Debt and Credit Facilities (Changes in Long-Term Debt) (Detail) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Debt Instrument [Line Items]
Issuance of Long-term Debt	$ 1,900	$ 2,050
Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt	1,150	1,350
PSEG Power [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt	0	$ 700
Senior Notes Two Point Eight Seven Five Percent due Two Thousand Twenty Four [Member] \| PSEG [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt	$ 750
Debt Instrument, Interest Rate, Stated Percentage	2.875%
Term Loan maturing in 2019 [Member] \| PSEG [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 350
Medium Term Notes Three Point Two Zero Percent due Two Thousand Twenty NIne [Member] \| Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt	$ 375
Debt Instrument, Interest Rate, Stated Percentage	3.20%
Medium Term Notes Three Point Two Zero Percent due Two Thousand Forty NIne [Member] \| Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt	$ 400
Debt Instrument, Interest Rate, Stated Percentage	3.20%
Medium Term Notes Three Point Eight Five Percent due Two Thousand Forty Nine [Member] \| Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Issuance of Long-term Debt	$ 375
Debt Instrument, Interest Rate, Stated Percentage	3.85%
Medium Term Notes One Point Eight Percent Due In Two Thousand Nineteen [Member] [Domain] \| Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.80%
Repayments of Long-term Debt	$ 250
Medium Term Notes Two Point Zero Percent due Two Thousand Nineteen [Member] \| Public Service Electric and Gas Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.00%
Repayments of Long-term Debt	$ 250
Pollution Control Notes Floating Rate Due On Two Thousand Twenty Two [Member] \| PSEG Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 44

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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