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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Instruments [Line Items]
Beginning balance	$ 78	$ 122	$ 96	$ 101
Changes in fair value recognized in net regulatory assets	26	6	(28)	34
Net (losses) gains reclassified to operating revenue	6	(1)	(16)	6
Net Gains (Losses) Reclassified To Cost Of Domestic Regulated Electric	(9)	(11)	49	(25)
Ending balance	$ 101	$ 116	$ 101	$ 116