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
		Mar. 31, 2016	Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Settlements		$ (15)	$ (12)
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		15	3
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized			(9)
Net Derivative Assets (Liabilities) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance		13	37
Included in Income	[1]	15	3
Included in Regulatory Assets/Liabilities	[2]	8	(19)
Purchases, (Sales)		0	0
Issuances (Settlements)	[3]	(15)	(12)
Transfers In (Out)	[4]	0	0
Closing Balance		21	9
Net Derivative Assets (Liabilities) [Member] | Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance		11	11
Included in Income	[1]	15	3
Included in Regulatory Assets/Liabilities	[2]	0	0
Purchases, (Sales)		0	0
Issuances (Settlements)	[3]	(15)	(12)
Transfers In (Out)	[4]	0	0
Closing Balance		11	2
Net Derivative Assets (Liabilities) [Member] | PSE And G [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Opening Balance		2	26
Included in Income	[1]	0	0
Included in Regulatory Assets/Liabilities	[2]	8	(19)
Purchases, (Sales)		0	0
Issuances (Settlements)	[3]	0	0
Transfers In (Out)	[4]	0	0
Closing Balance		$ 10	$ 7

[1] PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $15 million and $3 million in Operating Income in 2016 and 2015, respectively. The $15 million in Operating Income in 2016 is realized. Of the $3 million in Operating Income, $(9) 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 $(15) million and $(12) million in settlements for the three months ended March 31, 2016 and 2015.

[4] There were no transfers among levels during the three months ended March 31, 2016 and 2015.