Fair Value Measurements (Changes In Level 3 Assets And (Liabilities) Measured At Fair Value On A Recurring Basis) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Settlements		$ 21	$ 20
Net Assets Measured At Fair Value On A Recurring Basis		2,600	2,500
Net Assets Measured At Fair Value On A Recurring Basis Measured Using Unobservable Input And Classified As Level3		1	13
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		13	20
Net Derivative Assets (Liabilities) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs			13		$ 37
Opening Balance		13
Included in Income	[1]	13	20
Included in Regulatory Assets/Liabilities	[2]	(7)	(24)
Purchases, (Sales)		(3)	0
Issuances (Settlements)	[3]	21	(20)
Transfers In (Out)		0	0
Closing Balance		1	13
Net Derivative Assets (Liabilities) [Member] | Power [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs			11		11
Opening Balance		11
Included in Income	[1]	13	20
Included in Regulatory Assets/Liabilities	[2]	0	0
Purchases, (Sales)		(3)	0
Issuances (Settlements)	[3]	(21)	(20)
Transfers In (Out)		0	0
Closing Balance		6	11
Net Derivative Assets (Liabilities) [Member] | PSE&G [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs			2		$ 26
Opening Balance		2
Included in Income	[1]	0	0
Included in Regulatory Assets/Liabilities		(7)	(24)	[2]
Purchases, (Sales)		0	0
Issuances (Settlements)	[3]	0	0
Transfers In (Out)		0	0
Closing Balance		$ (5)	$ 2

[1] PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $13 million and $20 million in Operating Income in 2016 and 2015, respectively. Of the $13 million in Operating Income in 2016 $(5) million is unrealized. The $20 million in Operating Income in 2015 is realized.

[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 $(21) million and $(20) million in settlements for derivative contracts in 2016 and 2015, respectively.