Financial Risk Management Activities (Schedule Of Derivative Instruments Fair Value In Balance Sheets) (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	$ 1	$ (55)
Derivative Contracts, Current Assets	163	242
Derivative Contracts, Noncurrent Assets	24	77
Total Mark-to-Market Derivative Assets	187	319
Derivative Contracts, Current Liabilities	(13)	(76)
Derivative Contracts, Noncurrent Liabilities	(3)	(27)
Total Mark-to-Market Derivative (Liabilities)	(16)	(103)
Net Mark-to-Market Derivative Assets (Liabilities)	171	216
Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	162	223	[1]
Derivative Contracts, Noncurrent Assets	24	77	[1]
Total Mark-to-Market Derivative Assets	186	300	[1]
Derivative Contracts, Current Liabilities	(8)	(76)	[1]
Derivative Contracts, Noncurrent Liabilities	(3)	(16)	[1]
Total Mark-to-Market Derivative (Liabilities)	(11)	(92)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	175	208	[1]
Power [Member] | Netting [Member]
Derivatives, Fair Value [Line Items]
Total Mark-to-Market Derivative Assets	(371)	(608)	[1],[2]
Total Mark-to-Market Derivative (Liabilities)	372	553	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	1	(55)	[1],[2]
PSE&G [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	0	13
Derivative Contracts, Current Liabilities	(5)	0
Derivative Contracts, Noncurrent Liabilities	0	(11)
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net		(53)
Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	(3)	(16)
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	4	12
Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net		2
Interest Rate Swaps [Member] | PSEG [Member] | Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	1	6	[1]
Derivative Contracts, Noncurrent Assets	0	0	[1]
Total Mark-to-Market Derivative Assets	1	6	[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)	1	6	[1]
Energy-Related Contracts [Member] | Not Designated as Hedging Instrument [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	435	700	[1]
Derivative Contracts, Noncurrent Assets	122	208	[1]
Total Mark-to-Market Derivative Assets	557	908	[1]
Derivative Contracts, Current Liabilities	(285)	(513)	[1]
Derivative Contracts, Noncurrent Liabilities	(98)	(132)	[1]
Total Mark-to-Market Derivative (Liabilities)	(383)	(645)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	174	263	[1]
Energy-Related Contracts [Member] | Not Designated as Hedging Instrument [Member] | PSE&G [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	0	13	[1]
Derivative Contracts, Noncurrent Assets	0	0	[1]
Total Mark-to-Market Derivative Assets	0	13	[1]
Derivative Contracts, Current Liabilities	(5)	0	[1]
Derivative Contracts, Noncurrent Liabilities	0	(11)	[1]
Total Mark-to-Market Derivative (Liabilities)	(5)	(11)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	(5)	2	[1]
Energy-Related Contracts [Member] | Current Assets [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	(273)	(477)	[1],[2]
Energy-Related Contracts [Member] | Non Current Assets [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	(98)	(131)	[1],[2]
Energy-Related Contracts [Member] | Current Liabilities [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	277	437	[1],[2]
Energy-Related Contracts [Member] | Noncurrent Liabilities [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	$ 95	$ 116	[1],[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 December 31, 2016 and 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 Consolidated Balance Sheets. As of December 31, 2016 and 2015, net cash collateral (received) paid of $1 million and $(55) million, respectively, were netted against the corresponding net derivative contract positions. Of the $1 million as of December 31, 2016, $(3) million was netted against noncurrent assets and $4 million was netted against current liabilities. Of the $(55) million as of December 31, 2015, cash collateral of $(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.