Risk Management and Hedging Activities - PacifiCorp - Not Designated as Hedging Contracts (Details) - Not Designated as Hedging Instrument [Member] - Commodity Contract [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]
Beginning balance	$ 250	$ 223	$ 182
Changes In Fair Value Derivatives Recognized In Regulatory Assets Or Liabilities, Net	(30)	128	96
Net Gains (Losses) Reclassified To Operating Revenue	(5)	1	(32)
Ending balance	148	250	223
PacifiCorp [Member]
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]
Beginning balance	133	85	55
Changes In Fair Value Derivatives Recognized In Regulatory Assets Or Liabilities, Net	(27)	82	45
Net Gains (Losses) Reclassified To Operating Revenue	10	40	(4)
Net Gains (Losses) Reclassified To Cost Of Domestic Regulated Electric	(43)	(74)	(11)
Ending balance	$ 73	$ 133	$ 85