Property, Plant and Equipment, Net - PacifiCorp (Details) - PacifiCorp [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross		$ 26,757	$ 25,813
Public utility accumulated depreciation and amortization		(8,360)	(8,026)
Public Utilities Property, Plant And Equipment In Service, Net		18,397	17,787
Public Utilities, Property, Plant and Equipment, Construction Work in Progress		629	932
Public Utilities, Property, Plant and Equipment, Net		$ 19,026	$ 18,719
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service		2.90%	3.00%	2.80%
Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments		$ 155	$ 143
Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments, Related Accumulated Depreciation		$ 112	107
Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life		10 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life		58 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life		20 years
Finite-Lived Intangible Asset, Useful Life	[1]	5 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life		5 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life		67 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life		75 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life		70 years
Finite-Lived Intangible Asset, Useful Life	[1]	62 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life		60 years
Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross		$ 12,164	11,932
Electric Transmission [Member]
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross		5,914	5,392
Electric Distribution [Member]
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross		6,408	6,197
Other Intangible Assets [Member]
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross	[1]	875	879
Other Capitalized Property Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross		$ 1,396	1,413
Computer Software, Intangible Asset [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life		5 years
Computer Software, Intangible Asset [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life		10 years
Service Life [Member]
Property, Plant and Equipment [Line Items]
Change in Accounting Estimates, Impact on Period of Change			$ 35

[1] (1)Computer software costs included in intangible plant are initially assigned a depreciable life of 5 to 10 years.