Fair Value Measurements (Schedule Of Quantitative Information About Level 3 Fair Value Measurements) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 25		$ 38
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(12)		(1)
PSE&G [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	13		26
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(11)		0
Power [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	12		12
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(1)		(1)
Forward Contracts [Member] | PSE&G [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	13		26	[1]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ (11)		$ 0	[1]
Fair Value Measurements, Valuation Techniques	Discounted Cash Flow		Discounted Cash Flow
Fair Value Measurement With Significant Unobservable Inputs	Transportation Costs		Transportation Costs
Forward Contracts [Member] | Megawatt Hours [Member] | PSE&G [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Transportation Costs	0.60		0.70
Forward Contracts [Member] | Megawatt Hours [Member] | PSE&G [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Transportation Costs	0.80		1.00
Electric Load Contracts [Member] | Power [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 11		$ 12
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ (1)		$ (1)
Fair Value Measurements, Valuation Techniques	Discounted Cash flow		Discounted Cash Flow
Fair Value Measurement With Significant Unobservable Inputs	Historic Load Variability		Historic Load Variability
Electric Load Contracts [Member] | Power [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Historic Load Variability	0.00%		0.00%
Electric Load Contracts [Member] | Power [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Historic Load Variability	10.00%		10.00%
Various [Member] | Power [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 1	[2]	$ 0	[1]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 0	[2]	$ 0	[1]

[1] Includes gas supply positions and long-term electric capacity positions which were immaterial as of December 31, 2014.

[2] Includes long-term electric capacity positions which were immaterial as of December 31, 2015.