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Summary of Significant Accounting Policies (Asset Retirement Obligation) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended	3 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 San Onofre (nuclear)	Sep. 30, 2013 San Onofre (nuclear)
Significant Accounting Policies [Line Items]
Increase in ARO liability			$ 455
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	2,782	2,610		2,710
Accretion expense	134	161
Revisions	455	12
Liabilities settled	0	(1)
Ending balance	$ 3,371	$ 2,782		$ 2,710

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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