Financial Risk Management Activities (Schedule Of Derivative Instruments Fair Value In Balance Sheets) (Detail) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets		$ 230	$ 242
Derivative Contracts, Noncurrent Assets		133	77
Total Mark-to-Market Derivative Assets		363	319
Derivative Contracts, Current Liabilities		(53)	(76)
Derivative Contracts, Noncurrent Liabilities		(14)	(27)
Total Mark-to-Market Derivative (Liabilities)		(67)	(103)
Net Mark-to-Market Derivative Assets (Liabilities)		296	216
Net cash collateral received in connection with net derivative contracts		(34)	(55)
Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	[1]	218	223
Derivative Contracts, Noncurrent Assets	[1]	127	77
Total Mark-to-Market Derivative Assets	[1]	345	300
Derivative Contracts, Current Liabilities	[1]	(52)	(76)
Derivative Contracts, Noncurrent Liabilities	[1]	(14)	(16)
Total Mark-to-Market Derivative (Liabilities)	[1]	(66)	(92)
Net Mark-to-Market Derivative Assets (Liabilities)	[1]	279	208
Power [Member] | Netting [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	[1],[2]	(500)	(477)
Derivative Contracts, Noncurrent Assets	[1],[2]	(219)	(131)
Total Mark-to-Market Derivative Assets	[1],[2]	(719)	(608)
Derivative Contracts, Current Liabilities	[1],[2]	481	437
Derivative Contracts, Noncurrent Liabilities	[1],[2]	204	116
Total Mark-to-Market Derivative (Liabilities)	[1],[2]	685	553
Net Mark-to-Market Derivative Assets (Liabilities)	[1],[2]	(34)	(55)
PSE And G [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets		8	13
Derivative Contracts, Noncurrent Assets		2	0
Derivative Contracts, Noncurrent Liabilities		0	(11)
PSEG [Member] | Interest Rate Swap [Member] | Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	[1]	4	6
Derivative Contracts, Noncurrent Assets	[1]	4	0
Total Mark-to-Market Derivative Assets	[1]	8	6
Derivative Contracts, Current Liabilities	[1]	(1)	0
Derivative Contracts, Noncurrent Liabilities	[1]	0	0
Total Mark-to-Market Derivative (Liabilities)	[1]	(1)	0
Net Mark-to-Market Derivative Assets (Liabilities)	[1]	7	6
Not Designated as Hedging Instrument [Member] | Power [Member] | Energy-Related Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	[1]	718	700
Derivative Contracts, Noncurrent Assets	[1]	346	208
Total Mark-to-Market Derivative Assets	[1]	1,064	908
Derivative Contracts, Current Liabilities	[1]	(533)	(513)
Derivative Contracts, Noncurrent Liabilities	[1]	(218)	(132)
Total Mark-to-Market Derivative (Liabilities)	[1]	(751)	(645)
Net Mark-to-Market Derivative Assets (Liabilities)	[1]	313	263
Not Designated as Hedging Instrument [Member] | PSE And G [Member] | Energy-Related Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	[1]	8	13
Derivative Contracts, Noncurrent Assets	[1]	2	0
Total Mark-to-Market Derivative Assets	[1]	10	13
Derivative Contracts, Current Liabilities	[1]	0	0
Derivative Contracts, Noncurrent Liabilities	[1]	0	(11)
Total Mark-to-Market Derivative (Liabilities)	[1]	0	(11)
Net Mark-to-Market Derivative Assets (Liabilities)	[1]	10	2
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts		(37)	(53)
Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts		(16)	(16)
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts		$ 19	12
Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts			$ 2

[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 March 31, 2016 and December 31, 2015. 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 on the Condensed Consolidated Balance Sheets. As of March 31, 2016 and December 31, 2015, net cash collateral (received) paid of $(34) million and $(55) million, respectively, were netted against the corresponding net derivative contract positions. Of the $(34) million as of March 31, 2016, $(37) million and $(16) million of cash collateral were netted against current assets and noncurrent assets, respectively, and $19 million was netted against current liabilities. 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.