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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Total Amount of Unrecognized Tax Benefits at January | $ 332 | $ 478 | $ 402
Increases as a Result of Positions Taken in a Prior Period | 87 | 82 | 83
Decreases as a Result of Positions Taken in a Prior Period | (50) | (190) | (30)
Increases as a Result of Positions Taken during the Current Period | 28 | 30 | 23
Decreases as a Result of Positions Taken during the Current Period | (1) | (8) | 0
Decreases as a Result of Settlements with Taxing Authorities | (10) | (60) | 0
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 386 | 332 | 478
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (264) | (225) | (320)
Regulatory Asset-Unrecognized Tax Benefits | (27) | (27) | (30)
Amount of unrecognized tax benefits that would affect the effective tax rate | 95 | 80 | 128
Power [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Total Amount of Unrecognized Tax Benefits at January | 70 | 156 | 134
Increases as a Result of Positions Taken in a Prior Period | 28 | 17 | 33
Decreases as a Result of Positions Taken in a Prior Period | (6) | (80) | (19)
Increases as a Result of Positions Taken during the Current Period | 23 | 9 | 8
Decreases as a Result of Positions Taken during the Current Period | 0 | (8) | 0
Decreases as a Result of Settlements with Taxing Authorities | (4) | (24) | 0
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 111 | 70 | 156
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (68) | (52) | (105)
Regulatory Asset-Unrecognized Tax Benefits | 0 | 0 | 0
Amount of unrecognized tax benefits that would affect the effective tax rate | 43 | 18 | 51
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 | 165 | 208 | 163
Increases as a Result of Positions Taken in a Prior Period | 55 | 65 | 39
Decreases as a Result of Positions Taken in a Prior Period | (43) | (92) | (9)
Increases as a Result of Positions Taken during the Current Period | 5 | 16 | 15
Decreases as a Result of Positions Taken during the Current Period | (1) | 0 | 0
Decreases as a Result of Settlements with Taxing Authorities | 0 | (32) | 0
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 181 | 165 | 208
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (162) | (138) | (177)
Regulatory Asset-Unrecognized Tax Benefits | (27) | (27) | (30)
Amount of unrecognized tax benefits that would affect the effective tax rate | (8) | 0 | 1
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 | 95 | 110 | 101
Increases as a Result of Positions Taken in a Prior Period | 4 | 0 | 11
Decreases as a Result of Positions Taken in a Prior Period | (1) | (18) | (2)
Increases as a Result of Positions Taken during the Current Period | 0 | 5 | 0
Decreases as a Result of Positions Taken during the Current Period | 0 | 0 | 0
Decreases as a Result of Settlements with Taxing Authorities | (5) | (2) | 0
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 93 | 95 | 110
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (34) | (35) | (37)
Regulatory Asset-Unrecognized Tax Benefits | 0 | 0 | 0
Amount of unrecognized tax benefits that would affect the effective tax rate | $ 59 | $ 60 | $ 73

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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