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, 2019	Mar. 31, 2018
Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Instruments [Line Items]
Beginning balance	$ 96	$ 101
Changes in fair value recognized in net regulatory assets	(54)	28
Net (losses) gains reclassified to operating revenue	(22)	7
Net Gains (Losses) Reclassified To Cost Of Domestic Regulated Electric	58	(14)
Ending balance	$ 78	$ 122