Employee Benefit Plans (MEC) (Tables) (MidAmerican Energy Company [Member])

3 Months Ended

Mar. 31, 2013

MidAmerican Energy Company [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

Net periodic benefit cost for the plans of MidAmerican Energy and the aforementioned affiliates included the following components (in millions):

	Three-Month Periods
	Ended March 31,
	2013			2012
Pension:
Service cost	$	5		$	4
Interest cost	8			9
Expected return on plan assets	(11		)	(10		)
Net amortization	3			1
Net periodic benefit cost	$	5		$	4
Other postretirement:
Service cost	$	1		$	1
Interest cost	2			2
Expected return on plan assets	(3		)	(3		)
Net amortization	(1		)	—
Net periodic benefit cost (benefit)	$	(1	)	$	—