Related-Party Transactions (Schedule Of Related Party Transactions, Revenue) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Power [Member]
Billings to PSE&G through BGS and BGSS	$ 696	[1]	$ 731	[1]
Administrative Billings from Services	45	[2]	42	[2]
PSE And G [Member]
Billings from Power through BGS and BGSS	696	[1]	731	[1]
Administrative Billings from Services	66	[2]	60	[2]
Total Billings from Affiliates	$ 762		$ 791

[1] PSE&G has entered into a requirements contract with Power under which Power provides the gas supply services needed to meet PSE&G’s BGSS and other contractual requirements. Power has also entered into contracts to supply energy, capacity and ancillary services to PSE&G through the BGS auction process.

[2] Services provides and bills administrative services to PSE&G and Power at cost. In addition, PSE&G and Power have other payables to Services, including amounts related to certain common costs, such as pension and OPEB costs, which Services pays on behalf of each of the operating companies.