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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 09, 2014
Income Taxes [Line Items] |  |  |  |  |
Bonus depreciation for tax purposes |  | 50.00% |  |  |
Current ITC rate for qualified property |  | 30.00% |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority |  |  |  |  | $ 121
Income Tax Examination, Tax Expense | $ (12) |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  | $ 10 | $ 60 | $ 0 |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  | $ 50 | 190 | 30 |
Bonus Depreciation for Tax Purposes 2018 |  | 40.00% |  |  |
Bonus Depreciation for Tax Purposes 2019 |  | 30.00% |  |  |
2020 ITC rate for qualified property |  | 26.00% |  |  |
2021 ITC rate for qualified property |  | 22.00% |  |  |
PSEG [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Federal income tax rate |  | 35.00% |  |  |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes |  | 9.00% |  |  |
PSE&G [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  | $ 0 | 32 | 0 |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  | 43 | 92 | 9 |
Power [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  | 4 | 24 | 0 |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  | $ 6 | $ 80 | $ 19 |

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