Employee Benefit Plans - PacifiCorp - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 29	$ 33	$ 36
Defined Benefit Plan, Interest Cost	126	121	131
Defined Benefit Plan, Expected Return on Plan Assets	(160)	(169)	(164)
Defined Benefit Plan Net Amortization	46	53	44
Defined Benefit Plan, Net Periodic Benefit Cost	41	38	47
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	9	11	14
Defined Benefit Plan, Interest Cost	31	31	46
Defined Benefit Plan, Expected Return on Plan Assets	(41)	(45)	(53)
Defined Benefit Plan Net Amortization	(12)	(11)	(3)
Defined Benefit Plan, Net Periodic Benefit Cost	(13)	(14)	4
PacifiCorp [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	4	4	5
Defined Benefit Plan, Interest Cost	54	53	57
Defined Benefit Plan, Expected Return on Plan Assets	(75)	(77)	(76)
Defined Benefit Plan Net Amortization	34	42	29
Defined Benefit Plan, Net Periodic Benefit Cost	17	22	15
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	2	3	6
Defined Benefit Plan, Interest Cost	15	16	28
Defined Benefit Plan, Expected Return on Plan Assets	(21)	(23)	(31)
Defined Benefit Plan Net Amortization	(5)	(4)	2
Defined Benefit Plan, Net Periodic Benefit Cost	$ (9)	$ (8)	$ 5