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	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Settlements	$ 8		$ (57)
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	(27)		42
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized	(19)		(15)
Derivative [Member] | Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers In (Out)	(4)
Net Derivative Assets (Liabilities) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance	(31)		21
Included in Income	(27)	[1]	42	[1]
Included in Regulatory Assets/Liabilities	134	[2]	(37)	[2]
Purchases, (Sales)	0		0
Issuances (Settlements)	8	[3]	(57)	[3]
Transfers In (Out)	4	[4]	0	[4]
Closing Balance			(31)
Net Derivative Assets (Liabilities) [Member] | PSEG [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Closing Balance	88		(31)
Net Derivative Assets (Liabilities) [Member] | Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance	9		24
Included in Income	(27)	[1]	42	[1]
Included in Regulatory Assets/Liabilities	0	[2]	0	[2]
Purchases, (Sales)	0		0
Issuances (Settlements)	8	[3]	(57)	[3]
Transfers In (Out)	4	[4]	0	[4]
Closing Balance	(6)		9
Net Derivative Assets (Liabilities) [Member] | PSE&G [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance	(40)		(3)
Included in Income	0	[1]	0	[1]
Included in Regulatory Assets/Liabilities	134	[2]	(37)	[2]
Purchases, (Sales)	0		0
Issuances (Settlements)	0	[3]	0	[3]
Transfers In (Out)	0	[4]	0	[4]
Closing Balance	94		(40)
Non Recourse Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance			(50)
Included in Income			50	[1]
Included in Regulatory Assets/Liabilities			0	[2]
Purchases, (Sales)			0
Issuances (Settlements)			0	[3]
Transfers In (Out)			0	[4]
Non Recourse Debt [Member] | PSEG [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Closing Balance			$ 0

[1] PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $(27) million and $42 million in Operating Income in 2013 and 2012, respectively. Of the $(27) million in Operating Income in 2013, $(19) million is unrealized. Of the $42 million in Operating Income in 2012, $(15) million is unrealized. Energy Holdings' release from its obligations under the non-recourse debt is included in PSEG's Operating Income and is offset by the write-off of the related assets.

[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. As discussed in Note 13. Commitments and Contingent Liabilities, PSE&G’s long-term electric capacity positions represented by the SOCA contracts have been terminated and the related derivative asset or liability and regulatory asset and liability reversed in the fourth quarter of 2013.

[3] Represents $8 million and $(57) million in settlements for derivative contracts in 2013 and 2012, respectively.

[4] During the year ended December 31, 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 (i.e. the quarter in which the transfers occurred), as per PSEG’s policy. During the year ended December 31, 2012, there were no transfers among levels.