Regulatory Matters (MEC) Assets (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Regulatory Assets [Line Items]
Regulatory assets	$ 748		$ 876
Regulatory assets not earning a return on investment	743		871
Deferred income taxes, net [Member]
Regulatory Assets [Line Items]
Regulatory assets	649	[1]	640	[1]
Average Remaining Life	24 years
Asset retirement obligations [Member]
Regulatory Assets [Line Items]
Regulatory assets	34	[2]	24	[2]
Average Remaining Life	19 years
Employee benefit plans [Member]
Regulatory Assets [Line Items]
Regulatory assets	26	[3]	121	[3]
Average Remaining Life	10 years
Unrealized loss on regulated derivative contracts [Member]
Regulatory Assets [Line Items]
Regulatory assets	10		50
Average Remaining Life	1 year
Other [Member]
Regulatory Assets [Line Items]
Regulatory assets	$ 29		$ 41
Regulatory asset amortization period years	Various

[1] Amounts primarily represent income tax benefits related to state accelerated tax depreciation and certain property-related basis differences that were previously flowed through to customers and will be included in regulated rates when the temporary differences reverse.

[2] (2)Amount predominantly relates to asset retirement obligations for fossil-fueled and wind-powered generating facilities. Refer to Note 12 for a discussion of asset retirement obligations.

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