Long-Term Investments (Schedule Of Long Term Investments) (Details) - USD ($) $ in Millions		3 Months Ended				12 Months Ended
		Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Long-Term Investments [Line Items]
Total Long-Term Investments				$ 1,050		$ 932	$ 1,050
Dividends in equity method investments						18	18	$ 16
Provision for Loan and Lease Losses		$ 7	$ 55	10	$ 137
Financing Receivable, Allowance for Credit Losses, Write-downs		$ 15
Power [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments				102		87	102
PSE&G [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments				299		280	299
Life Insurance And Supplemental Benefits [Member] | PSE&G [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments				140		130	140
Solar Loan Investments [Member] | PSE&G [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments				159		150	159
Lease Investments [Member] | Energy Holdings [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments				649		565	649
Partnerships And Corporate Joint Ventures [Member] | Power [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	[1]			$ 102		$ 87	$ 102

[1] During the three years ended December 31, 2017, 2016 and 2015, dividends from these investments were $18 million, $18 million and $16 million, respectively.