Employee Benefit Plans Employee Benefit Plans - PacifiCorp (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1	$ 5	$ 6
Interest cost	6	6	16	20
Expected return on plan assets	(9)	(10)	(25)	(30)
Net amortization	(1)	0	(5)	(3)
Net periodic benefit cost	(3)	(3)	(9)	(7)
PacifiCorp [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	1	1
Interest cost	2	3	7	9
Expected return on plan assets	(3)	(6)	(10)	(16)
Net amortization	0	1	0	1
Net periodic benefit cost	(1)	(2)	(2)	(5)
UNITED STATES | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	4	11	12
Interest cost	23	27	69	82
Expected return on plan assets	(35)	(38)	(105)	(115)
Net amortization	8	8	25	24
Net periodic benefit cost	0	1	0	3
UNITED STATES | PacifiCorp [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	9	11	27	33
Expected return on plan assets	(14)	(17)	(42)	(50)
Net amortization	4	3	13	9
Net periodic benefit cost	$ (1)	$ (3)	$ (2)	$ (8)