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

9 Months Ended

Sep. 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						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2013			2012			2013			2012
Pension:
Service cost	$	4		$	4		$	13		$	13
Interest cost	9			9			25			27
Expected return on plan assets	(12		)	(11		)	(34		)	(33		)
Net amortization	3			1			8			3
Net periodic benefit cost	$	4		$	3		$	12		$	10
Other postretirement:
Service cost	$	2		$	1		$	4		$	3
Interest cost	2			2			6			6
Expected return on plan assets	(3		)	(4		)	(10		)	(10		)
Net amortization	(1		)	—			(2		)	(2		)
Net periodic benefit cost (benefit)	$	—		$	(1	)	$	(2	)	$	(3	)