XML 106 R85.htm IDEA: XBRL DOCUMENT
v3.21.1

Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net assets measured at fair value on a recurring basis |  | $ 3,400 | $ 2,700 |
Net Derivative Assets [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs |  | (1) |  |
Net Derivative Assets [Member] | PSEG Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Issuances (Settlements) | [1] | (4) | (1) |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs |  |  | $ 19 |
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
NDT Fund Foreign Currency |  | $ 1 |  | $ 2
[1] | 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.

X
- Definition Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs, Issuances (Settlements) + References No definition available. + Details
Name: | pseg_FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasiswithUnobservableInputsIssuancesSettlements
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition NDT Fund Foreign Currency + References No definition available. + Details
Name: | pseg_NDTFundForeignCurrency
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net Assets Measured At Fair Value On A Recurring Basis + References No definition available. + Details
Name: | pseg_NetAssetsMeasuredAtFairValueOnRecurringBasis
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + Details
Name: | us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=pseg_NetDerivativeAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=pseg_PSEGPowerLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pseg_TrustSecuritiesTypeOfTrustAxis=pseg_NuclearDecommissioningTrustNdtFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |