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Fair Value Measurements (Changes In Level 3 Assets And (Liabilities) Measured At Fair Value On A Recurring Basis) (Detail) - USD ($)
$ in Millions

3 Months Ended

Mar. 31, 2021

Mar. 31, 2020

Dec. 31, 2020

Dec. 31, 2019

PSEG Power [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Included in Income

$ (4)

$ 13

Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)

(8)

12

Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements

(4)

(1)

Net Derivative Assets (Liabilities) [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Closing Balance

(1)

Net Derivative Assets (Liabilities) [Member] | PSEG Power [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value

$ 7

$ 7

Included in Income

^[1]

(4)

13

Purchases, (Sales)

0

0

Issuances (Settlements)

^[2]

(4)

(1)

Transfers In (Out)

^[3]

0

0

Closing Balance

19

Operating Revenues [Member] | PSEG Power [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Included in Income

(5)

18

Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)

(9)

11

Energy Costs [Member] | PSEG Power [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Included in Income

1

(5)

Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)

$ 1

$ 1

[1]

Unrealized gains (losses) in the following table represent the change in derivative assets and liabilities still held as of March 31, 2021 and 2020.

															Three Months Ended March 31,
																					2021												2020
																																	Total Gains (Losses)						Unrealized Gains (Losses)						Total Gains (Losses)						Unrealized Gains (Losses)
																																	Millions
			PSEG and PSEG Power
			Operating Revenues																														$	(5)					$	(9)					$	18					$	11
			Energy Costs																														1						1						(5)						1
			Total																														$	(4)					$	(8)					$	13					$	12

[2]

Includes settlements of $(4) million for the three months ended March 31, 2021 and $(1) million for the three months ended March 31, 2020, respectively.

[3]

There were no transfers into or out of Level 3 during the three months and three months ended March 31, 2021 and 2020.

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Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into (out of) level 3 of the fair value hierarchy.

+ References

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