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Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | $ 3 | $ (6) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | (1) | 2 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 2 | (4) |
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 | (2) |  | $ (4)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (1) | 0 | $ (3)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax | (1) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | (1) |  |
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) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 1 | 2 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (3) | (3) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (3) | (3) |
Available-for-Sale Securities [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | 9 | (1) |
Reclassification for Available for Sale Securities, Tax | (3) | 0 |
Reclassification for Available for Sale Securities, After-Tax | 6 | (1) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 6 | (1) |
PSEG Power [Member] |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 4 | (5) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | (2) | 1 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 2 | (4) |
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 |
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) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 1 | 1 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (2) | (3) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (2) | (3) |
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 | 7 | (1) |
Reclassification for Available for Sale Securities, Tax | (3) | 0 |
Reclassification for Available for Sale Securities, After-Tax | 4 | (1) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 4 | (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 | (2) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax | (1) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | (1) |  |
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 | 7 |
Amortization of Prior Service (Cost) Credit, Tax | (2) | (2) |
Amortization of Prior Service (Cost) Credit, After-Tax | 4 | 5 |
Amortization of Actuarial Loss, Pre-Tax | (10) | (12) |
Amortization of Actuarial Loss, Tax | 3 | 4 |
Amortization of Actuarial Loss, After-Tax | (7) | (8) |
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 | 5 | 6 |
Amortization of Prior Service (Cost) Credit, Tax | (1) | (2) |
Amortization of Prior Service (Cost) Credit, After-Tax | 4 | 4 |
Amortization of Actuarial Loss, Pre-Tax | (8) | (10) |
Amortization of Actuarial Loss, Tax | 2 | 3 |
Amortization of Actuarial Loss, After-Tax | (6) | (7) |
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 | 9 | (1) |
Reclassification for Available for Sale Securities, Tax | (3) | 0 |
Reclassification for Available for Sale Securities, After-Tax | 6 | (1) |
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 | 7 | (1) |
Reclassification for Available for Sale Securities, Tax | (3) | 0 |
Reclassification for Available for Sale Securities, After-Tax | $ 4 | $ (1) |

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