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, 2017		Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016
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, unrealized				$ (4)			$ (4)
Settlements		$ (3)		(5)	$ (25)		(20)
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		7		1	26		16
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		3		21	1		13
Included in Income		7	[1]	1	(26)	[1]	(16)	[1]
Included in Regulatory Assets/Liabilities	[2]	(1)		(12)	5		(4)
Purchases, (Sales)		0		0	0		0
Issuances (Settlements)	[3]	(3)		(5)	(25)		(20)
Transfers In (Out)	[4]	0		0	(1)		0
Closing Balance		6		5	6		5
Net Derivative Assets (Liabilities) [Member] | Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance		2		11	6		11
Included in Income		7	[1]	1	(26)	[1]	(16)	[1]
Included in Regulatory Assets/Liabilities	[2]	0		0	0		0
Purchases, (Sales)		0		0	0		0
Issuances (Settlements)	[3]	(3)		(5)	(25)		(20)
Transfers In (Out)	[4]	0		0	(1)		0
Closing Balance		6		7	6		7
Net Derivative Assets (Liabilities) [Member] | PSE And G [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance		1		10	(5)		2
Included in Income		0	[1]	0	0	[1]	0	[1]
Included in Regulatory Assets/Liabilities	[2]	(1)		(12)	5		(4)
Purchases, (Sales)		0		0	0		0
Issuances (Settlements)	[3]	0		0	0		0
Transfers In (Out)	[4]	0		0	0		0
Closing Balance		$ 0		$ (2)	$ 0		$ (2)

[1] PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $7 million and $26 million in Operating Income for the three months and six months ended June 30, 2017, respectively. Of the $7 million in Operating Income, $4 million is unrealized. Of the $26 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 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.

[3] Represents $(3) million and $(25) million in settlements for the three months and six months ended June 30, 2017, respectively.

[4] During the three months ended June 30, 2017 there were no transfers in to or out of Level 3. During the six months ended June 30, 2017, $(1) million of net derivatives assets/liabilities were transferred from Level 2 to Level 3. There were no transfers in to or out of Level 3 during three months and six months ended June 30, 2016.