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Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | $ 9 | $ (2) | $ 12 | $ (8) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | (5) | 1 | (6) | 3 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 4 | (1) | 6 | (5) |
Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | (4) | (1) | (6) | (1) | $ (4)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (3) | 0 | (4) | 0 | $ (3)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax | (1) | (1) | (2) | (1) |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | (3) | 0 | (4) | 0 |
Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax | (4) | (5) | (8) | (10) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 1 | 1 | 2 | 3 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (3) | (4) | (6) | (7) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (3) | (4) | (6) | (7) |
Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | 17 | 4 | 26 | 3 |
Reclassification for Available for Sale Securities, Tax | (7) | (1) | (10) | (1) |
Reclassification for Available for Sale Securities, After-Tax | 10 | 3 | 16 | 2 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 10 | 3 | 16 | 2 |
PSEG Power [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 11 | (1) | 15 | (6) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | (5) | 0 | (7) | 1 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 6 | (1) | 8 | (5) |
PSEG Power [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0 |
PSEG Power [Member] | Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax | (3) | (4) | (6) | (8) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 0 | 1 | 1 | 2 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (3) | (3) | (5) | (6) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (3) | (3) | (5) | (6) |
PSEG Power [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | 14 | 3 | 21 | 2 |
Reclassification for Available for Sale Securities, Tax | (5) | (1) | (8) | (1) |
Reclassification for Available for Sale Securities, After-Tax | 9 | 2 | 13 | 1 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 9 | 2 | 13 | 1 |
Interest Expense [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | (4) | (1) | (6) | (1) |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax | (1) | 1 | (2) | 1 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | (3) | 0 | (4) | 0 |
Non-Operating Pension and OPEB Credits (Costs) [Member] | Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amortization of Prior Service (Cost) Credit, Pre-Tax | 6 | 6 | 12 | 13 |
Amortization of Prior Service (Cost) Credit, Tax | (1) | (2) | (3) | (4) |
Amortization of Prior Service (Cost) Credit, After-Tax | 5 | 4 | 9 | 9 |
Amortization of Actuarial Loss, Pre-Tax | (10) | (11) | (20) | (23) |
Amortization of Actuarial Loss, Tax | 2 | 3 | 5 | 7 |
Amortization of Actuarial Loss, After-Tax | (8) | (8) | (15) | (16) |
Non-Operating Pension and OPEB Credits (Costs) [Member] | PSEG Power [Member] | Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amortization of Prior Service (Cost) Credit, Pre-Tax | 6 | 5 | 11 | 11 |
Amortization of Prior Service (Cost) Credit, Tax | (2) | (1) | (3) | (3) |
Amortization of Prior Service (Cost) Credit, After-Tax | 4 | 4 | 8 | 8 |
Amortization of Actuarial Loss, Pre-Tax | (9) | (9) | (17) | (19) |
Amortization of Actuarial Loss, Tax | 2 | 2 | 4 | 5 |
Amortization of Actuarial Loss, After-Tax | (7) | (7) | (13) | (14) |
Net Gains (Losses) on Trust Investments [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | 17 | 4 | 26 | 3 |
Reclassification for Available for Sale Securities, Tax | (7) | (1) | (10) | (1) |
Reclassification for Available for Sale Securities, After-Tax | 10 | 3 | 16 | 2 |
Net Gains (Losses) on Trust Investments [Member] | PSEG Power [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | 14 | 3 | 21 | 2 |
Reclassification for Available for Sale Securities, Tax | (5) | (1) | (8) | (1) |
Reclassification for Available for Sale Securities, After-Tax | $ 9 | $ 2 | $ 13 | $ 1 |

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