Debt and Credit Facilities (Long-Term Debt Maturities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Repayments in Next Twelve Months	$ 1,684
Repayments in Year Two	744
Repayments in Year Three	1,775
Repayments in Year Four	1,500
Repayments in Year Five	900
Thereafter	9,690
Long-term Debt	16,293
Public Service Electric and Gas Company
Debt Instrument [Line Items]
Repayments in Next Twelve Months	434
Repayments in Year Two	0
Repayments in Year Three	825
Repayments in Year Four	750
Repayments in Year Five	350
Thereafter	8,640
Long-term Debt	10,999	$ 9,908
PSEG Power LLC
Debt Instrument [Line Items]
Repayments in Next Twelve Months	950
Repayments in Year Two	44
Repayments in Year Three	950
Repayments in Year Four	0
Repayments in Year Five	0
Thereafter	404
Long-term Debt	2,348	2,850
PSEG [Member]
Debt Instrument [Line Items]
Repayments in Next Twelve Months	300
Repayments in Year Two	700
Repayments in Year Three	0
Repayments in Year Four	750
Repayments in Year Five	550
Thereafter	646
Long-term Debt	$ 2,946	$ 2,450

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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