Employee Benefit Plans - PacifiCorp - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	$ 0	$ 0	$ 0
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	0
Defined Benefit Plan, Service Cost	9	9	9
Defined Benefit Plan, Interest Cost	24	29	31
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(41)	(40)	(41)
Defined Benefit Plan Net Amortization	(13)	(14)	(12)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(21)	(16)	(13)
Other Postretirement Benefits Plan [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	0	0	0
Defined Benefit Plan, Service Cost	2	2	2
Defined Benefit Plan, Interest Cost	11	14	15
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(21)	(21)	(21)
Defined Benefit Plan Net Amortization	(6)	(6)	(5)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(14)	(11)	(9)
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	(21)	0	0
Defined Benefit Plan, Plan Assets, Payment for Settlement	119	15
Defined Benefit Plan, Service Cost	21	24	29
Defined Benefit Plan, Interest Cost	105	116	126
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(164)	(160)	(160)
Defined Benefit Plan Net Amortization	28	25	46
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	11	5	41
Domestic Plan [Member] | Pension Plan [Member] | PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	22	0	0
Defined Benefit Plan, Plan Assets, Payment for Settlement	52
Defined Benefit Plan, Service Cost	0	0	4
Defined Benefit Plan, Interest Cost	43	49	54
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(72)	(72)	(75)
Defined Benefit Plan Net Amortization	13	14	34
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 6	$ (9)	$ 17