Risk Management and Hedging Activities - PacifiCorp - Not Designated as Hedging Contracts (Details) - PacifiCorp [Member] - Not Designated as Hedging Instrument [Member] - Commodity derivative [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Instruments [Line Items]
Beginning balance	$ 84	$ 78	$ 62	$ 96
Changes in fair value recognized in net regulatory assets	(6)	26	28	(28)
Net (losses) gains reclassified to operating revenue	5	6	13	(16)
Net Gains (Losses) Reclassified To Cost Of Domestic Regulated Electric	(15)	(9)	(35)	49
Ending balance	$ 68	$ 101	$ 68	$ 101