Financial Risk Management Activities (Schedule Of Derivative Instruments Designated As Cash Flow Hedges) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011		Sep. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) attributed to cash flow hedges reclassified from AOCI into Operating Revenue (effective portion)			$ 182
PSEG [Member] | Operating Revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) attributed to cash flow hedges reclassified from AOCI into Operating Revenue (effective portion)	60	60	152	[1]	178	[1]
Amount of gain (loss) attributed to cash flow hedges recognized in income (ineffective portion)	0	0	1	[1]	(3)	[1]
PSEG [Member] | Energy Costs [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) attributed to cash flow hedges reclassified from AOCI into Energy Costs (effective portion)	0	0	2	[1]	(2)	[1]
PSEG [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) attributed to cash flow hedges reclassified from AOCI into Earnings (effective portion)	0	0	(1)	[1]	(1)	[1]
PSEG [Member] | Interest Expense [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) attributed to cash flow hedges recognized in income (ineffective portion)	0	0
PSEG [Member] | Energy-Related Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) attributed to cash flow hedges recognized in AOCI, effective portion	21	62	18	[1]	171	[1]
PSEG [Member] | Energy-Related Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) attributed to cash flow hedges recognized in AOCI, effective portion	0	0	1	[1]	1	[1]
Amount of gain (loss) attributed to cash flow hedges recognized in income (ineffective portion)	0	0	0	[1]	0	[1]
PSEG [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) attributed to cash flow hedges recognized in AOCI, effective portion	0	0	0	[1]	0	[1]
Amount of gain (loss) attributed to cash flow hedges recognized in income (ineffective portion)			0	[1]	0	[1]
PSEG [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) attributed to cash flow hedges recognized in AOCI, effective portion	21	62	19	[1]	172	[1]
Amount of gain (loss) attributed to cash flow hedges reclassified from AOCI into Earnings (effective portion)	60	60	153	[1]	175	[1]
Amount of gain (loss) attributed to cash flow hedges recognized in income (ineffective portion)	$ 0	$ 0	$ 1	[1]	$ (3)	[1]

[1] Includes amounts for PSEG parent.