Fair Value Measurements (Changes In Level 3 Assets And (Liabilities) Measured At Fair Value On A Recurring Basis) (Detail) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2016		Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Settlements		$ (5)		$ (4)		$ (20)		$ (16)
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		1		5		16		8
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized		(4)				(4)		(9)
Net Derivative Assets (Liabilities) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance		21		9		13		37
Included in Income		1	[1]	5	[2]	16	[1]	8	[2]
Included in Regulatory Assets/Liabilities	[3]	(12)		(2)		(4)		(21)
Purchases, (Sales)		0		0		0		0
Issuances (Settlements)	[4]	(5)		(4)		(20)		(16)
Transfers In (Out)	[5]	0		0		0		0
Closing Balance		5		8		5		8
Net Derivative Assets (Liabilities) [Member] | Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance		11		2		11		11
Included in Income		1	[1]	5	[2]	16	[1]	8	[2]
Included in Regulatory Assets/Liabilities	[3]	0		0		0		0
Purchases, (Sales)		0		0		0		0
Issuances (Settlements)	[4]	(5)		(4)		(20)		(16)
Transfers In (Out)	[5]	0		0		0		0
Closing Balance		7		3		7		3
Net Derivative Assets (Liabilities) [Member] | PSE And G [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance		10		7		2		26
Included in Income		0	[1]	0	[2]	0	[1]	0	[2]
Included in Regulatory Assets/Liabilities	[3]	(12)		(2)		(4)		(21)
Purchases, (Sales)		0		0		0		0
Issuances (Settlements)	[4]	0		0		0		0
Transfers In (Out)	[5]	0		0		0		0
Closing Balance		$ (2)		$ 5		$ (2)		$ 5

[1] PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $1 million and $16 million in Operating Income for the three months and six months ended June 30, 2016, respectively. Of the $1 million in Operating Income, $(4) million is unrealized. Of the $16 million in Operating Income, $(4) million is unrealized.

[2] PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $5 million and $8 million in Operating Income for the three months and six months ended June 30, 2015, respectively. The $5 million in Operating Income is realized. Of the $8 million in Operating Income, $(9) million is unrealized.

[3] Mainly includes gains/losses on PSE&G’s derivative contracts that are not included in either earnings or Accumulated 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.

[4] Represents $(5) million and $(20) million in settlements for the three months and six months ended June 30, 2016, respectively. Represents $(4) million and $(16) million in settlements for the three months and six months ended June 30, 2015, respectively.

[5] There were no transfers among levels during the three months and six months ended June 30, 2016 and 2015.