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

6 Months Ended

Jun. 30, 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						Six-Month Periods
	Ended June 30,						Ended June 30,
	2013			2012			2013			2012
Pension:
Service cost	$	4		$	5		$	9		$	9
Interest cost	8			9			16			18
Expected return on plan assets	(11		)	(12		)	(22		)	(22		)
Net amortization	2			1			5			2
Net periodic benefit cost	$	3		$	3		$	8		$	7
Other postretirement:
Service cost	$	1		$	1		$	2		$	2
Interest cost	2			2			4			4
Expected return on plan assets	(4		)	(3		)	(7		)	(6		)
Net amortization	—			(2		)	(1		)	(2		)
Net periodic benefit cost (benefit)	$	(1	)	$	(2	)	$	(2	)	$	(2	)