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Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Asset Retirement Obligations [Line Items]
Asset Retirement Obligation, Legally Restricted Assets, Fair Value	$ 2,201		$ 2,201	$ 2,204
Changes to the asset retirement obligations
Beginning Balance			1,599	1,497
Liabilities settled			(18)	(2)
Accretion			115	104
Revisions in estimated cash flows			(18)
Ending Balance	1,678		1,678	1,599
FES
Asset Retirement Obligations [Line Items]
Asset Retirement Obligation, Legally Restricted Assets, Fair Value	1,276		1,276	1,283
Changes to the asset retirement obligations
Beginning Balance			965	904
Liabilities settled			(18)	(1)
Accretion			71	62
Revisions in estimated cash flows	(171)	5	(3)
Ending Balance	1,015		1,015	965
FES \| LBR
Changes to the asset retirement obligations
Revisions in estimated cash flows			163
OE
Changes to the asset retirement obligations
Revisions in estimated cash flows	(15)
TE
Changes to the asset retirement obligations
Revisions in estimated cash flows	$ (7)	$ 7

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.

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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.

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