Available-For-Sale Securities (Fair Value Of Rabbi Trust) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Total Available-for-Sale Securities	$ 226	$ 172
Power [Member]
Total Available-for-Sale Securities	44	33
PSE And G [Member]
Total Available-for-Sale Securities	75	57
Other
Total Available-for-Sale Securities	$ 107	$ 82

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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+ Details