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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Total Amount of Unrecognized Tax Benefits at January | $ 321 | $ 318 | $ 334
Increases as a Result of Positions Taken in a Prior Period | 33 | 17 | 11
Decreases as a Result of Positions Taken in a Prior Period | (91) | (37) | (70)
Increases as a Result of Positions Taken during the Current Period | 0 | 27 | 52
Decreases as a Result of Positions Taken during the Current Period | 0 | 0 | (3)
Decreases as a Result of Settlements with Taxing Authorities | (116) | (4) | (6)
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 147 | 321 | 318
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (69) | (184) | (173)
Regulatory Asset-Unrecognized Tax Benefits | (15) | (46) | (46)
Amount of unrecognized tax benefits that would affect the effective tax rate | 63 | 91 | 99
PSEG Power LLC |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Total Amount of Unrecognized Tax Benefits at January | 161 | 151 | 142
Increases as a Result of Positions Taken in a Prior Period | 10 | 8 | 4
Decreases as a Result of Positions Taken in a Prior Period | (36) | (13) | (37)
Increases as a Result of Positions Taken during the Current Period | 0 | 15 | 48
Decreases as a Result of Positions Taken during the Current Period | 0 | 0 | 0
Decreases as a Result of Settlements with Taxing Authorities | (52) | 0 | (6)
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 83 | 161 | 151
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (49) | (105) | (104)
Regulatory Asset-Unrecognized Tax Benefits | 0 | 0 | 0
Amount of unrecognized tax benefits that would affect the effective tax rate | 34 | 56 | 47
Public Service Electric and Gas Company |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Total Amount of Unrecognized Tax Benefits at January | 124 | 108 | 135
Increases as a Result of Positions Taken in a Prior Period | 21 | 5 | 4
Decreases as a Result of Positions Taken in a Prior Period | (51) | (1) | (31)
Increases as a Result of Positions Taken during the Current Period | 0 | 12 | 3
Decreases as a Result of Positions Taken during the Current Period | 0 | 0 | (3)
Decreases as a Result of Settlements with Taxing Authorities | (64) | 0 | 0
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 30 | 124 | 108
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (12) | (71) | (57)
Regulatory Asset-Unrecognized Tax Benefits | (15) | (46) | (46)
Amount of unrecognized tax benefits that would affect the effective tax rate | 3 | 7 | 5
Energy Holdings [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Total Amount of Unrecognized Tax Benefits at January | 33 | 54 | 53
Increases as a Result of Positions Taken in a Prior Period | 1 | 5 | 3
Decreases as a Result of Positions Taken in a Prior Period | (4) | (22) | (2)
Increases as a Result of Positions Taken during the Current Period | 0 | 0 | 0
Decreases as a Result of Positions Taken during the Current Period | 0 | 0 | 0
Decreases as a Result of Settlements with Taxing Authorities | 0 | (4) | 0
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 30 | 33 | 54
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (8) | (7) | (12)
Regulatory Asset-Unrecognized Tax Benefits | 0 | 0 | 0
Amount of unrecognized tax benefits that would affect the effective tax rate | $ 22 | $ 26 | $ 42

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