingencies Commitments and Contingencies - PacifiCorp - Hydroelectric (Details) - PacifiCorp [Member] - Klamath Hydroelectric System [Member]
$ in Millions
 6 Months Ended
Jun. 30, 2017
USD ($)
Hydroelectric [Line Items]  
Dam removal cost limit $ 200
OREGON  
Hydroelectric [Line Items]  
Dam removal cost limit 184
CALIFORNIA  
Hydroelectric [Line Items]  
Additional dam removal costs, California bond measure 250
Dam removal cost limit $ 16