Related-Party Transactions (Schedule Of Related Party Transactions, Revenue) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
PSE And G [Member]
Related Party Transaction [Line Items]
Net Billings from Power primarily through BGS and BGSS	[1]	$ 578	$ 599
Administrative Billings from Services	[2]	83	65
Total Billings from Affiliates		661	664
Power [Member]
Related Party Transaction [Line Items]
Net Billings to PSE&G primarily through BGS and BGSS	[1]	578	599
Administrative Billings from Services	[2]	$ 43	$ 36

[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.