Income Taxes - PacifiCorp - Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	6.00%	(3.00%)	1.00%
Income tax credits	(30.00%)	(20.00%)	(14.00%)
Other, net	(1.00%)	(1.00%)	(2.00%)
Effective income tax rate	(30.00%)	(22.00%)	14.00%
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
Years Eligible For Renewable Energy Production Tax Credit	10 years
PacifiCorp [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	4.00%	3.00%	3.00%
Effective Income Tax Rate Reconciliation, Amortization of Excess Deferred Income Taxes, Percent	(17.00%)	(0.00%)	(0.00%)
Income tax credits	(7.00%)	(5.00%)	(6.00%)
Other, net	0.00%	(1.00%)	(1.00%)
Effective income tax rate	1.00%	32.00%	31.00%
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
Years Eligible For Renewable Energy Production Tax Credit	10 years
Tax Cuts and Jobs Act of 2017 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%
Tax Cuts and Jobs Act of 2017 [Member] \| PacifiCorp [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
Amortization of Excess Deferred Income Taxes, Amount	$ 127

Amortization of Excess Deferred Income Taxes, Amount

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Effective Income Tax Rate Reconciliation, Amortization of Excess Deferred Income Taxes, Percent

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Schedule of Effective Income Tax Rate Reconciliation [Line Items]

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The number of years from its in-service date that each wind-powered generating facility is eligible for federal renewable energy production tax credits.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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