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
	Mar. 31, 2020	Mar. 31, 2019
Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Instruments [Line Items]
Beginning balance	$ 62	$ 96
Changes in fair value recognized in net regulatory assets	34	(54)
Net (losses) gains reclassified to operating revenue	8	(22)
Net Gains (Losses) Reclassified To Cost Of Domestic Regulated Electric	(20)	58
Ending balance	$ 84	$ 78