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
	Mar. 31, 2014		Mar. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Settlements	$ 59		$ 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	(64)		(34)
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized	(5)		(24)
Derivative [Member] | Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers In (Out)	0
Net Derivative Assets (Liabilities) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance	88		(31)
Included in Income	(64)	[1]	(34)	[1]
Included in Regulatory Assets/Liabilities	(82)	[2]	0	[2]
Purchases, (Sales)	0		0
Issuances (Settlements)	59	[3]	10	[3]
Transfers In (Out)	0	[4]	(2)	[4]
Closing Balance	1		(57)
Net Derivative Assets (Liabilities) [Member] | Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance	(6)		9
Included in Income	(64)	[1]	(34)	[1]
Included in Regulatory Assets/Liabilities	0	[2]	0	[2]
Purchases, (Sales)	0		0
Issuances (Settlements)	59	[3]	10	[3]
Transfers In (Out)	0	[4]	(2)	[4]
Closing Balance	(11)		(17)
Net Derivative Assets (Liabilities) [Member] | PSE And G [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance	94		(40)
Included in Income	0	[1]	0	[1]
Included in Regulatory Assets/Liabilities	(82)	[2]	0	[2]
Purchases, (Sales)	0		0
Issuances (Settlements)	0	[3]	0	[3]
Transfers In (Out)	0	[4]	0	[4]
Closing Balance	$ 12		$ (40)

[1] PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $(64) million and $(34) million in Operating Income in 2014 and 2013, respectively. Of the $(64) million in Operating Income in 2014, $(5) million is unrealized. Of the $(34) million in Operating Income in 2013, $(24) million is unrealized.

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

[3] Represents $59 million and $10 million in settlements for the three months ended March 31, 2014 and 2013.

[4] There were no transfers among levels during the three months ended March 31, 2014. During the three months ended March 31, 2013, $2 million of net derivatives assets/liabilities were transferred from Level 3 to Level 2 due to more observable pricing for the underlying securities. The transfer was recognized as of the beginning of the first quarter (i.e. the quarter in which the transfer occurred), as per PSEG's policy.