Financial Risk Management Activities (Schedule Of Gross Volume, On Absolute Basis For Derivative Contracts) (Detail)	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended						12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended			12 Months Ended	9 Months Ended
	Sep. 30, 2014 Natural Gas Dth [Member]	Dec. 31, 2013 Natural Gas Dth [Member]	Sep. 30, 2014 Electricity MWh [Member]	Dec. 31, 2013 Electricity MWh [Member]	Sep. 30, 2014 FTRs MWh [Member]	Dec. 31, 2013 FTRs MWh [Member]	Sep. 30, 2014 Interest Rate Swaps [Member]	Dec. 31, 2013 Interest Rate Swaps [Member]	Sep. 30, 2014 PSEG [Member] Natural Gas Dth [Member]	Sep. 30, 2013 PSEG [Member] Natural Gas Dth [Member]	Sep. 30, 2014 PSEG [Member] Electricity MWh [Member]	Sep. 30, 2013 PSEG [Member] Electricity MWh [Member]	Sep. 30, 2014 PSEG [Member] FTRs MWh [Member]	Sep. 30, 2014 PSEG [Member] Interest Rate Swaps [Member]	Dec. 31, 2013 PSEG [Member] Interest Rate Swaps [Member]	Sep. 30, 2014 Power [Member] Natural Gas Dth [Member]	Dec. 31, 2013 Power [Member] Natural Gas Dth [Member]	Sep. 30, 2014 Power [Member] Electricity MWh [Member]	Dec. 31, 2013 Power [Member] Electricity MWh [Member]	Sep. 30, 2014 Power [Member] FTRs MWh [Member]	Dec. 31, 2013 Power [Member] FTRs MWh [Member]	Sep. 30, 2014 Power [Member] Interest Rate Swaps [Member]	Sep. 30, 2013 Power [Member] Interest Rate Swaps [Member]	Sep. 30, 2014 PSE And G [Member] Natural Gas Dth [Member]	Dec. 31, 2013 PSE And G [Member] Natural Gas Dth [Member]	Sep. 30, 2014 PSE And G [Member] Electricity MWh [Member]	Sep. 30, 2013 PSE And G [Member] Electricity MWh [Member]	Sep. 30, 2014 PSE And G [Member] FTRs MWh [Member]	Sep. 30, 2013 PSE And G [Member] FTRs MWh [Member]	Sep. 30, 2014 PSE And G [Member] Interest Rate Swaps [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis	341,000,000	614,000,000	329,000,000	243,000,000	21,000,000	16,000,000	850,000,000	850,000,000	0	0	0	0	0	850,000,000	850,000,000	277,000,000	466,000,000	329,000,000	243,000,000	21,000,000	16,000,000	0	0	64,000,000	148,000,000	0	0	0	0	0