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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Total Amount of Unrecognized Tax Benefits at January | $ 318 | $ 334 | $ 328
Increases as a Result of Positions Taken in a Prior Period | 17 | 11 | 40
Decreases as a Result of Positions Taken in a Prior Period | (37) | (70) | (32)
Increases as a Result of Positions Taken during the Current Period | 27 | 52 | 12
Decreases as a Result of Positions Taken during the Current Period | 0 | (3) | (1)
Decreases as a Result of Settlements with Taxing Authorities | (4) | (6) | 0
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | (13)
Total Amount of Unrecognized Tax Benefits at December | 321 | 318 | 334
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (184) | (173) | (157)
Regulatory Asset-Unrecognized Tax Benefits | (46) | (46) | (56)
Amount of unrecognized tax benefits that would affect the effective tax rate | 91 | 99 | 121
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 | 151 | 142 | 128
Increases as a Result of Positions Taken in a Prior Period | 8 | 4 | 18
Decreases as a Result of Positions Taken in a Prior Period | (13) | (37) | (10)
Increases as a Result of Positions Taken during the Current Period | 15 | 48 | 6
Decreases as a Result of Positions Taken during the Current Period | 0 | 0 | 0
Decreases as a Result of Settlements with Taxing Authorities | 0 | (6) | 0
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 161 | 151 | 142
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (105) | (104) | (72)
Regulatory Asset-Unrecognized Tax Benefits | 0 | 0 | 0
Amount of unrecognized tax benefits that would affect the effective tax rate | 56 | 47 | 70
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 | 108 | 135 | 140
Increases as a Result of Positions Taken in a Prior Period | 5 | 4 | 15
Decreases as a Result of Positions Taken in a Prior Period | (1) | (31) | (11)
Increases as a Result of Positions Taken during the Current Period | 12 | 3 | 5
Decreases as a Result of Positions Taken during the Current Period | 0 | (3) | (1)
Decreases as a Result of Settlements with Taxing Authorities | 0 | 0 | 0
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | (13)
Total Amount of Unrecognized Tax Benefits at December | 124 | 108 | 135
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (71) | (57) | (73)
Regulatory Asset-Unrecognized Tax Benefits | (46) | (46) | (56)
Amount of unrecognized tax benefits that would affect the effective tax rate | 7 | 5 | 6
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 | 54 | 53 | 57
Increases as a Result of Positions Taken in a Prior Period | 5 | 3 | 8
Decreases as a Result of Positions Taken in a Prior Period | (22) | (2) | (13)
Increases as a Result of Positions Taken during the Current Period | 0 | 0 | 1
Decreases as a Result of Positions Taken during the Current Period | 0 | 0 | 0
Decreases as a Result of Settlements with Taxing Authorities | (4) | 0 | 0
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 33 | 54 | 53
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (7) | (12) | (12)
Regulatory Asset-Unrecognized Tax Benefits | 0 | 0 | 0
Amount of unrecognized tax benefits that would affect the effective tax rate | $ 26 | $ 42 | $ 41

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