Income Taxes - Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	21.00%	35.00%
Income tax credits	(32.00%)	(30.00%)	(20.00%)
Effective Income Tax Rate Reconciliation Regulatory Differences	(6.00%)	(8.00%)	(1.00%)
State income tax, net of federal income tax benefit	(5.00%)	(6.00%)	3.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	(0.00%)	(4.00%)	(31.00%)
Income tax effect of foreign income	(2.00%)	(3.00%)	(5.00%)
Equity income	0.00%	(1.00%)	2.00%
Other, net	(1.00%)	(1.00%)	(1.00%)
Effective income tax rate	(25.00%)	(30.00%)	(22.00%)
Production Tax Credit Carryforwards [Abstract]
Years Eligible For Renewable Energy Production Tax Credit	10 years
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred state	$ 127	$ 131	$ (100)
PacifiCorp [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	21.00%	35.00%
Income tax credits	(3.00%)	(7.00%)	(5.00%)
Effective Income Tax Rate Reconciliation Regulatory Differences	(2.00%)	(0.00%)	1.00%
State income tax, net of federal income tax benefit	(3.00%)	(4.00%)	(3.00%)
Effective Income Tax Rate Reconciliation, Amortization of Excess Deferred Income Taxes, Percent	(11.00%)	(17.00%)	(0.00%)
Other, net	(1.00%)	0.00%	(2.00%)
Effective income tax rate	7.00%	1.00%	32.00%
Production Tax Credit Carryforwards [Abstract]
Years Eligible For Renewable Energy Production Tax Credit	10 years
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred state	$ (4)	$ 9	$ (15)

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

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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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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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Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

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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 changes in the income tax rates.

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