Financial Risk Management Activities (Narrative) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax		$ (5)	$ (6)
Unrealized Loss to be Reclassified to Earnings During the Next Twelve Months		(3)
Derivative, Fair Value, Amount Offset Against Collateral, Net	[1]	1,321	615
Derivative, Fair Value, Net		11	66
PSEG Power [Member]
Derivatives, Fair Value [Line Items]
Securities held as Collateral		11
Fair Value of Derivatives with credit-risk related contingent features		206	75
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral		28	29
Additional collateral aggregate fair value		$ 178	$ 46

[1] Represents the netting of fair value balances with the same counterparty (where the right of offset exists) and the application of collateral. All cash collateral (received) posted that has been allocated to derivative positions, where the right of offset exists, has been offset on the Condensed Consolidated Balance Sheets. As of March 31, 2022 and December 31, 2021, PSEG Power had net cash collateral (receipts) payments to counterparties of $1,527 million and $844 million, respectively. Of these net cash collateral (receipts) payments, $1,321 million and $615 million as of March 31, 2022 and December 31, 2021, respectively, were netted against the corresponding net derivative contract positions. Of the $1,321 million as of March 31, 2022, $(22) million was netted against current assets, $(15) million was netted against noncurrent assets, $830 million was netted against current liabilities and $528 million was netted against noncurrent liabilities. Of the $615 million as of December 31, 2021, $(30) million was netted against current assets, $(13) million was netted against noncurrent assets, $323 million was netted against current liabilities and $335 million was netted against noncurrent liabilities.