Related-Party Transactions (Schedule Of Related Party Transactions, Revenue) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
PSE&G [Member]
Related Party Transaction [Line Items]
Billings from Power through BGSS and BGS	[1]	$ 1,630	$ 1,771	$ 1,797
Administrative Billings from Services	[2]	274	248	255
Total Expense Billings from Affiliates		1,904	2,019	2,052
Power [Member]
Related Party Transaction [Line Items]
Administrative Billings from Services	[2]	$ 187	$ 165	$ 178

[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.