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Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications out of AOCI) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from Accumulated Other Comprehensive Income, Pre-Tax | $ 12 | $ (8) | $ (54)
Amount Reclassified from Accumulated Other Comprehensive Income, Tax | (8) | 1 | 17
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | 4 | (7) | (37)
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax | 42 | 13 | (13)
Amount Reclassified from AOCI for Available for Sale Securities, Tax | (16) | (5) | 5
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | 26 | 8 | (8)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | 26 | 8 | (8)
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from AOCI for Pension and OPEB Plans, Pre-Tax | (16) | (17) | (41)
Amount Reclassified from AOCI for Pension and OPEB Plans, Tax | 4 | 5 | 12
Amount Reclassified from AOCI for Pension and OPEB Plans, After-Tax | (12) | (12) | (29)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | (12) | (12) | (29)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from AOCI for Cash Flow Hedges, Pre-Tax | (14) | (4) |
Amount Reclassified from AOCI for Cash Flow Hedges, Tax | 4 | 1 |
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax | (10) | (3) |
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | (10) | (3) | 0
Net Gains (Losses) on Trust Investments [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax | 42 | 13 | (13)
Amount Reclassified from AOCI for Available for Sale Securities, Tax | (16) | (5) | 5
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | 26 | 8 | (8)
Interest Expense [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from AOCI for Cash Flow Hedges, Pre-Tax | (14) | (4) |
Amount Reclassified from AOCI for Cash Flow Hedges, Tax | 4 | 1 |
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax | (10) | (3) |
Non-Operating Pension and OPEB Credits (Costs) [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amortization of Prior Service (Cost) Credit, Pre-Tax | 24 | 26 | 6
Amortization of Prior Service (Cost) Credit, Tax | (7) | (7) | (2)
Amortization of Prior Service (Cost) Credit, After-Tax | 17 | 19 | 4
Amortization of Actuarial Loss, Pre-Tax | (40) | (43) | (47)
Amortization of Actuarial Loss, Tax | 11 | 12 | 14
Amortization of Actuarial Loss, After-Tax | (29) | (31) | (33)
PSEG Power LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from Accumulated Other Comprehensive Income, Pre-Tax | 21 | (3) | (46)
Amount Reclassified from Accumulated Other Comprehensive Income, Tax | (10) | (1) | 15
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | 11 | (4) | (31)
PSEG Power LLC | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax | 34 | 10 | (11)
Amount Reclassified from AOCI for Available for Sale Securities, Tax | (14) | (4) | 5
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | 20 | 6 | (6)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | 20 | 6 | (6)
PSEG Power LLC | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from AOCI for Pension and OPEB Plans, Pre-Tax | (13) | (13) | (35)
Amount Reclassified from AOCI for Pension and OPEB Plans, Tax | 4 | 3 | 10
Amount Reclassified from AOCI for Pension and OPEB Plans, After-Tax | (9) | (10) | (25)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | (9) | (10) | (25)
PSEG Power LLC | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | 0 | 0 | 0
PSEG Power LLC | Net Gains (Losses) on Trust Investments [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax | 34 | 10 | (11)
Amount Reclassified from AOCI for Available for Sale Securities, Tax | (14) | (4) | 5
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | 20 | 6 | (6)
PSEG Power LLC | Non-Operating Pension and OPEB Credits (Costs) [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amortization of Prior Service (Cost) Credit, Pre-Tax | 21 | 23 | 5
Amortization of Prior Service (Cost) Credit, Tax | (6) | (7) | (1)
Amortization of Prior Service (Cost) Credit, After-Tax | 15 | 16 | 4
Amortization of Actuarial Loss, Pre-Tax | (34) | (36) | (40)
Amortization of Actuarial Loss, Tax | 10 | 10 | 11
Amortization of Actuarial Loss, After-Tax | $ (24) | $ (26) | $ (29)

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