Changes In Capitalization (Detail) (USD $) In Millions, unless otherwise specified			9 Months Ended			9 Months Ended		9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 5.20% Fixed Rate Pollution Control [Member]	Sep. 30, 2012 Power [Member]	Sep. 30, 2012 Power [Member] Pollution Control Revenue Bond, 5.00% [Member[	Sep. 30, 2012 PSE And G [Member] Five Point One Three Secured MTN [Member]	Sep. 30, 2012 PSE And G [Member] Three Point Six Five Percent Secured MTN [Member]	Sep. 30, 2012 PSE And G [Member] 5.45% Fixed Rate Pollution Control [Member]	Sep. 30, 2012 PSE And G [Member] Weekly Reset Variable Rate Demand Bonds [Member]	Sep. 30, 2012 PSE And G [Member] 3.95% Secured Medium Term Notes [Member]	Sep. 30, 2012 Energy Holdings [Member]
Long-term debt	$ 8,309	$ 8,094			$ 66
Stated interest rate of debt instrument			5.20%		5.00%	5.125%	3.65%	5.45%		3.95%
Cash dividend paid				600
Repayments of Long-term Debt						300
Transition Funding's securitization debt								5
Transition Funding II's securitization debt								149
Issuance of senior debt							350			450
Debt instrument maturity period										May 01, 2042
Refinancing of debt instrument at par value								50	50
Redemption of debt instrument			23
Debt instrument maturity date			Mar. 01, 2025					Feb. 01, 2032
Nonrecourse project debt											$ 50