Employee Benefit Plans (MEC) Plan Assumptions (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumptions Used Calculating Benefit Obligation, Discount Rate	4.75%		4.00%		4.75%
Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	3.00%		3.00%		3.50%
Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.00%		4.75%		5.50%
Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	7.50%	[1]	7.50%	[1]	7.50%	[1]
Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.00%		3.50%		3.50%
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumptions Used Calculating Benefit Obligation, Discount Rate	4.50%		3.75%		4.75%
Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.75%		4.75%		5.50%
Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	7.25%	[1]	7.50%	[1]	7.50%	[1]
Health Care Cost Trend Rate Assumed for Next Fiscal Year	8.00%		8.00%
Ultimate Health Care Cost Trend Rate	5.00%		5.00%
Year that Rate Reaches Ultimate Trend Rate	2019		2018
Effect of One Percentage Point Increase on Service and Interest Cost Components	$ 0
Effect of One Percentage Point Decrease on Service and Interest Cost Components	0
Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation	5
Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation	$ (4)
United States Non-Union Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	5.56%		5.75%		5.75%

[1] (1)Amounts reflected are pre-tax values. Assumed after-tax returns for a taxable, non-union other postretirement plan were 5.56% for 2013, and 5.75% for 2012 and 2011.