Income Taxes - PacifiCorp - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	(3.00%)	1.00%	1.00%
Income tax credits	(20.00%)	(14.00%)	(11.00%)
Other, net	(2.00%)	(2.00%)	(2.00%)
Effective income tax rate	(22.00%)	14.00%	16.00%
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	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	3.00%	3.00%	3.00%
Income tax credits	(5.00%)	(6.00%)	(6.00%)
Other, net	(1.00%)	(1.00%)	0.00%
Effective income tax rate	32.00%	31.00%	32.00%
Deferred Tax Assets, Tax Credit Carryforwards [Abstract]
Years Eligible For Renewable Energy Production Tax Credit	10 years

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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-Publisher FASB
-Name Accounting Standards Codification
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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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