Related-Party Transactions (Schedule Of Related Party Transactions, Revenue) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
PSEG Power LLC
Related Party Transaction [Line Items]
Billings To PSE&G through BGSS and BGS	[1]	$ 1,512	$ 1,514	$ 1,580
Administrative Billings from Services	[2]	156	145	168
Public Service Electric and Gas Company
Related Party Transaction [Line Items]
Billings from Power through BGSS and BGS	[1]	1,512	1,514	1,580
Administrative Billings from Services	[2]	310	333	331
Total Expense Billings from Affiliates		$ 1,822	$ 1,847	$ 1,911

[1] PSE&G has entered into a requirements contract with PSEG Power under which PSEG Power provides the gas supply services needed to meet PSE&G’s BGSS and other contractual requirements. PSEG Power has also entered into contracts to supply energy, capacity and ancillary services to PSE&G through the BGS auction process and sells ZECs to PSE&G under the ZEC program. The rates in the BGS and BGSS contracts and for the ZEC sales are prescribed by the BPU. BGS and BGSS sales are billed and settled on a monthly basis. ZEC sales are billed on a monthly basis and settled annually following completion of each energy year. In addition, PSEG 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 PSEG Power at cost. In addition, PSE&G and PSEG Power have other payables to Services, including amounts related to certain common costs, which Services pays on behalf of each of the operating companies.