Employee Benefit Plans Employee Benefit Plans - Multiemployer Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2014		Dec. 31, 2013		Jun. 30, 2013		Dec. 31, 2012		Jun. 30, 2012		Dec. 31, 2011
Multiemployer Plans [Line Items]
Joint Trustee Plan, Percentage By Which Joint Trustee Plan was at Least Funded	80.00%	[1]			80.00%	[1]			80.00%	[1]
Joint Trustee Plan, Period Contributions			$ 9	[2]			$ 12	[2]			$ 12	[2]
UMWA Pension Plan [Member]
Multiemployer Plans [Line Items]
Multiemployer Plans, Certified Zone Status	Orange	[1],[3]			Orange	[1]			Orange	[1]
Multiemployer Plan, Period Contributions			3	[2]			3	[2]			3	[2]
Estimated liability if subsidiary were to withdraw from multiemployer plan			$ 125

[1] Among other factors, multiemployer plans in seriously endangered status are at least 65% but less than 80% funded and have an accumulated funding deficiency for such plan year, or are projected to have such an accumulated funding deficiency for any of the six succeeding plan years.

[2] PacifiCorp's and its subsidiary's minimum contributions to the plans are based on the amount of wages paid to employees covered by the Local 57 Trust Fund collective bargaining agreements and the number of mining hours worked for the UMWA Pension Plan, respectively, subject to ERISA minimum funding requirements.

[3] If PacifiCorp's subsidiary was to withdraw from the UMWA Pension Plan, a liability of up to an estimated $125 million could be triggered.