Changes In Capitalization (Detail) (USD $) In Millions, unless otherwise specified			3 Months Ended					3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Power [Member]	Mar. 31, 2013 PSE And G [Member]	Mar. 31, 2012 PSE And G [Member]	Mar. 31, 2013 PSE And G [Member] Five Point Zero Secured MTN [Member]	Mar. 31, 2013 PSE And G [Member] Three Point Eight Secured MTN [Member]	Mar. 31, 2013 PSE And G [Member] Transition Fundings Securitization Debt [Member]	Mar. 31, 2013 Energy Holdings [Member]
Long-term debt	$ 8,114	$ 7,939
Stated interest rate of debt instrument						5.00%	3.80%
Contributed Capital				100	0
Cash dividend paid			250
Repayments of Long-term Debt						150
Transition Funding's securitization debt								51
Issuance of senior debt							400
Non-Recourse Debt									$ 18