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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Total Amount of Unrecognized Tax Benefits at January | $ 386 | $ 332 | $ 478
Increases as a Result of Positions Taken in a Prior Period | 12 | 87 | 82
Decreases as a Result of Positions Taken in a Prior Period | (62) | (50) | (190)
Increases as a Result of Positions Taken during the Current Period | 19 | 28 | 30
Decreases as a Result of Positions Taken during the Current Period | 0 | (1) | (8)
Decreases as a Result of Settlements with Taxing Authorities | 0 | (10) | (60)
Decreases due to Lapses of Applicable Statute of Limitations | (27) | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 328 | 386 | 332
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (200) | (264) | (225)
Regulatory Asset-Unrecognized Tax Benefits | (31) | (27) | (27)
Amount of unrecognized tax benefits that would affect the effective tax rate | 97 | 95 | 80
Power [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Total Amount of Unrecognized Tax Benefits at January | 111 | 70 | 156
Increases as a Result of Positions Taken in a Prior Period | 6 | 28 | 17
Decreases as a Result of Positions Taken in a Prior Period | (1) | (6) | (80)
Increases as a Result of Positions Taken during the Current Period | 12 | 23 | 9
Decreases as a Result of Positions Taken during the Current Period | 0 | 0 | (8)
Decreases as a Result of Settlements with Taxing Authorities | 0 | (4) | (24)
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 128 | 111 | 70
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (74) | (68) | (52)
Regulatory Asset-Unrecognized Tax Benefits | 0 | 0 | 0
Amount of unrecognized tax benefits that would affect the effective tax rate | 54 | 43 | 18
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 | 181 | 165 | 208
Increases as a Result of Positions Taken in a Prior Period | 3 | 55 | 65
Decreases as a Result of Positions Taken in a Prior Period | (23) | (43) | (92)
Increases as a Result of Positions Taken during the Current Period | 6 | 5 | 16
Decreases as a Result of Positions Taken during the Current Period | 0 | (1) | 0
Decreases as a Result of Settlements with Taxing Authorities | 0 | 0 | (32)
Decreases due to Lapses of Applicable Statute of Limitations | (27) | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 140 | 181 | 165
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (106) | (162) | (138)
Regulatory Asset-Unrecognized Tax Benefits | (31) | (27) | (27)
Amount of unrecognized tax benefits that would affect the effective tax rate | 3 | (8) | 0
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 | 93 | 95 | 110
Increases as a Result of Positions Taken in a Prior Period | 2 | 4 | 0
Decreases as a Result of Positions Taken in a Prior Period | (38) | (1) | (18)
Increases as a Result of Positions Taken during the Current Period | 0 | 0 | 5
Decreases as a Result of Positions Taken during the Current Period | 0 | 0 | 0
Decreases as a Result of Settlements with Taxing Authorities | 0 | (5) | (2)
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 57 | 93 | 95
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (20) | (34) | (35)
Regulatory Asset-Unrecognized Tax Benefits | 0 | 0 | 0
Amount of unrecognized tax benefits that would affect the effective tax rate | $ 37 | $ 59 | $ 60

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