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Debt and Credit Facilities (Changes in Long-Term Debt) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Debt Instrument [Line Items]
Issuance of Long-term Debt	$ 900	$ 600
Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt	900	$ 600
Medium Term Notes Zero Point Nine Five due Two Thousand Twenty Six | Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt	$ 450
Debt Instrument, Interest Rate, Stated Percentage	0.95%
Medium Term Notes Three Point Zero due Two Thousand Fifty One | Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt	$ 450
Debt Instrument, Interest Rate, Stated Percentage	3.00%
Medium Term Notes One Point Nine Zero Percent Due In Two Thousand Twenty One | Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.90%
Repayments of Long-term Debt	$ 300

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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+ References

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Amount of cash inflow from issuance of long-term debt classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

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+ References

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-Topic 230
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-Section 45
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