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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Total Amount of Unrecognized Tax Benefits at January | $ 328 | $ 386 | $ 332
Increases as a Result of Positions Taken in a Prior Period | 40 | 12 | 87
Decreases as a Result of Positions Taken in a Prior Period | (32) | (62) | (50)
Increases as a Result of Positions Taken during the Current Period | 12 | 19 | 28
Decreases as a Result of Positions Taken during the Current Period | (1) | 0 | (1)
Decreases as a Result of Settlements with Taxing Authorities | 0 | 0 | (10)
Decreases due to Lapses of Applicable Statute of Limitations | (13) | (27) | 0
Total Amount of Unrecognized Tax Benefits at December | 334 | 328 | 386
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (157) | (200) | (264)
Regulatory Asset-Unrecognized Tax Benefits | (56) | (31) | (27)
Amount of unrecognized tax benefits that would affect the effective tax rate | 121 | 97 | 95
Power [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Total Amount of Unrecognized Tax Benefits at January | 128 | 111 | 70
Increases as a Result of Positions Taken in a Prior Period | 18 | 6 | 28
Decreases as a Result of Positions Taken in a Prior Period | (10) | (1) | (6)
Increases as a Result of Positions Taken during the Current Period | 6 | 12 | 23
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 | (4)
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 142 | 128 | 111
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (72) | (74) | (68)
Regulatory Asset-Unrecognized Tax Benefits | 0 | 0 | 0
Amount of unrecognized tax benefits that would affect the effective tax rate | 70 | 54 | 43
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 | 140 | 181 | 165
Increases as a Result of Positions Taken in a Prior Period | 15 | 3 | 55
Decreases as a Result of Positions Taken in a Prior Period | (11) | (23) | (43)
Increases as a Result of Positions Taken during the Current Period | 5 | 6 | 5
Decreases as a Result of Positions Taken during the Current Period | (1) | 0 | (1)
Decreases as a Result of Settlements with Taxing Authorities | 0 | 0 | 0
Decreases due to Lapses of Applicable Statute of Limitations | (13) | (27) | 0
Total Amount of Unrecognized Tax Benefits at December | 135 | 140 | 181
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (73) | (106) | (162)
Regulatory Asset-Unrecognized Tax Benefits | (56) | (31) | (27)
Amount of unrecognized tax benefits that would affect the effective tax rate | 6 | 3 | (8)
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 | 57 | 93 | 95
Increases as a Result of Positions Taken in a Prior Period | 8 | 2 | 4
Decreases as a Result of Positions Taken in a Prior Period | (13) | (38) | (1)
Increases as a Result of Positions Taken during the Current Period | 1 | 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 | 0 | (5)
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 53 | 57 | 93
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (12) | (20) | (34)
Regulatory Asset-Unrecognized Tax Benefits | 0 | 0 | 0
Amount of unrecognized tax benefits that would affect the effective tax rate | $ 41 | $ 37 | $ 59

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