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				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Settlements	$ (1)				$ 58		$ 10
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	6				(58)
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized					1
Net Derivative Assets (Liabilities) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance	1		(57)		88		(31)
Included in Income	6	[1]	17	[1]	(58)	[1]	(17)	[1]
Included in Regulatory Assets/Liabilities	10	[2]	(1)	[2]	(72)	[2]	(1)	[2]
Purchases, (Sales)	0		0		0		0
Issuances (Settlements)	(1)	[3]	0	[3]	58	[3]	10	[3]
Transfers In (Out)	(3)	[4]	6	[4]	(3)	[4]	4	[4]
Closing Balance	13		(35)		13		(35)
Net Derivative Assets (Liabilities) [Member] | Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance	(11)		(17)		(6)		9
Included in Income	6	[1]	17	[1]	(58)	[1]	(17)	[1]
Included in Regulatory Assets/Liabilities	0	[2]	0	[2]	0	[2]	0	[2]
Purchases, (Sales)	0		0		0		0
Issuances (Settlements)	(1)	[3]	0	[3]	58	[3]	10	[3]
Transfers In (Out)	(3)	[4]	6	[4]	(3)	[4]	4	[4]
Closing Balance	(9)		6		(9)		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	12		(40)		94		(40)
Included in Income	0	[1]	0	[1]	0	[1]	0	[1]
Included in Regulatory Assets/Liabilities	10	[2]	(1)	[2]	(72)	[2]	(1)	[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	$ 22		$ (41)		$ 22		$ (41)

[1] PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $6 million and $(58) million in Operating Income for the three months and six months ended June 30, 2014, respectively. The $6 million in Operating Income is unrealized. Of the $(58) million in Operating Income, $1 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 $(1) million and $58 million in settlements for the three months and six months ended June 30, 2014. Includes $10 million in settlements for the six months ended June 30, 2013

[4] During the three months and six months ended June 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 three months and six months ended June 30, 2013, $6 million and $4 million, respectively, 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.