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Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | $ 2 | $ (12) | $ (6) | $ (39) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | (3) | 3 | 0 | 12 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (1) | (9) | (6) | (27) |
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 | (1) |  | (2) |  | $ 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (1) | 0 | (1) | 0 | $ 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax | 0 |  | (1) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | (1) |  | (1) |  |
Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax | (3) | (10) | (13) | (31) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 0 | 3 | 3 | 9 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (3) | (7) | (10) | (22) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (3) | (7) | (10) | (22) |
Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | 6 | (2) | 9 | (8) |
Reclassification for Available for Sale Securities, Tax | (3) | 0 | (4) | 3 |
Reclassification for Available for Sale Securities, After-Tax | 3 | (2) | 5 | (5) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 3 | (2) | 5 | (5) |
PSEG Power [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 2 | (11) | (4) | (34) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | (1) | 3 | 0 | 11 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 1 | (8) | (4) | (23) |
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) | (10) | (11) | (27) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 1 | 3 | 3 | 8 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (2) | (7) | (8) | (19) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (2) | (7) | (8) | (19) |
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 | 5 | (1) | 7 | (7) |
Reclassification for Available for Sale Securities, Tax | (2) | 0 | (3) | 3 |
Reclassification for Available for Sale Securities, After-Tax | 3 | (1) | 4 | (4) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 3 | (1) | 4 | (4) |
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 | (1) |  | (2) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax | 0 |  | (1) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | (1) |  | (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 |  |  | 20 | 3 |
Amortization of Prior Service (Cost) Credit, Tax |  |  | (6) | 0 |
Amortization of Prior Service (Cost) Credit, After-Tax |  |  | 14 | 3 |
Amortization of Actuarial Loss, Pre-Tax |  |  | (33) | (34) |
Amortization of Actuarial Loss, Tax |  |  | 9 | 9 |
Amortization of Actuarial Loss, After-Tax |  |  | (24) | (25) |
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 |  |  | 17 | 3 |
Amortization of Prior Service (Cost) Credit, Tax |  |  | (5) | 0 |
Amortization of Prior Service (Cost) Credit, After-Tax |  |  | 12 | 3 |
Amortization of Actuarial Loss, Pre-Tax |  |  | (28) | (30) |
Amortization of Actuarial Loss, Tax |  |  | 8 | 8 |
Amortization of Actuarial Loss, After-Tax |  |  | (20) | (22) |
Operating Expense [Member] | Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amortization of Prior Service (Cost) Credit, Pre-Tax | 7 | 1 |  |  |
Amortization of Prior Service (Cost) Credit, Tax | (2) | 0 |  |  |
Amortization of Prior Service (Cost) Credit, After-Tax | 5 | 1 |  |  |
Amortization of Actuarial Loss, Pre-Tax | (10) | (11) |  |  |
Amortization of Actuarial Loss, Tax | 2 | 3 |  |  |
Amortization of Actuarial Loss, After-Tax | (8) | (8) |  |  |
Operating Expense [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 | 1 |  |  |
Amortization of Prior Service (Cost) Credit, Tax | (2) | 0 |  |  |
Amortization of Prior Service (Cost) Credit, After-Tax | 4 | 1 |  |  |
Amortization of Actuarial Loss, Pre-Tax | (9) | (11) |  |  |
Amortization of Actuarial Loss, Tax | 3 | 3 |  |  |
Amortization of Actuarial Loss, After-Tax | (6) | (8) |  |  |
Other Income [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | 6 | (2) |  |  |
Reclassification for Available for Sale Securities, Tax | (3) | 0 |  |  |
Reclassification for Available for Sale Securities, After-Tax | 3 | (2) |  |  |
Other Income [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 | 5 | (1) |  |  |
Reclassification for Available for Sale Securities, Tax | (2) | 0 |  |  |
Reclassification for Available for Sale Securities, After-Tax | $ 3 | $ (1) |  |  |
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 | (8) |
Reclassification for Available for Sale Securities, Tax |  |  | (4) | 3 |
Reclassification for Available for Sale Securities, After-Tax |  |  | 5 | (5) |
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 | (7) |
Reclassification for Available for Sale Securities, Tax |  |  | (3) | 3 |
Reclassification for Available for Sale Securities, After-Tax |  |  | $ 4 | $ (4) |

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