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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Total Amount of Unrecognized Tax Benefits at January | $ 147 | $ 321 | $ 318
Increases as a Result of Positions Taken in a Prior Period | 58 | 33 | 17
Decreases as a Result of Positions Taken in a Prior Period | (19) | (91) | (37)
Increases as a Result of Positions Taken during the Current Period | 6 | 0 | 27
Decreases as a Result of Positions Taken during the Current Period | 0 | 0 | 0
Decreases as a Result of Settlements with Taxing Authorities | 0 | (116) | (4)
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 192 | 147 | 321
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (76) | (69) | (184)
Regulatory Asset-Unrecognized Tax Benefits | (7) | (15) | (46)
Amount of unrecognized tax benefits that would affect the effective tax rate | 109 | 63 | 91
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 | 30 | 124 | 108
Increases as a Result of Positions Taken in a Prior Period | 8 | 21 | 5
Decreases as a Result of Positions Taken in a Prior Period | (12) | (51) | (1)
Increases as a Result of Positions Taken during the Current Period | 1 | 0 | 12
Decreases as a Result of Positions Taken during the Current Period | 0 | 0 | 0
Decreases as a Result of Settlements with Taxing Authorities | 0 | (64) | 0
Decreases due to Lapses of Applicable Statute of Limitations | 0 | 0 | 0
Total Amount of Unrecognized Tax Benefits at December | 27 | 30 | 124
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits | (15) | (12) | (71)
Regulatory Asset-Unrecognized Tax Benefits | (7) | (15) | (46)
Amount of unrecognized tax benefits that would affect the effective tax rate | $ 5 | $ 3 | $ 7

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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