Changes In Capitalization (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Power [Member]
Cash Dividends Paid to Parent Company	$ 575
Contributed Capital	0	24
PSE And G [Member]
Contributed Capital	175	100
Medium Term Notes One Point Eight Percent Due In Two Thousand Nineteen [Member] [Domain] | PSE And G [Member]
Stated interest rate of debt instrument	1.80%
Proceeds from Issuance of Long-term Debt	250
Medium Term Notes Two Point Three Zero Percent Due In Two Thousand Eighteen [Member] [Member] | PSE And G [Member]
Stated interest rate of debt instrument	4.00%
Proceeds from Issuance of Long-term Debt	250
Securitization Debt [Member] | PSE And G [Member]
Repayments of Long-term Debt	105
Transition Fundings Ii Securitization Debt [Member] | PSE And G [Member]
Repayments of Long-term Debt	$ 6