Changes In Capitalization (Detail) (USD $) In Millions, unless otherwise specified			6 Months Ended					6 Months Ended		6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Power [Member]	Jun. 30, 2013 Power [Member] Senior Notes Two Point Five Zero Percentage Due Two Thousand Thirteen [Member]	Jun. 30, 2013 PSE And G [Member]	Jun. 30, 2012 PSE And G [Member]	Jun. 30, 2013 PSE And G [Member] Three Point Nine Five Percent Secured Medium Term Notes [Member]	Jun. 30, 2013 PSE And G [Member] Five Point Zero Secured MTN [Member]	Jun. 30, 2013 PSE And G [Member] Three Point Eight Secured MTN [Member]	Jun. 30, 2013 PSE And G [Member] Transition Fundings Securitization Debt [Member]	Jun. 30, 2013 PSE And G [Member] Transition Fundings Ii Securitization Debt [Member]
Long-term debt	$ 8,250	$ 7,939
Stated interest rate of debt instrument				2.50%			2.375%	5.00%	3.80%
Contributed Capital					100	0
Cash dividend paid			500
Repayments of Long-term Debt				300				150
Transition Funding's securitization debt										100
Issuance of senior debt							500		400
Payments For Transition Fundings I I Securitization Debt											$ 6