Income Taxes - PacifiCorp - Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	21.00%	21.00%	35.00%
State income tax, net of federal income tax benefit	(3.00%)	5.00%	6.00%
Effective Income Tax Rate Reconciliation Regulatory Differences	(3.00%)	(6.00%)	(8.00%)
Income tax credits	(16.00%)	(32.00%)	(30.00%)
Other, net	(1.00%)	(1.00%)	(1.00%)
Effective income tax rate	4.00%	(25.00%)	(30.00%)
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%	21.00%	21.00%	35.00%
State income tax, net of federal income tax benefit	3.00%	3.00%	4.00%
Effective Income Tax Rate Reconciliation Regulatory Differences	(22.00%)	(13.00%)	(17.00%)
Income tax credits	(13.00%)	(3.00%)	(7.00%)
Other, net	0.00%	(1.00%)	0.00%
Effective income tax rate	(11.00%)	7.00%	1.00%
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
Amortization of Excess Deferred Income Taxes, Amount	$ 118	$ 91	$ 127
Tax Cuts and Jobs Act of 2017 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate				21.00%

Amortization of Excess Deferred Income Taxes, Amount

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the tax effect of certain temporary differences due to state utility rate regulation.

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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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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