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- Definition

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

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(3)

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

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- Definition

Carrying amount of an asset that is legally restricted for purposes of settling an asset retirement obligation.

+ References

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- Definition

Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

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- Definition

Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

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- Definition

The increase (decrease) during the reporting period in the value of assets that are created when regulatory agencies permits public utilities to defer costs (revenues) to the balance sheet. This element is a the increase (decrease) of regulatory assets and liabilities combined.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013
Asset Retirement Obligations [Line Items]
Fair value of decommissioning trust assets	$ 2,341	$ 2,201		$ 2,341	$ 2,201
Changes to the asset retirement obligations
Beginning Balance				1,678us-gaap_AssetRetirementObligation	1,599us-gaap_AssetRetirementObligation
Liabilities settled				(9)	(18)
Accretion				113	115
Revisions in estimated cash flows	(395)	(193)	12	(395)	(18)
Ending Balance	1,387us-gaap_AssetRetirementObligation	1,678us-gaap_AssetRetirementObligation		1,387us-gaap_AssetRetirementObligation	1,678us-gaap_AssetRetirementObligation
Decrease in ARO				(443)
FES
Asset Retirement Obligations [Line Items]
Fair value of decommissioning trust assets	1,365	1,276		1,365	1,276
Changes to the asset retirement obligations
Beginning Balance				1,015	965
Liabilities settled				(7)	(18)
Accretion				66	71
Revisions in estimated cash flows	(233)	(171)	5	(233)	(3)
Ending Balance	841	1,015		841	1,015
FES \| LBR
Changes to the asset retirement obligations
Revisions in estimated cash flows				163
Asset Retirement Obligation Costs [Member] \| TMI-2
Changes to the asset retirement obligations
Decrease in ARO	$ (133)