Employee Benefit Plans Employee Benefit Plans - PacifiCorp (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1	$ 6	$ 6
Interest cost	6	7	20	19
Expected return on plan assets	(10)	(9)	(30)	(31)
Net amortization	0	(3)	(3)	(9)
Net periodic benefit cost	(3)	(4)	(7)	(15)
PacifiCorp [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	1	1
Interest cost	3	3	9	9
Expected return on plan assets	(6)	(5)	(16)	(16)
Net amortization	1	(1)	1	(4)
Net periodic benefit cost	(2)	(3)	(5)	(10)
UNITED STATES | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	5	12	15
Interest cost	27	26	82	78
Expected return on plan assets	(38)	(41)	(115)	(123)
Net amortization	8	8	24	23
Net periodic benefit cost	1	(2)	3	(7)
UNITED STATES | PacifiCorp [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	11	11	33	32
Expected return on plan assets	(17)	(18)	(50)	(54)
Net amortization	3	3	9	10
Net periodic benefit cost	$ (3)	$ (4)	$ (8)	$ (12)