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Trust Investments (Tables)
 12 Months Ended
Dec. 31, 2020
Nuclear Decommissioning Trust (NDT) Fund [Member]  
Schedule of Trust Investments [Line Items]  
Schedule of Available-for-sale Securities Reconciliation
The following tables show the fair values and gross unrealized gains and losses for the securities held in the NDT Fund.
 As of December 31, 2020
 CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
 Millions
Equity Securities
Domestic$519 $305 $(3)$821 
International388 152 (9)531 
Total Equity Securities907 457 (12)1,352 
Available-for-Sale Debt Securities
Government 555 27 (1)581 
Corporate528 39 (1)566 
Total Available-for-Sale Debt Securities1,083 66 (2)1,147 
Total NDT Fund Investments (A)$1,990 $523 $(14)$2,499 
    (A)    The NDT Fund Investments table excludes foreign currency of $2 million as of December 31, 2020,
        which is part of the NDT Fund.
 As of December 31, 2019
 CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Millions
Equity Securities
Domestic$425 $238 $(4)$659 
International400 103 (11)492 
Total Equity Securities825 341 (15)1,151 
Available-for-Sale Debt Securities
Government 563 16 (2)577 
Corporate470 17 (1)486 
Total Available-for-Sale Debt Securities1,033 33 (3)1,063 
Total NDT Fund Investments (A)$1,858 $374 $(18)$2,214 
Schedule Of Accounts Receivable And Accounts Payable The amounts in the preceding tables do not include receivables and payables for NDT Fund transactions which have not settled at the end of each period. Such amounts are included in Accounts Receivable and Accounts Payable on the Consolidated Balance Sheets as shown in the following table.
As of December 31,
20202019
 Millions
Accounts Receivable$11 $11 
Accounts Payable$12 $11 
Value Of Securities That Have Been In An Unrealized Loss Position For Less Than And Greater Than 12 Months
The following table shows the value of securities in the NDT Fund that have been in an unrealized loss position for less than and greater than 12 months.
 As of December 31, 2020As of December 31, 2019
 Less Than 12
Months		Greater Than 12
Months		Less Than 12
Months		Greater Than 12
Months
 Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
Millions
Equity Securities (A)
Domestic $23 $(2)$6 $(1)$21 $(1)$6 $(3)
International26 (2)27 (7)28 (2)34 (9)
Total Equity Securities49 (4)33 (8)49 (3)40 (12)
Available-for-Sale Debt Securities
Government (B)72 (1)— — 99 (2)30 — 
Corporate (C)31 (1)7 — 49 — 12 (1)
Total Available-for-Sale Debt Securities103 (2)7 — 148 (2)42 (1)
NDT Trust Investments$152 $(6)$40 $(8)$197 $(5)$82 $(13)
(A)Equity Securities—Investments in marketable equity securities within the NDT Fund are primarily in common stocks within a broad range of industries and sectors. Unrealized gains and losses on these securities are recorded in Net Income.
(B)Debt Securities (Government)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). The unrealized losses on PSEG Power’s NDT investments in U.S. Treasury obligations and Federal Agency mortgage-backed securities were caused by interest rate changes. PSEG Power also has investments in municipal bonds. It is not expected that these securities will settle for less than their amortized cost. PSEG Power does not intend to sell these securities nor will it be more-likely-than-not required to sell before recovery of their amortized cost. PSEG Power did not recognize credit losses for U.S. Treasury obligations and Federal Agency mortgage-backed securities because these investments are guaranteed by the U.S. government or an agency of the U.S. government. PSEG Power did not recognize credit losses for municipal bonds because they are primarily investment grade securities.
(C)Debt Securities (Corporate)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). Unrealized losses were due to market declines. It is not expected that these securities would settle for less than their amortized cost. PSEG Power does not intend to sell these securities nor will it be more-likely-than-not required to sell before recovery of their amortized cost. PSEG Power did not recognize credit losses for these corporate bonds because they are primarily investment grade securities.
Amount Of Available-For-Sale Debt Securities By Maturity Periods
The NDT Fund debt securities held as of December 31, 2020 had the following maturities:
Time FrameFair Value
 Millions
Less than one year$20 
1 - 5 years301 
6 - 10 years202 
11 - 15 years81 
16 - 20 years79 
Over 20 years464 
Total NDT Available-for-Sale Debt Securities$1,147 
 
Schedule of Realized Gain (Loss)
The proceeds from the sales of and the net gains (losses) on securities in the NDT Fund were:
 Years Ended December 31,
 202020192018
 Millions
Proceeds from Sales (A)$2,031 $1,614 $1,398 
Net Realized Gains (Losses):
Gross Realized Gains$214 $107 $121 
Gross Realized Losses(94)(53)(51)
Net Realized Gains (Losses) on NDT Fund (B)120 54 70 
Unrealized Gains (Losses) on Equity Securities in NDT Fund 120 196 (209)
Impairment of Available-for-Sale Debt Securities (C)(3)— — 
Net Gains (Losses) on NDT Fund Investments $237 $250 $(139)
(A)Includes activity in accounts related to the liquidation of funds being transitioned to new managers.
(B)The cost of these securities was determined on the basis of specific identification.
(C)PSEG Power recognized an impairment of available-for-sale debt securities that it intends to sell. PSEG Power’s policy is to sell all such securities that are rated below investment grade.
Rabbi Trust [Member]  
Schedule of Trust Investments [Line Items]  
Schedule of Available-for-sale Securities Reconciliation
 As of December 31, 2020
 CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
 Millions
Equity Securities
Domestic$21 $10 $— $31 
International— — — — 
Total Equity Securities21 10 — 31 
Available-for-Sale Debt Securities
  Government 94 6 — 100 
  Corporate123 12 — 135 
Total Available-for-Sale Debt Securities217 18 — 235 
Total Rabbi Trust Investments$238 $28 $— $266 
 As of December 31, 2019
 CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Millions
Equity Securities
Domestic$21 $7 $— $28 
International— — — — 
Total Equity Securities21 7 — 28 
Available-for-Sale Debt Securities
  Government 100 4 — 104 
  Corporate107 7 — 114 
Total Available-for-Sale Debt Securities207 11 — 218 
Total Rabbi Trust Investments$228 $18 $— $246 
Schedule Of Accounts Receivable And Accounts Payable
The amounts in the preceding tables do not include receivables and payables for Rabbi Trust Fund transactions which have not settled at the end of each period. Such amounts are included in Accounts Receivable and Accounts Payable on the Consolidated Balance Sheets as shown in the following table.
As of December 31,
20202019
 Millions
Accounts Receivable$1 $2 
Accounts Payable$1 $— 
Value Of Securities That Have Been In An Unrealized Loss Position For Less Than And Greater Than 12 Months
The following table shows the value of securities in the Rabbi Trust Fund that have been in an unrealized loss position for less than and greater than 12 months:
 As of December 31, 2020As of December 31, 2019
 Less Than 12
Months		Greater Than 12
Months		Less Than 12
Months		Greater Than 12
Months
 Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
Millions
Available-for-Sale Debt Securities
Government (A)$19 $— $— $— $26 $— $3 $— 
Corporate (B)2 — 1 — 11 — 2 — 
Total Available-for-Sale Debt Securities21 — 1 — 37 — 5 — 
Rabbi Trust Investments$21 $— $1 $— $37 $— $5 $— 
(A)Debt Securities (Government)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). The unrealized losses on PSEG’s Rabbi Trust investments in U.S. Treasury obligations and Federal Agency mortgage-backed securities were caused by interest rate changes. PSEG also has investments in municipal bonds. It is not expected that these securities will settle for less than their amortized cost. PSEG does not intend to sell these securities nor will it be more-likely-than-not required to sell before recovery of their amortized cost. PSEG did not recognize credit losses for U.S. Treasury obligations and Federal Agency mortgage-backed securities because these investments are guaranteed by the U.S. government or an agency of the U.S. government. PSEG did not recognize credit losses for municipal bonds because they are primarily investment grade securities.
(B)Debt Securities (Corporate)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). Unrealized losses were due to market declines. It is not expected that these securities would settle for less than their amortized cost. PSEG does not intend to sell these securities nor will it be more-likely-than-not required to sell before recovery of their amortized cost. PSEG did not recognize credit losses for these corporate bonds because they are primarily investment grade.
Amount Of Available-For-Sale Debt Securities By Maturity Periods
The Rabbi Trust debt securities held as of December 31, 2020 had the following maturities:
Time FrameFair Value
 Millions
Less than one year$5 
1 - 5 years39 
6 - 10 years30 
11 - 15 years12 
16 - 20 years30 
Over 20 years119 
Total Rabbi Trust Available-for-Sale Debt Securities$235 
 
Schedule of Realized Gain (Loss)
The proceeds from the sales of and the net gains (losses) on securities in the Rabbi Trust Fund were:
 Years Ended December 31,
 202020192018
 Millions
Proceeds from Rabbi Trust Sales (A)$203 $173 $103 
Net Realized Gains (Losses):
Gross Realized Gains $19 $7 $2 
Gross Realized Losses (6)(3)(4)
Net Realized Gains (Losses) on Rabbi Trust (B)13 4 (2)
Unrealized Gains (Losses) on Equity Securities in Rabbi Trust 3 6 (2)
Net Gains (Losses) on Rabbi Trust Investments $16 $10 $(4)
(A)Includes activity in accounts related to the liquidation of funds being transitioned to new managers.
(B)The cost of these securities was determined on the basis of specific identification.
Rabbi Trust Fair Value by Company The fair value of the Rabbi Trust related to PSEG, PSE&G and PSEG Power are detailed as follows:
As of December 31,As of December 31,
20202019
 Millions
PSE&G$51 $48 
PSEG Power66 62 
Other149 136 
Total Rabbi Trust Investments$266 $246