Changes In Capitalization (Detail) (USD $) In Millions, unless otherwise specified			9 Months Ended						9 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Power [Member]	Sep. 30, 2013 Power [Member] Senior Notes Two Point Five Zero Percentage Due Two Thousand Thirteen [Member]	Sep. 30, 2013 PSE And G [Member]	Sep. 30, 2012 PSE And G [Member]	Sep. 30, 2013 PSE And G [Member] Two Point Three Percent Secured MTN [Member]	Sep. 30, 2013 PSE And G [Member] Three Point Seven Five Percent Secured Medium Term Notes [Member]	Sep. 30, 2013 PSE And G [Member] Five Point Three Seven Five Percent Secured Medium Term Notes [Member]	Sep. 30, 2013 PSE And G [Member] Two Point Three Seven Five Percent Secured Medium Term Notes [Member]	Sep. 30, 2013 PSE And G [Member] Five Point Zero Secured MTN [Member]	Sep. 30, 2013 PSE And G [Member] Three Point Eight Secured MTN [Member]	Sep. 30, 2013 PSE And G [Member] Transition Fundings Securitization Debt [Member]	Sep. 30, 2013 PSE And G [Member] Transition Fundings Ii Securitization Debt [Member]
Long-term debt	$ 8,486	$ 7,939
Stated interest rate of debt instrument				2.50%			2.30%	3.75%	5.375%	2.375%	5.00%	3.80%
Contributed Capital					100	0
Cash dividend paid			690
Repayments of Long-term Debt				300					300		150
Transition Funding's securitization debt													156
Issuance of senior debt							350	250		500		400
Payments For Transition Fundings I I Securitization Debt														$ 6