Debt and Credit Facilities (Long-Term Debt Maturities) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Repayments in Next Twelve Months	$ 1,294
Repayments in Year Two	1,365
Repayments in Year Three	1,684
Repayments in Year Four	700
Repayments in Year Five	1,775
Thereafter	7,740
Long-term Debt	14,558
PSE&G
Debt Instrument [Line Items]
Repayments in Next Twelve Months	500
Repayments in Year Two	259
Repayments in Year Three	434
Repayments in Year Four	0
Repayments in Year Five	825
Thereafter	7,240
Long-term Debt	9,258	$ 8,658
Power [Member]
Debt Instrument [Line Items]
Repayments in Next Twelve Months	44
Repayments in Year Two	406
Repayments in Year Three	950
Repayments in Year Four	0
Repayments in Year Five	950
Thereafter	500
Long-term Debt	2,850	2,400
PSEG [Member]
Debt Instrument [Line Items]
Repayments in Next Twelve Months	750
Repayments in Year Two	700
Repayments in Year Three	300
Repayments in Year Four	700
Repayments in Year Five	0
Thereafter	0
Long-term Debt	$ 2,450	$ 2,100

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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