Financial Risk Management Activities (Schedule Of Derivative Instruments Fair Value In Balance Sheets) (Detail) - USD ($) $ in Millions		Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets		$ 114	$ 163
Derivative Contracts, Noncurrent Assets		93	24
Total Mark-to-Market Derivative Assets		207	187
Derivative Contracts, Current Liabilities		(7)	(13)
Derivative Contracts, Noncurrent Liabilities		(1)	(3)
Total Mark-to-Market Derivative (Liabilities)		(8)	(16)
Net Mark-to-Market Derivative Assets (Liabilities)		199	171
Net cash collateral received in connection with net derivative contracts			1
Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	[1]	111	162
Derivative Contracts, Noncurrent Assets	[1]	93	24
Total Mark-to-Market Derivative Assets	[1]	204	186
Derivative Contracts, Current Liabilities	[1]	(7)	(8)
Derivative Contracts, Noncurrent Liabilities	[1]	(1)	(3)
Total Mark-to-Market Derivative (Liabilities)	[1]	(8)	(11)
Net Mark-to-Market Derivative Assets (Liabilities)	[1]	196	175
Net cash collateral received in connection with net derivative contracts	[1],[2]	0	1
PSE And G [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets		1	0
Derivative Contracts, Current Liabilities		0	(5)
Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts		(4)	(3)
Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts		(4)	(3)
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts		4	4
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts		4	4
Energy-Related Contracts [Member] | Not Designated as Hedging Instrument [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	[1]	525	435
Derivative Contracts, Noncurrent Assets	[1]	264	122
Total Mark-to-Market Derivative Assets	[1]	789	557
Derivative Contracts, Current Liabilities	[1]	(425)	(285)
Derivative Contracts, Noncurrent Liabilities	[1]	(168)	(98)
Total Mark-to-Market Derivative (Liabilities)	[1]	(593)	(383)
Net Mark-to-Market Derivative Assets (Liabilities)	[1]	196	174
Energy-Related Contracts [Member] | Not Designated as Hedging Instrument [Member] | PSE And G [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	[1]	1	0
Derivative Contracts, Noncurrent Assets	[1]	0	0
Total Mark-to-Market Derivative Assets	[1]	1	0
Derivative Contracts, Current Liabilities	[1]	0	(5)
Derivative Contracts, Noncurrent Liabilities	[1]	0	0
Total Mark-to-Market Derivative (Liabilities)	[1]	0	(5)
Net Mark-to-Market Derivative Assets (Liabilities)	[1]	1	(5)
Energy-Related Contracts [Member] | Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	[3]	(585)	(371)
Energy-Related Contracts [Member] | Assets [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	[1],[2],[3]	(585)	(371)
Energy-Related Contracts [Member] | Assets [Member] | PSE And G [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	[3]	0	0
Energy-Related Contracts [Member] | Current Assets [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	[1],[2]	(414)	(273)
Energy-Related Contracts [Member] | Non Current Assets [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	[1],[2]	(171)	(98)
Energy-Related Contracts [Member] | Current Liabilities [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	[1],[2]	418	277
Energy-Related Contracts [Member] | Noncurrent Liabilities [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	[1],[2]	167	95
Energy-Related Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	[3]	585	372
Energy-Related Contracts [Member] | Other Liabilities [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	[1],[2],[3]	585	372
Energy-Related Contracts [Member] | Other Liabilities [Member] | PSE And G [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	[3]	0	0
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	[3]		0
Interest Rate Swap [Member] | PSEG [Member] | Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	[1]	2	1
Derivative Contracts, Noncurrent Assets	[1]	0	0
Total Mark-to-Market Derivative Assets	[1]	2	1
Derivative Contracts, Current Liabilities	[1]	0	0
Derivative Contracts, Noncurrent Liabilities	[1]	0	0
Total Mark-to-Market Derivative (Liabilities)	[1]	0	0
Net Mark-to-Market Derivative Assets (Liabilities)	[1]	2	$ 1
Interest Rate Swap [Member] | Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	[3]	0
Interest Rate Swap [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	[3]	$ 0

[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, 2017 and December 31, 2016. 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, 2017 net cash collateral (received) paid was netted against the corresponding net derivative contract positions with $(4) million of cash collateral netted against noncurrent assets, and $4 million netted against current liabilities. As of December 31, 2016, net cash collateral (received) paid of $1 million was 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.

[3] 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 Condensed Consolidated Balance Sheets. As of March 31, 2017, $(4) million of cash collateral was netted against assets, and $4 million was netted against liabilities. As of December 31, 2016, net cash collateral (received) paid of $1 million was netted against the corresponding net derivative contract positions. Of the $1 million of cash collateral as of December 31, 2016, $(3) million was netted against assets, and $4 million was netted against liabilities.