Regulatory Matters Regulatory Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Regulatory Assets [Line Items]
Current regulatory assets	$ 94		$ 62
Noncurrent regulatory assets	1,290		1,773
Total regulatory assets	1,384		1,835
Regulatory assets not earning a return on investment	1,244		1,618
Deferred income taxes [Member]
Regulatory Assets [Line Items]
Weighted Average Remaining Life	33 years	[1]
Total regulatory assets	461	[1]	456	[1]
Employee benefit plans [Member]
Regulatory Assets [Line Items]
Weighted Average Remaining Life	9 years	[2]
Total regulatory assets	390	[2]	776	[2]
Unamortized contract values [Member]
Regulatory Assets [Line Items]
Weighted Average Remaining Life	8 years
Total regulatory assets	146		166
Deferred net power costs [Member]
Regulatory Assets [Line Items]
Weighted Average Remaining Life	2 years
Total regulatory assets	139		135
Unrealized loss on derivative contracts [Member]
Regulatory Assets [Line Items]
Weighted Average Remaining Life	4 years
Total regulatory assets	55		121
Other [Member]
Regulatory Assets [Line Items]
Weighted Average Remaining Life	Various
Total regulatory assets	$ 193		$ 181

[1] Amounts primarily represent income tax benefits and expense related to certain property-related basis differences and other various items that PacifiCorp is required to pass on to its customers.

[2] Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in rates when recognized.