Income Taxes - PacifiCorp - Component of Net Deferred Income Tax Liability (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities		$ 1,610	$ 1,674
AROs		306	232
Other		590	527
Total deferred income tax assets, net		2,938	2,892
Property-related items		(10,439)	(10,185)
Regulatory assets		(631)	(656)
Other		(384)	(222)
Total deferred income tax liabilities		(12,591)	(11,939)
Net deferred income tax liability		(9,653)	(9,047)
PacifiCorp [Member]
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities		731	752
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits		83	91
Deferred Tax Assets, Derivative Instruments And Unamortized Contract Values		33	45
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards, State and Local		70	77
AROs		61	53
Other		68	56
Total deferred income tax assets, net		1,046	1,074
Property-related items		(3,312)	(3,335)
Regulatory assets		(276)	(273)
Other		(21)	(9)
Total deferred income tax liabilities		(3,609)	(3,617)
Net deferred income tax liability		(2,563)	$ (2,543)
Tax Cuts and Jobs Act of 2017 [Member]
Deferred Tax Assets and Liabilities [Line Items]
Net deferred income tax liability	[1]	$ (7,115)

[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.