Selected Quarterly Data (Schedule Of Selected Quarterly Data) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended												12 Months Ended
	Dec. 31, 2019		Sep. 30, 2019	Jun. 30, 2019		Mar. 31, 2019	Dec. 31, 2018		Sep. 30, 2018	Jun. 30, 2018		Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Quarterly Data [Line Items]
Operating Revenues	$ 2,478		$ 2,302	$ 2,316		$ 2,980	$ 2,468		$ 2,394	$ 2,016		$ 2,818	$ 10,076	$ 9,696	$ 9,094
Operating Income (Loss)	507		490	160	[1]	786	501		554	411	[1]	832	1,943	2,298	1,429
Net Income (Loss)	$ 437	[2]	$ 403	$ 153	[1]	$ 700	$ 199	[2]	$ 412	$ 269	[1]	$ 558
Net Income (Loss)													$ 1,693	$ 1,438	$ 1,574
Basic	504		504	504		504	504		504	504		504	504	504	505
Diluted	507		507	507		507	508		507	507		507	507	507	507
Earnings Per Share, Basic	$ 0.86	[2]	$ 0.80	$ 0.30	[1]	$ 1.39	$ 0.39	[2]	$ 0.82	$ 0.53	[1]	$ 1.11	$ 3.35	$ 2.85	$ 3.12
Earnings Per Share, Diluted	$ 0.86	[2]	$ 0.79	$ 0.30	[1]	$ 1.38	$ 0.39	[2]	$ 0.81	$ 0.53	[1]	$ 1.10	$ 3.33	$ 2.83	$ 3.10
Public Service Electric and Gas Company
Schedule of Quarterly Data [Line Items]
Operating Revenues	$ 1,607		$ 1,604	$ 1,382		$ 2,032	$ 1,645		$ 1,595	$ 1,386		$ 1,845	$ 6,625	$ 6,471	$ 6,324
Operating Income (Loss)	330		392	282		465	345		421	358		482	1,469	1,606	1,760
Net Income (Loss)	276		344	227		403	239		278	231		319
Net Income (Loss)													1,250	1,067	973
PSEG Power LLC
Schedule of Quarterly Data [Line Items]
Operating Revenues	1,115		771	1,083		1,416	1,108		868	767		1,403	4,385	4,146	3,860
Operating Income (Loss)	154		79	(86)	[1]	301	113		112	42	[1]	329	448	596	(367)
Net Income (Loss)	$ 159	[2]	$ 53	$ (40)	[1]	$ 296	$ (35)	[2]	$ 125	$ 41	[1]	$ 234
Net Income (Loss)													$ 468	$ 365	$ 479

[1] The decrease in Operating Income and Net Income at PSEG consolidated and PSEG Power in the second quarter of 2019 as compared to the same quarter in 2018 was primarily due to the loss in 2019 related to the sale of PSEG Power’s ownership interests in the Keystone and Conemaugh fossil generation plants, offsetting MTM net gains in 2019 as compared to net losses in 2018.

[2] The increase in Net Income at PSEG consolidated and PSEG Power in the fourth quarter of 2019 as compared to the same quarter in 2018 was primarily due to net gains in 2019 as compared to net losses in 2018 on equity securities in PSEG Power’s NDT Fund.