Fair Value Measurements (Schedule Of Quantitative Information About Level 3 Fair Value Measurements) (Detail) (USD $) In Millions, unless otherwise specified							3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended					3 Months Ended	12 Months Ended	3 Months Ended					12 Months Ended	3 Months Ended					12 Months Ended
	Mar. 31, 2014 Power [Member]	Dec. 31, 2013 Power [Member]	Mar. 31, 2014 PSE And G [Member]	Dec. 31, 2013 PSE And G [Member]	Mar. 31, 2014 PSEG [Member]	Dec. 31, 2013 PSEG [Member]	Mar. 31, 2014 Electric Swaps [Member] Power [Member]	Dec. 31, 2013 Electric Swaps [Member] Power [Member]	Mar. 31, 2014 Electric Load Contracts [Member] Power [Member]	Dec. 31, 2013 Electric Load Contracts [Member] Power [Member]	Mar. 31, 2014 Various [Member] Power [Member]		Dec. 31, 2013 Various [Member] Power [Member]		Mar. 31, 2014 Forward Contracts [Member] PSE And G [Member]	Dec. 31, 2013 Forward Contracts [Member] PSE And G [Member]	Mar. 31, 2014 Minimum [Member] Electric Load Contracts [Member] Power [Member]	Mar. 31, 2013 Minimum [Member] Electric Load Contracts [Member] Power [Member]	Mar. 31, 2014 Minimum [Member] MWh [Member] Electric Swaps [Member] Power [Member] MWh	Mar. 31, 2013 Minimum [Member] MWh [Member] Electric Swaps [Member] Power [Member] MWh	Mar. 31, 2014 Minimum [Member] MWh [Member] Forward Contracts [Member] PSE And G [Member]	Dec. 31, 2013 Minimum [Member] MWh [Member] Forward Contracts [Member] PSE And G [Member]	Mar. 31, 2014 Maximum [Member] Electric Load Contracts [Member] Power [Member]	Mar. 31, 2013 Maximum [Member] Electric Load Contracts [Member] Power [Member]	Mar. 31, 2014 Maximum [Member] MWh [Member] Electric Swaps [Member] Power [Member] MWh	Mar. 31, 2013 Maximum [Member] MWh [Member] Electric Swaps [Member] Power [Member] MWh	Mar. 31, 2014 Maximum [Member] MWh [Member] Forward Contracts [Member] PSE And G [Member]	Dec. 31, 2013 Maximum [Member] MWh [Member] Forward Contracts [Member] PSE And G [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value	$ 3	$ 4	$ 20	$ 94	$ 23	$ 98	$ 0	$ 3	$ 1	$ 0	$ 2	[1]	$ 1	[2]	$ 20	$ 94
Liabilities, Fair Value	$ (14)	$ (10)	$ (8)	$ 0	$ (22)	$ (10)	$ (5)	$ (1)	$ (9)	$ (8)	$ 0	[1]	$ (1)	[2]	$ (8)	$ 0
Valuation Technique (s)							Discounted Cash Flow	Discounted Cash Flow	Discounted Cash Flow	Discounted Cash Flow					Discounted Cash Flow	Discounted Cash Flow
Significant Unobservable Inputs							Power Basis	Power Basis	Historic Load Variability	Historic Load Variability					Transportation Costs	Transportation Costs
Power Basis Range																			(3)	0					10	10
Historic Load Variability																	0.00%	(5.00%)					10.00%	10.00%
Transportation Costs																					0.70	0.70					1.00	1.00

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

[2] Includes gas supply positions which were immaterial as of December 31, 2013.