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Financial Risk Management Activities (Schedule Of Net Notional Volume For Open Derivative Contracts) (Detail) $ / mwh in Millions, $ / DTH in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2021 $ / DTH $ / mwh	Jun. 30, 2020 $ / DTH $ / mwh
Natural Gas Dth [Member]
Derivative [Line Items]
Net notional volume of derivative transactions | $ / DTH	308	321
Electricity MWh [Member]
Derivative [Line Items]
Net notional volume of derivative transactions	(66)	(66)
FTRs MWh [Member]
Derivative [Line Items]
Net notional volume of derivative transactions	11	20
PSEG [Member] | Natural Gas Dth [Member]
Derivative [Line Items]
Net notional volume of derivative transactions	0	0
PSEG [Member] | Electricity MWh [Member]
Derivative [Line Items]
Net notional volume of derivative transactions	0	0
PSEG [Member] | FTRs MWh [Member]
Derivative [Line Items]
Net notional volume of derivative transactions	0	0
PSEG Power [Member] | Natural Gas Dth [Member]
Derivative [Line Items]
Net notional volume of derivative transactions | $ / DTH	308	321
PSEG Power [Member] | Electricity MWh [Member]
Derivative [Line Items]
Net notional volume of derivative transactions	(66)	(66)
PSEG Power [Member] | FTRs MWh [Member]
Derivative [Line Items]
Net notional volume of derivative transactions	11	20
Public Service Electric and Gas Company [Member] | Natural Gas Dth [Member]
Derivative [Line Items]
Net notional volume of derivative transactions | $ / DTH	0	0
Public Service Electric and Gas Company [Member] | Electricity MWh [Member]
Derivative [Line Items]
Net notional volume of derivative transactions	0	0
Public Service Electric and Gas Company [Member] | FTRs MWh [Member]
Derivative [Line Items]
Net notional volume of derivative transactions	0	0

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract but not the derivative contract itself.

+ References

No definition available.

+ Details

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- Definition

Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract measured in volume but not the derivative contract itself.

+ References

No definition available.

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