Changes In Capitalization (Detail) (USD $) In Millions, unless otherwise specified			9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Power [Member]	Sep. 30, 2013 Power [Member]	Sep. 30, 2014 PSE And G [Member]	Sep. 30, 2013 PSE And G [Member]	Sep. 30, 2014 Medium Term Notes Five Point Zero Zero Percentage Due On Two Thousand Fourteen [Member] PSE And G [Member]	Sep. 30, 2014 Medium Term Notes Zero Point Eight Five Percentage Due On Two Thousand Fourteen [Member] PSE And G [Member]	Sep. 30, 2014 Medium Term Notes One Point Eight Percent Due In Two Thousand Nineteen [Member] [Domain] PSE And G [Member]	Sep. 30, 2014 Medium Term Notes Two Point Three Zero Percent Due In Two Thousand Eighteen [Member] [Member] PSE And G [Member]	Sep. 30, 2014 Medium Term Notes Two Point Zero Percent Due In Two Thousand Nineteen [Member] PSE And G [Member]	Sep. 30, 2014 Medium Term Notes Three Point One Five Percent Due In Two Thousand Twenty Four [Member] PSE And G [Member]	Sep. 30, 2014 Securitization Debt [Member] PSE And G [Member]	Sep. 30, 2014 Transition Fundings Ii Securitization Debt [Member] PSE And G [Member]	Sep. 30, 2014 PEDFA Variable Rate Bonds backed by letter of credit [Member] Power [Member]
Cash Dividends Paid to Parent Company			$ 775
Stated interest rate of debt instrument							5.00%	0.85%	1.80%	4.00%	2.00%	3.15%
Proceeds from Issuance of Long-term Debt									250	250	250	250
Repayments of Long-term Debt							250	250					164	6
Contributed Capital			0	24	175	100
Long-term Debt	$ 8,963	$ 8,643													$ 44