Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The net amount as of the balance sheet date of the fair value of derivative assets and derivative liabilities that in accordance with the entity's accounting policy were offset against collateral under a master netting arrangement.

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Financial Risk Management Activities (Narrative) (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($) Counterparty	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	$ 8		$ 24
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral	82		127
Additional collateral aggregate fair value	907		945
Power [Member]
Derivatives, Fair Value [Line Items]
Net exposure	314
Amount of after-tax gains on derivatives designated and effective as cash flow hedges expected to be reclassified to earnings during the 12 months following period end	$ 1
Credit exposure, percentage	99.30%
Number of active counterparties on credit risk derivatives \| Counterparty	138
Power [Member] \| Senior Notes 5.32% Due September 2016 [Member]
Derivatives, Fair Value [Line Items]
Senior Notes converted into variable rate debt	$ 303
PSEG [Member]
Derivatives, Fair Value [Line Items]
Aggregate amount of series of interest rate swaps converting to variable-rate debt	850
Fair value of interest rate swaps designated as underlying hedges	15		22
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral	18
Additional collateral aggregate fair value	64		109
Amount of reduction in interest expense attributed to interest rate swaps designated as fair value hedges	(5)	$ (10)
PSEG [Member] \| Senior Notes 5.5% Due December 2015 [Member]
Derivatives, Fair Value [Line Items]
Senior Notes converted into variable rate debt	$ 300
Stated interest rate of debt instrument	5.50%
PSEG [Member] \| Senior Notes 5.32% Due September 2016 [Member]
Derivatives, Fair Value [Line Items]
Senior Notes converted into variable rate debt	$ 300
Stated interest rate of debt instrument	5.32%
PSEG [Member] \| Senior Notes 2.75% Due September 2016 [Member]
Derivatives, Fair Value [Line Items]
Senior Notes converted into variable rate debt	$ 250
Stated interest rate of debt instrument	2.75%
Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	$ (4)		$ (8)
Investment Grade - External Rating [Member] \| Power [Member]
Derivatives, Fair Value [Line Items]
Net exposure	302
Investment Grade - External Rating [Member] \| PSE And G [Member]
Derivatives, Fair Value [Line Items]
Net exposure	82
Investment Grade - External Rating [Member] \| Nonaffiliated [Member]
Derivatives, Fair Value [Line Items]
Net exposure	$ 37