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Financial Risk Management Activities (Narrative) (Detail) $ / Derivative in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) $ / Derivative | Dec. 31, 2019 USD ($) $ / Derivative
Derivatives, Fair Value [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax |  | $ (18) |  | $ (15)
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | (13) |  | (2)
Derivative, Fair Value, Net |  | 195 |  | 100
Unrealized Loss to be Reclassified to Earnings During the Next Twelve Months |  | (2) |  |
PSEG Power [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Securities held as Collateral |  | 93 |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | (13) | [1],[2] | (2)
Fair Value of Derivatives with credit-risk related contingent features |  | 37 |  | 35
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral |  | 4 |  | 2
Additional collateral aggregate fair value |  | 33 |  |
Derivative, Fair Value, Net |  | $ 205 | [2] | $ 105
Interest Rate Swaps [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Interest Rate Hedge outstanding | $ / Derivative |  | 700 |  | 700
Interest Rate Swaps [Member] | PSEG [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Interest Rate Hedge outstanding | $ / Derivative |  | 700 |  | 700
Interest Rate Swaps [Member] | PSEG Power [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Interest Rate Hedge outstanding | $ / Derivative |  | 0 |  | 0
Interest Rate Swaps [Member] | Public Service Electric and Gas Company [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Interest Rate Hedge outstanding | $ / Derivative |  | 0 |  | 0
Term Loan maturing in 2020 [Member] | Interest Rate Swap [Member] | PSEG [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Interest Rate Hedge outstanding | $ / Derivative |  | 700 |  |
Fair Value Hedging [Member] | Interest Rate Swap [Member] | PSEG [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Fair Value, Net | [2] | $ (10) |  | $ (5)
[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, 2020 and December 31, 2019, PSEG Power had net cash collateral (receipts) payments to counterparties of $(11) million and $44 million, respectively. Of these net cash collateral (receipts) payments, $(13) million as of March 31, 2020 and $(2) million as of December 31, 2019 were netted against the corresponding net derivative contract positions. Of the $(13) million as of March 31, 2020, $(7) million was netted against current assets and $(6) million was netted against noncurrent assets. Of the $(2) million as of December 31, 2019, $(1) million was netted against current assets and $(1) million was netted against noncurrent assets
[2] | Substantially all of PSEG Power’s and PSEG’s derivative instruments are contracts subject to master netting agreements. Contracts not subject to master netting or similar agreements are immaterial and did not have any collateral posted or received as of March 31, 2020 and December 31, 2019.

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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