Related-Party Transactions (Schedule Of Related Party Transactions, Revenue) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
PSE&G [Member]
Related Party Transaction [Line Items]
Billings from Power through BGSS and BGS	[1]	$ 1,514	$ 1,580	$ 1,587
Administrative Billings from Services	[2]	333	331	312
Total Expense Billings from Affiliates		1,847	1,911	1,899
Power [Member]
Related Party Transaction [Line Items]
Administrative Billings from Services	[2]	$ 145	$ 168	$ 179

[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. The rates in the BGS and BGSS contracts are prescribed by the BPU. In addition, Power and PSE&G provide certain technical services for each other generally at cost in compliance with FERC and BPU affiliate rules.

[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.