Income Taxes - PacifiCorp - Summary of Operating Loss Carryforwards (Details) - State and Local Jurisdiction [Member] $ in Millions	Dec. 31, 2020 USD ($)
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 7,190	[1]
Deferred Tax Assets, Operating Loss Carryforwards	409
Deferred Tax Assets, Tax Credit Carryforwards	28
PacifiCorp [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	1,138
Deferred Tax Assets, Operating Loss Carryforwards	53
Deferred Tax Assets, Tax Credit Carryforwards	$ 20

[1] The federal net operating loss carryforwards relate principally to net operating loss carryforwards of subsidiaries that are tax residents in both the United States and the United Kingdom. The federal net operating loss carryforwards were generated prior to Berkshire Hathaway Inc.'s ownership and will begin to expire in 2021.