Fair Value Measurements (Changes In Level 3 Assets And (Liabilities) Measured At Fair Value On A Recurring Basis) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Settlements	$ (4)		$ (1)		$ 54		$ 9
Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gains and losses attributable to changes in net derivative assets and liabilities, included in Operating Income	(8)		1		(66)		(16)
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized	(12)		1		(11)		(7)
Net Derivative Assets (Liabilities) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance	13		(35)		88		(31)
Included in Income	(8)	[1]	1	[1]	(66)	[1]	(16)	[1]
Included in Regulatory Assets/Liabilities	(9)	[2]	(11)	[2]	(81)	[2]	(12)	[2]
Purchases, (Sales)	0		0		0		0
Issuances (Settlements)	(4)	[3]	(1)	[3]	54	[3]	9	[3]
Transfers In (Out)	0	[4]	0	[4]	(3)	[4]	4	[4]
Closing Balance	(8)		(46)		(8)		(46)
Net Derivative Assets (Liabilities) [Member] | Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance	(9)		6		(6)		9
Included in Income	(8)	[1]	1	[1]	(66)	[1]	(16)	[1]
Included in Regulatory Assets/Liabilities	0	[2]	0	[2]	0	[2]	0	[2]
Purchases, (Sales)	0		0		0		0
Issuances (Settlements)	(4)	[3]	(1)	[3]	54	[3]	9	[3]
Transfers In (Out)	0	[4]	0	[4]	(3)	[4]	4	[4]
Closing Balance	(21)		6		(21)		6
Net Derivative Assets (Liabilities) [Member] | PSE And G [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance	22		(41)		94		(40)
Included in Income	0	[1]	0	[1]	0	[1]	0	[1]
Included in Regulatory Assets/Liabilities	(9)	[2]	(11)	[2]	(81)	[2]	(12)	[2]
Purchases, (Sales)	0		0		0		0
Issuances (Settlements)	0	[3]	0	[3]	0	[3]	0	[3]
Transfers In (Out)	0	[4]	0	[4]	0	[4]	0	[4]
Closing Balance	$ 13		$ (52)		$ 13		$ (52)

[1] PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $(8) million and $(66) million in Operating Income for the three months and nine months ended September 30, 2014, respectively. Of the $(8) million in Operating Income $(12) million is unrealized. Of the $(66) million in Operating Income, $(11) million is unrealized.

[2] Mainly includes gains/losses on PSE&G’s derivative contracts that are not included in either earnings or Other Comprehensive Income, as they are deferred as a Regulatory Asset/Liability and are expected to be recovered from/returned to PSE&G’s customers.

[3] Represents $(4) million and $54 million in settlements for the three months and nine months ended September 30, 2014. Represents $(1) million and $9 million in settlements for the three months and nine months ended September 30, 2013

[4] three months ended September 30, 2014 and 2013. During the nine months ended September 30, 2014, $(3) million, of net derivatives assets/liabilities were transferred from Level 3 to Level 2 due to more observable pricing for the underlying securities. During the nine months ended September 30, 2013, $4 million, of net derivatives assets/liabilities were transferred from Level 3 to Level 2 due to more observable pricing for the underlying securities. The transfers were recognized as of the beginning of the quarters in which the transfers first occurred, as per PSEG's policy.