Related-Party Transactions (Schedule Of Related Party Transactions, Revenue) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020		Mar. 31, 2019
Public Service Electric and Gas Company [Member]
Related Party Transaction [Line Items]
Net Billings from Power primarily through BGS and BGSS		$ 490	[1]	$ 633
Administrative Billings from Services	[2]	78		75
Total Billings from Affiliates		568		708
PSEG Power [Member]
Related Party Transaction [Line Items]
Net Billings to PSE&G primarily through BGS and BGSS	[1]	490		633
Administrative Billings from Services	[2]	$ 45		$ 45

[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.