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

3 Months Ended

Mar. 31, 2015

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,
	2015			2014
Pension:
Service cost	$	3		$	3
Interest cost	8			9
Expected return on plan assets	(11		)	(11		)
Net amortization	—			1
Net periodic benefit cost	$	—		$	2
Other postretirement:
Service cost	$	2		$	1
Interest cost	2			2
Expected return on plan assets	(4		)	(3		)
Net amortization	(1		)	(1		)
Net periodic benefit cost (benefit)	$	(1	)	$	(1	)