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Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax (Changes in AOCI) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ (489) $ (377) $ (229)
Other Comprehensive Income (Loss) before Reclassifications (11) (38) (9)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (4) 7 37
Net Current Period Other Comprehensive Income (Loss) (15) (31) 28
Ending Balance (504) (489) (377)
Net Change in Accumulated Other Comprehensive Income   (112) (148)
Cumulative Effect, Period of Adoption, Adjustment      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance   (81) (176)
Ending Balance     (81)
PSEG Power LLC      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (401) (319) (172)
Other Comprehensive Income (Loss) before Reclassifications (7) (17) (3)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (11) 4 31
Net Current Period Other Comprehensive Income (Loss) (18) (13) 28
Ending Balance (419) (401) (319)
Net Change in Accumulated Other Comprehensive Income   (82) (147)
PSEG Power LLC | Cumulative Effect, Period of Adoption, Adjustment      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance   (69) (175)
Ending Balance     (69)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (15) (1) 0
Other Comprehensive Income (Loss) before Reclassifications (4) (17) (1)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 10 3 0
Net Current Period Other Comprehensive Income (Loss) 6 (14) (1)
Ending Balance (9) (15) (1)
Net Change in Accumulated Other Comprehensive Income   (14) (1)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Cumulative Effect, Period of Adoption, Adjustment      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance   0 0
Ending Balance     0
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | PSEG Power LLC      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 0 0 0
Other Comprehensive Income (Loss) before Reclassifications 0 0 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 0 0 0
Net Current Period Other Comprehensive Income (Loss) 0 0 0
Ending Balance 0 0 0
Net Change in Accumulated Other Comprehensive Income   0 0
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | PSEG Power LLC | Cumulative Effect, Period of Adoption, Adjustment      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance   0 0
Ending Balance     0
Accumulated Defined Benefit Plans Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (499) (360) (406)
Other Comprehensive Income (Loss) before Reclassifications (58) (70) 17
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 12 12 29
Net Current Period Other Comprehensive Income (Loss) (46) (58) 46
Ending Balance (545) (499) (360)
Net Change in Accumulated Other Comprehensive Income   (139) 46
Accumulated Defined Benefit Plans Adjustment [Member] | Cumulative Effect, Period of Adoption, Adjustment      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance   (81) 0
Ending Balance     (81)
Accumulated Defined Benefit Plans Adjustment [Member] | PSEG Power LLC      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (420) (306) (347)
Other Comprehensive Income (Loss) before Reclassifications (48) (55) 16
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 9 10 25
Net Current Period Other Comprehensive Income (Loss) (39) (45) 41
Ending Balance (459) (420) (306)
Net Change in Accumulated Other Comprehensive Income   (114) 41
Accumulated Defined Benefit Plans Adjustment [Member] | PSEG Power LLC | Cumulative Effect, Period of Adoption, Adjustment      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance   (69) 0
Ending Balance     (69)
Accumulated Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 25 (16) 177
Other Comprehensive Income (Loss) before Reclassifications 51 49 (25)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (26) (8) 8
Net Current Period Other Comprehensive Income (Loss) 25 41 (17)
Ending Balance 50 25 (16)
Net Change in Accumulated Other Comprehensive Income   41 (193)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Cumulative Effect, Period of Adoption, Adjustment      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance   0 (176)
Ending Balance     0
Accumulated Net Unrealized Investment Gain (Loss) [Member] | PSEG Power LLC      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 19 (13) 175
Other Comprehensive Income (Loss) before Reclassifications 41 38 (19)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (20) (6) 6
Net Current Period Other Comprehensive Income (Loss) 21 32 (13)
Ending Balance $ 40 19 (13)
Net Change in Accumulated Other Comprehensive Income   32 (188)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | PSEG Power LLC | Cumulative Effect, Period of Adoption, Adjustment      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance   $ 0 (175)
Ending Balance     $ 0