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		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Instruments [Line Items]
Beginning balance	$ 68	$ 101	$ 62	$ 96
Changes in fair value recognized in net regulatory assets	(49)	16	(21)	(12)
Net (losses) gains reclassified to operating revenue	1	(11)	14	(27)
Net Gains (Losses) Reclassified To Cost Of Domestic Regulated Electric	(11)	(25)	(46)	24
Ending balance	$ 9	$ 81	$ 9	$ 81