Employee Benefit Plans - PacifiCorp - Asset Allocations (Details) - PacifiCorp [Member]	12 Months Ended
	Dec. 31, 2016	[2]
Domestic Pension Plans [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	33.00%	[1]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	37.00%	[1]
Domestic Pension Plans [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	53.00%	[1]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	57.00%	[1]
Domestic Pension Plans [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	8.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	12.00%
Domestic Pension Plans [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	0.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	1.00%
Domestic Other Postretirement Plans [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	33.00%	[1]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	37.00%	[1]
Domestic Other Postretirement Plans [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	61.00%	[1]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	65.00%	[1]
Domestic Other Postretirement Plans [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	1.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	3.00%
Domestic Other Postretirement Plans [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	0.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	1.00%

[1] For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.

[2] PacifiCorp's Retirement Plan trust includes a separate account that is used to fund benefits for the other postretirement benefit plan. In addition to this separate account, the assets for the other postretirement benefit plan are held in Voluntary Employees' Beneficiary Association ("VEBA") trusts, each of which has its own investment allocation strategies. Target allocations for the other postretirement benefit plan include the separate account of the Retirement Plan trust and the VEBA trusts.