Employee Benefit Plans (MEC) Asset Allocations (Details) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percentage of plan assets) - minimum	20.00%	[1]
Target allocations (percentage of plan assets) - maximum	40.00%	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percentage of plan assets) - minimum	60.00%	[1]
Target allocations (percentage of plan assets) - maximum	80.00%	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percentage of plan assets) - minimum	2.00%
Target allocations (percentage of plan assets) - maximum	8.00%
United States Pension Plans of US Entity, Defined Benefit [Member] | Other securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percentage of plan assets) - minimum	0.00%
Target allocations (percentage of plan assets) - maximum	5.00%
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percentage of plan assets) - minimum	25.00%	[1]
Target allocations (percentage of plan assets) - maximum	45.00%	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percentage of plan assets) - minimum	50.00%	[1]
Target allocations (percentage of plan assets) - maximum	80.00%	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percentage of plan assets) - minimum	0.00%
Target allocations (percentage of plan assets) - maximum	0.00%
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Other securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percentage of plan assets) - minimum	0.00%
Target allocations (percentage of plan assets) - maximum	5.00%

[1] For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.