Employee Benefit Plans Employee Benefit Plans - Asset Allocations (Details)	12 Months Ended
	Dec. 31, 2013
Pension [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	53.00%	[1],[2]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	57.00%	[1],[2]
Pension [Member] | Debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	33.00%	[1],[2]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	37.00%	[1],[2]
Pension [Member] | Limited partnership interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	8.00%	[1]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	12.00%	[1]
Pension [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	0.00%	[1]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	1.00%	[1]
Other Postretirement [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	61.00%	[1],[2]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	65.00%	[1],[2]
Other Postretirement [Member] | Debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	33.00%	[1],[2]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	37.00%	[1],[2]
Other Postretirement [Member] | Limited partnership interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	1.00%	[1]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	3.00%	[1]
Other Postretirement [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	0.00%	[1]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	1.00%	[1]

[1] 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.

[2] 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.