Gross appreciation or the gross loss in value of the total unsold securities, after tax, attributable to the parent entity.

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+ Details

Available-For-Sale Securities (Narrative) (Details) (USD $) In Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains		$ 26	$ 26	$ 121	$ 86
Nuclear Decommissioning Trust (NDT) Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amount of other-than-temporary impairments				10
Nuclear Decommissioning Trust (NDT) Funds [Member] \| Power [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
After tax amount of net unrealized gains recognized in AOCI				32
Rabbi Trusts [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains	31	0	31	0	31
Amount of other-than-temporary impairments				$ 3