Financing Receivables (Outstanding Loans by Class of Customer) (Detail) - Public Service Electric and Gas Company [Member] - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Average Loan Repayment Period	8 years
Outstanding Loans by Class of Customer	$ 151	$ 164
Current Portion of Outstanding Loans	28	28
Noncurrent Portion of Outstanding Loans	$ 123	136
Average Loan Remaining Repayment Period	4 years
Commercial/Industrial [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	$ 144	156
Residential [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	7	$ 8
Solar Loan I [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	$ 22
Solar Loan I [Member] \| Commercial/Industrial [Member]
Concentration Risk [Line Items]
Loan Receivable, Term	15 years
Solar Loan I [Member] \| Residential [Member]
Concentration Risk [Line Items]
Loan Receivable, Term	10 years
Solar Loan II [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	$ 72
Solar Loan II [Member] \| Commercial/Industrial [Member]
Concentration Risk [Line Items]
Loan Receivable, Term	15 years
Solar Loan II [Member] \| Residential [Member]
Concentration Risk [Line Items]
Loan Receivable, Term	10 years
Solar Loan III [Member]
Concentration Risk [Line Items]
Outstanding Loans by Class of Customer	$ 57
Solar Loan III [Member] \| Commercial/Industrial [Member]
Concentration Risk [Line Items]
Loan Receivable, Term	10 years
Solar Loan III [Member] \| Residential [Member]
Concentration Risk [Line Items]
Loan Receivable, Term	10 years
Minimum [Member]
Concentration Risk [Line Items]
Loan Receivable, Term	10 years
Maximum [Member]
Concentration Risk [Line Items]
Loan Receivable, Term	15 years

Average Loan Remaining Repayment Period

No definition available.

Name:	pseg_AverageLoanRemainingRepaymentPeriod
Namespace Prefix:	pseg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Average Loan Repayment Period

+ References

No definition available.

+ Details

Name:	pseg_AverageLoanRepaymentPeriod
Namespace Prefix:	pseg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Loan Receivable, Term

+ References

No definition available.

+ Details

Name:	pseg_LoanReceivableTerm
Namespace Prefix:	pseg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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_ConcentrationRiskLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before allowance for credit loss, of financing receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4531-111522

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3(a),(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_NotesAndLoansReceivableGrossCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, before allowance for credit loss, of financing receivable, classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

+ Details

Name:	us-gaap_NotesAndLoansReceivableGrossNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, before allowance for credit loss, of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447

+ Details

Name:	us-gaap_NotesReceivableGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	dei_LegalEntityAxis=pseg_PublicServiceElectricandGasCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=pseg_CommercialIndustrialConcentrationCreditRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=pseg_ResidentialConcentrationCreditRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pseg_LoanProgramAxis=pseg_SolarLoanIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pseg_LoanProgramAxis=pseg_SolarLoanIIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pseg_LoanProgramAxis=pseg_SolarLoanIIIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: