Employee Benefit Plans Employee Benefit Plans - PacifiCorp (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 1
Interest cost	5	6
Expected return on plan assets	(5)	(9)
Net amortization	(1)	(1)
Net periodic benefit cost	1	(3)
PacifiCorp [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	2	3
Expected return on plan assets	(2)	(4)
Net amortization	0	0
Net periodic benefit cost	0	(1)
UNITED STATES | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	3
Interest cost	20	23
Expected return on plan assets	(33)	(35)
Net amortization	6	9
Net periodic benefit cost	0	0
UNITED STATES | PacifiCorp [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	7	9
Expected return on plan assets	(13)	(14)
Net amortization	5	5
Net periodic benefit cost	$ (1)	$ 0