Earnings Per Share (EPS) And Dividends (Basic And Diluted Earnings Per Share Computation) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Earnings Per Share, Diluted [Line Items]
Net Income	$ 1,905	[1]	$ 1,693	[1]	$ 1,438
Effect of Stock Based Compensation Awards, Basic	0		0		0
Total Shares, Basic	504,000		504,000		504,000
Effect of Stock Based Compensation Awards, Diluted	3,000		3,000		3,000
Total Shares, Diluted	507,000		507,000		507,000
Weighted Average Common Shares Outstanding Before Various Effects Basic	504,000		504,000		504,000
Weighted Average Common Shares Outstanding Before Various Effects Diluted	504,000		504,000		504,000
Earnings Per Share, Basic	$ 3.78		$ 3.35		$ 2.85
Earnings Per Share, Diluted	$ 3.76		$ 3.33		$ 2.83

[1] Includes an after-tax gain of $86 million in the year ended December 31, 2020 related to the sale of PSEG Power’s interest in the Yards Creek generation facility and an after-tax loss of $286 million in the year ended December 31, 2019 related to the sale of PSEG Power’s ownership interests in the Keystone and Conemaugh fossil generation plants. See Note 4. Early Plant Retirements/Asset Dispositions for additional information.