Summary of Significant Accounting Policies - PacifiCorp - Income Taxes (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets and Liabilities [Line Items]
Federal statutory income tax rate		21.00%		21.00%	21.00%	35.00%
Regulatory Assets		$ 3,440		$ 2,881
Regulatory Liabilities		7,475		7,311
Deferred Income Tax Charge [Member]
Deferred Tax Assets and Liabilities [Line Items]
Regulatory Assets		283	[1]	223
Deferred Income Tax Charge [Member]
Deferred Tax Assets and Liabilities [Line Items]
Regulatory Liabilities	[2]	$ 3,600		$ 3,611
PacifiCorp [Member]
Deferred Tax Assets and Liabilities [Line Items]
Federal statutory income tax rate		21.00%		21.00%	21.00%	35.00%
Regulatory Assets		$ 1,395		$ 1,123
Regulatory Liabilities		2,842		2,969
Deferred investment tax credit		12		11
PacifiCorp [Member] | Deferred Income Tax Charge [Member]
Deferred Tax Assets and Liabilities [Line Items]
Regulatory Liabilities	[3]	$ 1,463		$ 1,653
Tax Cuts and Jobs Act of 2017 [Member]
Deferred Tax Assets and Liabilities [Line Items]
Federal statutory income tax rate						21.00%

[1] Amounts primarily represent income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

[2] Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

[3] Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable of being passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.