Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Dec. 31, 2011
Asset Retirement Obligation [Rollforward]
Balance at Beginning of Period	$ 497
Accretion expense	9
Changes in estimated cash flow or settlement date	2
Obligations settled	(4)
Balance at End of Period	504
Susquehanna Nuclear Station ARO (Numeric) [Abstract]
Susquehanna accrued nuclear decommissioning obligation	298	292
Susquehanna NDT funds	$ 693	$ 640

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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

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-Name Statement of Financial Accounting Standard (FAS)

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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

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- Definition

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

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-Publisher FASB

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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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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

Amount of a decommissioning liability associated with a legal obligation that a firm incurs when it constructs or operates an asset that must eventually be withdrawn from active service. This may include operating assets such as nuclear power plants or shipping vessels.

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