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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Asset Retirement Obligation

-URI http://asc.fasb.org/extlink&oid=6505190

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- Definition

The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

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- Definition

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 405

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394

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Asset Retirement Obligations (MEC) By Type (Details) (MidAmerican Energy Company [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Asset Retirement Obligations By Type [Line Items]
Total asset retirement obligations	$ 430	$ 318	$ 293
Quad Cities Station nuclear decommissioning trust funds	394	337
Quad Cities Unit Nos. 1 & 2 [Member]
Asset Retirement Obligations By Type [Line Items]
Quad Cities Station nuclear decommissioning trust funds	394	337
Quad Cities Unit Nos. 1 & 2 [Member]
Asset Retirement Obligations By Type [Line Items]
Total asset retirement obligations	254	243
Fossil-fueled generating facilities [Member]
Asset Retirement Obligations By Type [Line Items]
Total asset retirement obligations	127	24
Wind-powered generating facilities [Member]
Asset Retirement Obligations By Type [Line Items]
Total asset retirement obligations	45	48
Other [Member]
Asset Retirement Obligations By Type [Line Items]
Total asset retirement obligations	4	3
Cost of removal accrual [Member]
Asset Retirement Obligations By Type [Line Items]
Regulatory Liabilities	$ 649	$ 629