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, 2018		Jun. 30, 2017	Jun. 30, 2018		Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Settlements				$ (3)	$ 1		$ (25)
Net Derivative Assets (Liabilities) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance		$ 7		3	7		1
Included in Income		(3)	[1]	7	4	[1]	(26)	[1]
Included in Regulatory Assets/Liabilities	[2]	0		(1)	0		5
Purchases, (Sales)		0		0	0		0
Issuances (Settlements)	[3]	0		(3)	1		(25)
Transfers In (Out)	[4]	0		0	0		(1)
Closing Balance		4		6	4		6
Net Derivative Assets (Liabilities) [Member] | Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance		7		2	7		6
Included in Income		(3)	[1]	7	4	[1]	(26)	[1]
Included in Regulatory Assets/Liabilities	[2]	0		0	0		0
Purchases, (Sales)		0		0	0		0
Issuances (Settlements)	[3]	0		(3)	1		(25)
Transfers In (Out)	[4]	0		0	0		(1)
Closing Balance		4		6	4		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				1			(5)
Included in Income				0			0	[1]
Included in Regulatory Assets/Liabilities	[2]			(1)			5
Purchases, (Sales)				0			0
Issuances (Settlements)	[3]			0			0
Transfers In (Out)	[4]			0			0
Closing Balance				0			0
Operating Revenues [Member] | 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				3			17
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized		(7)		2	1		(2)
Energy Costs [Member] | 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		3		4	(6)		9
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized		$ 4		$ 2	$ (5)		$ 3

[1] PSEG’s and Power’s gains(losses) attributable to changes in net derivative assets and liabilities for the three months and six months ended June 30, 2018 include $(7) million and $1 million, respectively, in Operating Revenues and $4 million and $(5) million, respectively, in Energy Costs. Both the $(7) million and $1 million in Operating Revenues are unrealized. Of the $4 million and $(5) million in Energy Costs, $3 million and $(6) million are unrealized. Unrealized gains (losses) represent the change in derivative assets and liabilities still held at the end of the reporting period.

[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 $1 million in settlements for the six months ended June 30, 2018. Represents settlements of $(3) million and $(25) million for the three months and six months ended June 30, 2017, respectively.

[4] During the three months and six months ended June 30, 2018, there were no transfers into or out of Level 3. During the six months ended June 30, 2017, $(1) million of net derivatives were transferred from Level 2 to Level 3.