Earnings Per Share (EPS) And Dividends (Basic And Diluted Earnings Per Share Computation) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2021		Sep. 30, 2020		Sep. 30, 2021		Sep. 30, 2020
Net Income	$ (1,564)	[1]	$ 575	[2]	$ (1,093)	[1]	$ 1,474	[2]
Weighted Average Common Shares Outstanding, Basic (shares)	504		504		504		504
Effect of Stock Based Compensation Awards, Basic (shares)	0		0		0		0
Total Shares, Basic (shares)	504		504		504		504
Net Income, Basic (dollars per share)	$ (3.10)		$ 1.15		$ (2.17)		$ 2.93
Weighted Average Common Shares Outstanding, Diluted (shares)	504		504		504		504
Effect of Stock Based Compensation Awards, Diluted (shares)	0		3		0		3
Total Shares, Diluted (shares)	504		507		504		507
Net Income, Diluted (dollars per share)	$ (3.10)		$ 1.14		$ (2.17)		$ 2.91

[1] Includes after-tax impairment losses and other charges related to the pending sale of the Fossil generating assets at PSEG Power of $1,563 million and $1,936 million for the three and nine months ended September 30, 2021, respectively. See Note 4. Early Plant Retirements/Asset Dispositions and Impairments for additional information. Also includes net after-tax losses of $478 million and $718 million for the three and nine months ended September 30, 2021 related to the impacts of non-trading commodity mark-to-market activity, which consist of the financial impact from positions with future delivery dates.

[2] Includes an after-tax gain of $86 million in the three and nine months ended September 30, 2020 related to the sale of PSEG Power’s interest in the Yards Creek generation facility. See Note 4. Early Plant Retirements/Asset Dispositions and Impairments