Income Taxes - PAC (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	21.00%	21.00%	21.00%
State income tax, net of federal income tax benefit	3.00%	(1.00%)	6.00%	6.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(43.00%)	(19.00%)	(35.00%)	(29.00%)
Effects of ratemaking	(9.00%)	(2.00%)	(5.00%)	(3.00%)
Other, net	1.00%	(1.00%)	0.00%	(1.00%)
Effective income tax rate	36.00%	(2.00%)	27.00%	19.00%
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal 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%	21.00%
State income tax, net of federal income tax benefit	3.00%	4.00%	3.00%	4.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(3.00%)	(5.00%)	(4.00%)	(5.00%)
Effects of ratemaking	(3.00%)	(4.00%)	(2.00%)	(4.00%)
Effective Income Tax Rate Reconciliation, Amortization of excess deferred income taxes	(18.00%)	0.00%	(7.00%)	0.00%
Other, net	(1.00%)	(1.00%)	0.00%	(2.00%)
Effective income tax rate	(1.00%)	15.00%	11.00%	14.00%
Effective income tax reconciliation, Amortization of excess deferred income taxes, Dollar			$ 49
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit			10 years

Effective Income Tax Rate Reconciliation, Amortization of excess deferred income taxes

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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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