Income Taxes - PacifiCorp - Component of Net Deferred Income Tax Liability (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities		$ 1,674	$ 1,707
AROs		232	223
Other		459	450
Total deferred income tax assets, net		2,892	3,417
Property-related items		(10,185)	(9,950)
Regulatory assets		(656)	(651)
Other		(222)	(215)
Total deferred income tax liabilities		(11,939)	(11,659)
Net deferred income tax liability		(9,047)	(8,242)
PacifiCorp [Member]
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities		752	756
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits		91	84
Deferred Tax Assets, Derivative Instruments And Unamortized Contract Values		45	48
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards, State and Local		77	83
AROs		53	50
Other		56	50
Total deferred income tax assets, net		1,074	1,071
Property-related items		(3,335)	(3,381)
Regulatory assets		(273)	(261)
Other		(9)	(11)
Total deferred income tax liabilities		(3,617)	(3,653)
Net deferred income tax liability		(2,543)	$ (2,582)
Tax Cuts and Jobs Act of 2017 [Member]
Deferred Tax Assets and Liabilities [Line Items]
Net deferred income tax liability	[1]	$ (7,115)

[1] (1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse. Amount includes regulatory liabilities with an indeterminate life of $82 million as of December 31, 2018. See Note 9 for further discussion of 2017 Tax Reform impacts.