Consolidated Statements Of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Comprehensive Income (Loss), tax	$ 0	$ (2)	$ (6)
Common Stock, Dividends, Per Share, Cash Paid	$ 1.96	$ 1.88	$ 1.80
Net Current Period Other Comprehensive Income (Loss)	$ (15)	$ (31)	$ 28
Comprehensive Income	1,890	1,662	1,466
Member's Equity	15,984	15,089	14,377	$ 13,847
Cumulative Effect, Period of Adoption, Adjustment
Member's Equity		(2)
Retained Earnings [Member]
Member's Equity	12,318	11,406	10,582	9,878
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment
Member's Equity		(2)	81	176
Accumulated Other Comprehensive Income (Loss) [Member]
Net Current Period Other Comprehensive Income (Loss)	(15)	(31)	28
Member's Equity	(504)	(489)	(377)	(229)
Accumulated Other Comprehensive Income (Loss) [Member] | Cumulative Effect, Period of Adoption, Adjustment
Member's Equity			(81)	(176)
Public Service Electric and Gas Company
Other Comprehensive Income (Loss), tax	0	(1)	1
Net Current Period Other Comprehensive Income (Loss)	1	3	(1)
Comprehensive Income	1,328	1,253	1,066
Member's Equity	13,129	11,903	10,900	9,834
Public Service Electric and Gas Company | Cumulative Effect, Period of Adoption, Adjustment
Member's Equity		(2)
Public Service Electric and Gas Company | Retained Earnings [Member]
Member's Equity	10,078	8,928	7,928	6,861
Public Service Electric and Gas Company | Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment
Member's Equity		(2)
Public Service Electric and Gas Company | Accumulated Other Comprehensive Income (Loss) [Member]
Net Current Period Other Comprehensive Income (Loss)	1	3	(1)
Member's Equity	3	2	(1)	0
PSEG Power LLC
Other Comprehensive Income (Loss), tax	1	(9)	(7)
Net Current Period Other Comprehensive Income (Loss)	(18)	(13)	28
Comprehensive Income	576	455	393
Member's Equity	6,212	5,890	5,960	5,967
PSEG Power LLC | Retained Earnings [Member]
Member's Equity	5,307	5,063	5,051	4,911
PSEG Power LLC | Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment
Member's Equity			69	175
PSEG Power LLC | Accumulated Other Comprehensive Income (Loss) [Member]
Net Current Period Other Comprehensive Income (Loss)	(18)	(13)	28
Member's Equity	$ (419)	$ (401)	(319)	(172)
PSEG Power LLC | Accumulated Other Comprehensive Income (Loss) [Member] | Cumulative Effect, Period of Adoption, Adjustment
Member's Equity			$ (69)	$ (175)