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

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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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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Fair value of all asset derivatives designated as cash flow hedging instruments.

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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) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) Counterparty	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	$ (34)		$ (55)
Aggregate amount of series of interest rate swaps converting to variable-rate debt	900
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral	62		78
Additional collateral aggregate fair value	851		864
Cash Flow Hedge Derivative Instrument Assets at Fair Value	3
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	2
Power [Member]
Derivatives, Fair Value [Line Items]
Net exposure	$ 351
Number of active counterparties on credit risk derivatives \| Counterparty	137
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	550
Fair value of interest rate swaps designated as underlying hedges	4		6
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral	16		12
Additional collateral aggregate fair value	46		66
Amount of reduction in interest expense attributed to interest rate swaps designated as fair value hedges	(2)	$ (5)
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	$ (16)		$ (16)
Investment Grade - External Rating [Member] \| Power [Member]
Derivatives, Fair Value [Line Items]
Net exposure	$ 312
Credit exposure, percentage	91.00%