Leases Leases (Details) $ in Millions	9 Months Ended
Sep. 30, 2019 USD ($) renewals
Lessee, Lease, Description [Line Items]
Lessor leases carrying value	$ 261
Public Service Electric and Gas Company [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability, Current	$ 12
Public Service Electric and Gas Company [Member] \| Maximum
Lessee, Lease, Description [Line Items]
Lease renewal term	5 years
PSEG Power [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability, Current	$ 10
Lease renewal term	5 years
Number of lease renewal terms \| renewals	7
Lessor leases carrying value	$ 333
PSEG Power [Member] \| Minimum [Member]
Lessee, Lease, Description [Line Items]
Lease renewal term	15 years
PSEG Power [Member] \| Maximum
Lessee, Lease, Description [Line Items]
Lease renewal term	20 years
PSEG
Lessee, Lease, Description [Line Items]
Operating Lease, Liability, Current	$ 33
Services \| Subsidiaries
Lessee, Lease, Description [Line Items]
Lease renewal term	5 years
Number of lease renewal terms \| renewals	2
Energy Holdings \| Subsidiaries
Lessee, Lease, Description [Line Items]
Lease renewal term	5 years
Number of lease renewal terms \| renewals	8
Lessor leases carrying value	$ 24

Lessee, Operating Lease, Number Of Renewal Periods

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- 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

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- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

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- Definition

Amount of lease payments to be received by lessor for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919396-209981

+ Details

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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