Risk Management and Hedging Activities - PacifiCorp - Not Designated as Hedging Contracts (Details) - PacifiCorp [Member] - Not Designated as Hedging Instrument [Member] - Commodity Contract [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]
Beginning balance	$ 62	$ 96	$ 101
Changes In Fair Value Derivatives Recognized In Regulatory Assets Or Liabilities, Net	(11)	(37)	12
Net Gains (Losses) Reclassified To Operating Revenue	3	(34)	(68)
Net Gains (Losses) Reclassified To Cost Of Domestic Regulated Electric	(37)	37	51
Ending balance	$ 17	$ 62	$ 96