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Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Changes to the asset retirement obligations
Beginning Balance	$ 1,599
Liabilities settled	(10)
Accretion	55
Revisions in estimated cash flows	151
Ending Balance	1,795
FES
Changes to the asset retirement obligations
Beginning Balance	965
Liabilities settled	(11)
Accretion	33
Revisions in estimated cash flows	151
Ending Balance	$ 1,138

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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