Fair Value Measurements (Schedule Of Quantitative Information About Level 3 Fair Value Measurements) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
PSEG [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 98		$ 80
Financial and Nonfinancial Liabilities, Fair Value Disclosure	10		111
Power [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	4		13
Financial and Nonfinancial Liabilities, Fair Value Disclosure	10		4
Power [Member] | Electric Swaps [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	3		7
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	Power Basis		Power Basis
Power [Member] | Electric Swaps [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Power Basis Range	0		0
Power [Member] | Electric Swaps [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Power Basis Range	10		10
Power [Member] | Electric Load Contracts [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	0		1
Financial and Nonfinancial Liabilities, Fair Value Disclosure	8		2
Fair Value Measurements, Valuation Techniques	Discounted cash flow		Discounted Cash Flow
Fair Value Measurement With Significant Unobservable Inputs	Historic Load Variability		Historic Load Variability
Power [Member] | Electric Load Contracts [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Historic Load Variability	(5.00%)		(5.00%)
Power [Member] | Electric Load Contracts [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Historic Load Variability	10.00%		10.00%
Power [Member] | Various [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	1	[1]	5	[1]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	1	[1]	1	[1]
PSE&G [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	94		67
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0		107
PSE&G [Member] | Forward Contracts [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	94		67	[2]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 0		$ 107	[2]
Fair Value Measurements, Valuation Techniques	Discounted Cash Flow		Discounted Cash Flow
Fair Value Measurement With Significant Unobservable Inputs	Transportation Costs		Long-Term Gas Basis and Capacity Prices
Megawatt Day [Member] | Long Term Electric Capacity [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forecasted Capacity Prices Range	100
Megawatt Day [Member] | Long Term Electric Capacity [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forecasted Capacity Prices Range	400
Mmbtu [Member] | Long Term Gas Supply [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Longer Term Basis Range	0
Mmbtu [Member] | Long Term Gas Supply [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Longer Term Basis Range	4

[1] Includes gas supply positions which are immaterial as of December 31, 2013 and 2012. Also includes long-term electric capacity positions which are immaterial as of December 31, 2012.

[2] Includes long-term electric capacity and long-term gas supply positions with various unobservable inputs. Unobservable inputs for the long-term electric capacity contracts include forecasted capacity prices in the range of $100 to $400/MW day. Significant unobservable inputs for the gas supply contracts include long-term basis prices in the range of $0 to $4/MMBTU of natural gas.