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

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Commodity Cash Flow Hedge Gain Loss to be Reclassified During Next 12 Months Net

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Net credit exposure with counterparties after applying collateral

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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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-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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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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Fair value, after effects of master netting arrangements, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective.

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Fair value as of the balance sheet date of all derivative assets designated as interest rate fair value hedging instruments.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Financial Risk Management Activities (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	$ 24	$ 2
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral	127	91
Additional collateral aggregate fair value	945	691
PSEG [Member]
Derivatives, Fair Value [Line Items]
Senior Notes converted into variable rate debt	303
Aggregate amount of series of interest rate swaps converting to variable-rate debt	850
Fair value of interest rate swaps designated as underlying hedges	22	38
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral	18	39
Additional collateral aggregate fair value	109	52
Amount of reduction in interest expense attributed to interest rate swaps designated as fair value hedges	20	19	22
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]
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%
Power [Member]
Derivatives, Fair Value [Line Items]
Net Credit Exposure With Counterparties After Applying Collateral	432
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	10
Power [Member] \| Senior Notes 5.32% Due September 2016 [Member]
Derivatives, Fair Value [Line Items]
Senior Notes converted into variable rate debt	300
Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	(8)	(3)
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	32	5
Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	4
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	$ (4)