Employee Benefit Plans - PacifiCorp - Defined Contribution Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost	$ 41	$ 40	$ 39
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Interest Crediting Rates for Cash Balance Plan, Second Year	2.25%	2.94%	3.54%
Interest Crediting Rates for Cash Balance Plan, Fourth Year	2.65%	3.02%	3.56%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 13
Defined Benefit Plan, Plan Assets, Payment for Settlement	$ 0	$ 22
Pension Plan [Member] | UNITED STATES | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest Crediting Rates for Cash Balance Plan, Fourth Year	2.40%	2.70%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 4
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Life Insurance, Corporate or Bank Owned, Amount	303	$ 252
Supplemental Employee Retirement Plan [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Life Insurance, Corporate or Bank Owned, Amount	$ 61	$ 57