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Financial Risk Management Activities (Narrative) (Detail) $ / Derivative in Millions, $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 USD ($) $ / Derivative | Dec. 31, 2018 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax |  | $ (17) |  | $ (1)
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | (1) |  | 153
Derivative, Fair Value, Net |  | 8 |  | (3)
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 |  | 22 |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | (1) | [1],[2] | 153
Fair Value of Derivatives with credit-risk related contingent features |  | 35 |  | 22
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral |  | 6 |  | 7
Additional collateral aggregate fair value |  | 29 |  | 15
Derivative, Fair Value, Net |  | $ 15 | [2] | $ (3)
Interest Rate Swaps [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Interest Rate Hedge outstanding | $ / Derivative |  | 700 |  |
Interest Rate Swaps [Member] | PSEG [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Interest Rate Hedge outstanding | $ / Derivative |  | 700 |  |
Interest Rate Swaps [Member] | PSEG Power [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Interest Rate Hedge outstanding | $ / Derivative |  | 0 |  |
Interest Rate Swaps [Member] | Public Service Electric and Gas Company [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Interest Rate Hedge outstanding | $ / Derivative |  | 0 |  |
Term Loan maturing in 2020 [Member] | Interest Rate Swaps [Member] | PSEG [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Interest Rate Hedge outstanding | $ / Derivative |  | 700 |  |
Senior Notes Two Point Eight Seven Five Percent due Two Thousand Twenty Four [Member] | PSEG [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | $ 750 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.875% |  |
Fair Value Hedging [Member] | Interest Rate Swap [Member] | PSEG [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Fair Value, Net | [2] | $ (7) |  |
[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 or 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 September 30, 2019 and December 31, 2018, PSEG Power had net cash collateral/margin payments to counterparties of $92 million and $393 million, respectively. Of these net cash/collateral margin payments, $(1) million as of September 30, 2019 and $153 million as December 31, 2018 were netted against the corresponding net derivative contract positions. The $(1) million as of September 30, 2019 was netted against noncurrent assets. Of the $153 million as of December 31, 2018, $(2) million was netted against current assets, $(3) million was netted against noncurrent assets, $96 million was netted against current liabilities and $62 million was netted against noncurrent liabilities.
[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 September 30, 2019 and December 31, 2018.

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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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