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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Financial Risk Management Activities (Narrative) (Detail) $ / Derivative in Millions, $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) $ / Derivative	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Oct. 31, 2023 USD ($)
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	$ 49		$ 49	$ (124)
Credit Risk Derivative Liabilities, at Fair Value	77		77	190
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral	3		3	41
Additional collateral aggregate fair value	74		74	149
Proceeds from Short-term Debt			750	2,000	$ 2,500
Long-term Debt	19,411		19,411
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	3		3	(3)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			3
PSEG [Member]
Derivatives, Fair Value [Line Items]
Long-term Debt	4,396		4,396	4,146
PSEG Power LLC [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	60		60	(125)
Long-term Debt	1,250		1,250	1,250
Senior Notes Three Point Eight Five Percent due Two Thousand Twenty Three [Member] \| PSEG Power LLC [Member]
Derivatives, Fair Value [Line Items]
Long-term Debt	1,250		1,250	1,250
Senior Notes Five Point Eight Five Percent Due In Two Thousand Twenty Seven \| PSEG [Member]
Derivatives, Fair Value [Line Items]
Long-term Debt	700		700	700
Three Year Variable rate term loan \| PSEG Power LLC [Member]
Derivatives, Fair Value [Line Items]
Long-term Debt	1,250		$ 1,250
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Underlying, Derivative \| $ / Derivative			1,400
Interest Rate Swaps [Member] \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	$ 5		$ 5	$ 1
Interest Rate Swaps [Member] \| Three Year Variable rate term loan \| PSEG Power LLC [Member]
Derivatives, Fair Value [Line Items]
Underlying, Derivative \| $ / Derivative			900
Interest Rate Swaps [Member] \| Parent Variable Rate Term Loan
Derivatives, Fair Value [Line Items]
Underlying, Derivative \| $ / Derivative			500
Treasury Lock
Derivatives, Fair Value [Line Items]
Underlying, Derivative	600	800
Derivative, Fair Value, Net	$ (16)		$ (16)			$ 17