Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Available-for-Sale Securities, tax	$ 38	$ (8)
Change in Fair Value of Derivative Instruments, tax	14	6
Reclassification Adjustments for Net Amounts included in Net Income, tax	(15)	(28)
Pension/OPEB adjustment, tax	5	4
Power [Member]
Available-for-Sale Securities, tax	39	(9)
Change in Fair Value of Derivative Instruments, tax	14	6
Reclassification Adjustments for Net Amounts included in Net Income, tax	(15)	(28)
Pension/OPEB adjustment, tax	5	4
PSE And G [Member]
Available-for-Sale Securities, tax	$ (1)	$ 1

Tax effect of the gross appreciation or the gross loss, net of reclassification adjustment, in the value of the total unsold available-for-sale securities at the end of an accounting period.

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Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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- Definition

Tax effect on reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period.

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- Definition

Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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