Financial Risk Management Activities (Schedule Of Derivative Instruments Fair Value In Balance Sheets) (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	$ (55)	$ 24
Derivative Contracts, Current Assets	242	240
Derivative Contracts, Noncurrent Assets	77	77
Total Mark-to-Market Derivative Assets	319	317
Derivative Contracts, Current Liabilities	(76)	(132)
Derivative Contracts, Noncurrent Liabilities	(27)	(33)
Total Mark-to-Market Derivative (Liabilities)	(103)	(165)
Net Mark-to-Market Derivative Assets (Liabilities)	216	152
Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	223	207	[1]
Derivative Contracts, Noncurrent Assets	77	62	[1]
Total Mark-to-Market Derivative Assets	300	269	[1]
Derivative Contracts, Current Liabilities	(76)	(132)	[1]
Derivative Contracts, Noncurrent Liabilities	(16)	(33)	[1]
Total Mark-to-Market Derivative (Liabilities)	(92)	(165)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	208	104	[1]
Power [Member] | Netting [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	(477)	(408)	[1],[2]
Derivative Contracts, Noncurrent Assets	(131)	(109)	[1],[2]
Total Mark-to-Market Derivative Assets	(608)	(517)	[1],[2]
Derivative Contracts, Current Liabilities	437	436	[1],[2]
Derivative Contracts, Noncurrent Liabilities	116	105	[1],[2]
Total Mark-to-Market Derivative (Liabilities)	553	541	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	(55)	24	[1],[2]
Power [Member] | Energy-Related Contracts [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	0	18	[1]
Derivative Contracts, Noncurrent Assets	0	0	[1]
Total Mark-to-Market Derivative Assets	0	18	[1]
Derivative Contracts, Current Liabilities	0	0	[1]
Derivative Contracts, Noncurrent Liabilities	0	0	[1]
Total Mark-to-Market Derivative (Liabilities)	0	0	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	0	18	[1]
PSE&G [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	13	18
Derivative Contracts, Noncurrent Assets	0	8
Derivative Contracts, Noncurrent Liabilities	(11)	0
PSEG [Member] | Interest Rate Swaps [Member] | Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	6	15	[1]
Derivative Contracts, Noncurrent Assets	0	7	[1]
Total Mark-to-Market Derivative Assets	6	22	[1]
Derivative Contracts, Current Liabilities	0	0	[1]
Derivative Contracts, Noncurrent Liabilities	0	0	[1]
Total Mark-to-Market Derivative (Liabilities)	0	0	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	6	22	[1]
Not Designated as Hedging Instrument [Member] | Power [Member] | Energy-Related Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	700	597	[1]
Derivative Contracts, Noncurrent Assets	208	171	[1]
Total Mark-to-Market Derivative Assets	908	768	[1]
Derivative Contracts, Current Liabilities	(513)	(568)	[1]
Derivative Contracts, Noncurrent Liabilities	(132)	(138)	[1]
Total Mark-to-Market Derivative (Liabilities)	(645)	(706)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	263	62	[1]
Not Designated as Hedging Instrument [Member] | PSE&G [Member] | Energy-Related Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	13	18	[1]
Derivative Contracts, Noncurrent Assets	0	8	[1]
Total Mark-to-Market Derivative Assets	13	26	[1]
Derivative Contracts, Current Liabilities	0	0	[1]
Derivative Contracts, Noncurrent Liabilities	(11)	0	[1]
Total Mark-to-Market Derivative (Liabilities)	(11)	0	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	2	26	[1]
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	(53)	(4)
Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	(16)	(8)
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	12	32
Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	$ 2	$ 4

[1] Substantially all of Power's and PSEG's derivative instruments are contracts subject to master netting agreements. Contracts not subject to master netting or similar agreements are immaterial and did not have any collateral posted or received as of December 31, 2015 and 2014. PSE&G does not have any derivative contracts subject to master netting or similar agreements.

[2] Represents the netting of fair value balances with the same counterparty (where the right of offset exists) and the application of collateral. All cash collateral received or posted that has been allocated to derivative positions, where the right of offset exists, has been offset in the Consolidated Balance Sheets. As of December 31, 2015 and 2014, net cash collateral (received) paid of $(55) million and $24 million, respectively, were netted against the corresponding net derivative contract positions. Of the $(55) million as of December 31, 2015, $(53) million and $(16) million were netted against current assets and noncurrent assets, respectively, and $12 million and $2 million were netted against current liabilities and noncurrent liabilities, respectively. Of the $24 million as of December 31, 2014, cash collateral of $(4) million and $(8) million were netted against current assets and noncurrent assets, respectively, and $32 million and $4 million were netted against current liabilities and noncurrent liabilities, respectively.