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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Total Amount of Unrecognized Tax Benefits at January | $ 334 | $ 328 | $ 386
Increases as a Result of Positions Taken in a Prior Period | 11 | 40 | 12
Decreases as a Result of Positions Taken in a Prior Period | (70) | (32) | (62)
Increases as a Result of Positions Taken during the Current Period | 52 | 12 | 19
Decreases as a Result of Positions Taken during the Current Period | (3) | (1) | 0
Decreases as a Result of Settlements with Taxing Authorities | (6) | 0 | 0
Decreases due to Lapses of Applicable Statute of Limitations | 0 | (13) | (27)
Total Amount of Unrecognized Tax Benefits at December | 318 | 334 | 328
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (173) | (157) | (200)
Regulatory Asset-Unrecognized Tax Benefits | (46) | (56) | (31)
Amount of unrecognized tax benefits that would affect the effective tax rate | 99 | 121 | 97
Power [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Total Amount of Unrecognized Tax Benefits at January | 142 | 128 | 111
Increases as a Result of Positions Taken in a Prior Period | 4 | 18 | 6
Decreases as a Result of Positions Taken in a Prior Period | (37) | (10) | (1)
Increases as a Result of Positions Taken during the Current Period | 48 | 6 | 12
Decreases as a Result of Positions Taken during the Current Period | 0 | 0 | 0
Decreases as a Result of Settlements with Taxing Authorities | (6) | 0 | 0
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 151 | 142 | 128
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (104) | (72) | (74)
Regulatory Asset-Unrecognized Tax Benefits | 0 | 0 | 0
Amount of unrecognized tax benefits that would affect the effective tax rate | 47 | 70 | 54
PSE&G [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Total Amount of Unrecognized Tax Benefits at January | 135 | 140 | 181
Increases as a Result of Positions Taken in a Prior Period | 4 | 15 | 3
Decreases as a Result of Positions Taken in a Prior Period | (31) | (11) | (23)
Increases as a Result of Positions Taken during the Current Period | 3 | 5 | 6
Decreases as a Result of Positions Taken during the Current Period | (3) | (1) | 0
Decreases as a Result of Settlements with Taxing Authorities | 0 | 0 | 0
Decreases due to Lapses of Applicable Statute of Limitations | 0 | (13) | (27)
Total Amount of Unrecognized Tax Benefits at December | 108 | 135 | 140
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (57) | (73) | (106)
Regulatory Asset-Unrecognized Tax Benefits | (46) | (56) | (31)
Amount of unrecognized tax benefits that would affect the effective tax rate | 5 | 6 | 3
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 | 53 | 57 | 93
Increases as a Result of Positions Taken in a Prior Period | 3 | 8 | 2
Decreases as a Result of Positions Taken in a Prior Period | (2) | (13) | (38)
Increases as a Result of Positions Taken during the Current Period | 0 | 1 | 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 | 0 | 0
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 54 | 53 | 57
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (12) | (12) | (20)
Regulatory Asset-Unrecognized Tax Benefits | 0 | 0 | 0
Amount of unrecognized tax benefits that would affect the effective tax rate | $ 42 | $ 41 | $ 37

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