Employee Benefit Plans (MEC) Narrative (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2014
United States Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated employer contributions in current fiscal year	$ 8
Employer contributions in current year	4
United States Defined Benefit Other Postretirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated employer contributions in current fiscal year	1
Employer contributions in current year	$ 0

Amount of the employer's best estimate of contributions expected to be paid to the plan in the current fiscal period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2709-114920

Name:	us-gaap_DefinedBenefitPlanExpectedContributionsInCurrentFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration