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												6 Months Ended		12 Months Ended
	Dec. 31, 2018		Sep. 30, 2018	Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017		Mar. 31, 2017		Jun. 30, 2018		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share, Diluted [Line Items]
Net Income															$ 1,438	$ 1,574	$ 887
Effect of Stock Based Compensation Awards, Basic															0	0	0
Total Shares, Basic	504,000		504,000	504,000		505,000		505,000	505,000		505,000		504,000		504,000	505,000	505,000
Effect of Stock Based Compensation Awards, Diluted															3,000	2,000	3,000
Total Shares, Diluted	508,000		507,000	507,000		508,000		507,000	507,000		508,000		507,000		507,000	507,000	508,000
Weighted Average Common Shares Outstanding Before Various Effects Basic															504,000	505,000	505,000
Weighted Average Common Shares Outstanding Before Various Effects Diluted															504,000	505,000	505,000
Earnings Per Share, Basic	$ 0.39	[1]	$ 0.82	$ 1.11	[1]	$ 1.89	[1]	$ 0.78	$ 0.22	[1]	$ 0.23	[1]	$ 0.53	[1]	$ 2.85	$ 3.12	$ 1.76
Earnings Per Share, Diluted	$ 0.39	[1]	$ 0.81	$ 1.10	[1]	$ 1.88	[1]	$ 0.78	$ 0.22	[1]	$ 0.22	[1]	$ 0.53	[1]	$ 2.83	$ 3.10	$ 1.75
Stock Options Excluded from Weighted Average Common Shares used for diluted EPS																	400

[1] The increases in Operating Income at PSEG consolidated and Power in the first and second quarters of 2018 as compared to the same quarters in 2017 were primarily due to higher costs in 2017 related to closing the coal/gas Hudson and Mercer units, which were fully depreciated as of June 1, 2017. The increases in Operating Income at PSEG consolidated and Power in the fourth quarter 2018 as compared to the same quarter in 2017 were primarily due to lower MTM losses and a gain on the sale of the Hudson and Mercer units.The decreases in Net Income at PSEG consolidated and Power in the fourth quarter 2018 as compared to the same quarter in 2017 also reflected the impact of the one-time benefit recorded in December 2017 as a result of the remeasurement of deferred tax balances and the inclusion in 2018 of net unrealized losses on equity investments in the NDT Fund in accordance with new accounting guidance.