Debt and Credit Facilities (Long-Term Debt Maturities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Repayments in Next Twelve Months	$ 1,365
Repayments in Year Two	1,684
Repayments in Year Three	744
Repayments in Year Four	1,775
Repayments in Year Five	1,500
Thereafter	8,140
Long-term Debt	15,208
Public Service Electric and Gas Company
Debt Instrument [Line Items]
Repayments in Next Twelve Months	259
Repayments in Year Two	434
Repayments in Year Three	0
Repayments in Year Four	825
Repayments in Year Five	750
Thereafter	7,640
Long-term Debt	9,908	$ 9,258
PSEG Power LLC
Debt Instrument [Line Items]
Repayments in Next Twelve Months	406
Repayments in Year Two	950
Repayments in Year Three	44
Repayments in Year Four	950
Repayments in Year Five	0
Thereafter	500
Long-term Debt	2,850	2,850
PSEG [Member]
Debt Instrument [Line Items]
Repayments in Next Twelve Months	700
Repayments in Year Two	300
Repayments in Year Three	700
Repayments in Year Four	0
Repayments in Year Five	750
Thereafter	0
Long-term Debt	$ 2,450	$ 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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