Recent Financing Transactions Recent Financings - Credit Facilities (Details) (PacifiCorp [Member], USD $) In Millions, unless otherwise specified	1 Months Ended
	Mar. 31, 2014
Letters of credit supporting tax-exempt bond obligations [Member]
Line of Credit Facility [Line Items]
Letters of credit outstanding, amount	$ 451
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility, amounts supported	270
Letter of Credit [Member] | Letters of credit supporting tax-exempt bond obligations [Member]
Line of Credit Facility [Line Items]
Credit facility, amount canceled	97
Unenhanced Variable-Rate Tax-Exempt Bond Obligations [Member]
Line of Credit Facility [Line Items]
Line of credit facility, amounts supported	$ 142