Earnings Per Share (EPS) And Dividends (Basic And Diluted Earnings Per Share Computation) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Earnings Per Share, Diluted [Line Items]
Net Income													$ 1,693	$ 1,438	$ 1,574
Effect of Stock Based Compensation Awards, Basic													0	0	0
Total Shares, Basic	504,000		504,000	504,000		504,000	504,000		504,000	504,000		504,000	504,000	504,000	505,000
Effect of Stock Based Compensation Awards, Diluted													3,000	3,000	2,000
Total Shares, Diluted	507,000		507,000	507,000		507,000	508,000		507,000	507,000		507,000	507,000	507,000	507,000
Weighted Average Common Shares Outstanding Before Various Effects Basic													504,000	504,000	505,000
Weighted Average Common Shares Outstanding Before Various Effects Diluted													504,000	504,000	505,000
Earnings Per Share, Basic	$ 0.86	[1]	$ 0.80	$ 0.30	[2]	$ 1.39	$ 0.39	[1]	$ 0.82	$ 0.53	[2]	$ 1.11	$ 3.35	$ 2.85	$ 3.12
Earnings Per Share, Diluted	$ 0.86	[1]	$ 0.79	$ 0.30	[2]	$ 1.38	$ 0.39	[1]	$ 0.81	$ 0.53	[2]	$ 1.10	$ 3.33	$ 2.83	$ 3.10

[1] 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.

[2] 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.