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Recent Accounting Standards New Standards Adopted (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | Jan. 01, 2018 | Dec. 31, 2016
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | $ 2,478 | $ 2,302 | $ 2,316 | $ 2,980 | $ 2,468 | $ 2,394 | $ 2,016 | $ 2,818 | $ 10,076 | $ 9,696 | $ 9,094 |  |  |
Energy Costs |  |  |  |  |  |  |  |  | 3,372 | 3,225 | 2,778 |  |  |
Operation and Maintenance |  |  |  |  |  |  |  |  | 3,111 | 3,069 | 2,901 |  |  |
After-tax adjustment for new accounting standard |  |  |  |  | 0 |  |  |  |  | 0 |  | $ 81 | $ 176 |
Accumulated other comprehensive income (loss) | 15,089 |  |  |  | 14,377 |  |  |  | 15,089 | 14,377 | 13,847 |  |  | $ 13,130
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of deferred rent liabilities and incentives |  |  |  | 21 |  |  |  |  |  |  |  |  |  |
Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Change in Expense related to new presentation of pension and OPEB costs |  |  |  |  |  |  |  |  | 81 |  |  |  |  |
Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | 1,607 | 1,604 | 1,382 | 2,032 | 1,645 | 1,595 | 1,386 | 1,845 | 6,625 | 6,471 | 6,324 |  |  |
Energy Costs |  |  |  |  |  |  |  |  | 2,738 | 2,520 | 2,421 |  |  |
Operation and Maintenance |  |  |  |  |  |  |  |  | 1,581 | 1,575 | 1,458 |  |  |
Accumulated other comprehensive income (loss) | 11,903 |  |  |  | 10,900 |  |  |  | 11,903 | 10,900 | 9,834 |  |  | 8,712
Public Service Electric and Gas Company | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Change in Expense related to new presentation of pension and OPEB costs |  |  |  | 91 |  |  |  |  |  |  |  |  |  |
PSEG Power LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | 1,115 | $ 771 | $ 1,083 | 1,416 | 1,108 | $ 868 | $ 767 | $ 1,403 | 4,385 | 4,146 | 3,860 |  |  |
Energy Costs |  |  |  |  |  |  |  |  | 2,118 | 2,197 | 1,913 |  |  |
Operation and Maintenance |  |  |  |  |  |  |  |  | 1,040 | 1,053 | 1,046 |  |  |
After-tax adjustment for new accounting standard |  |  |  |  | 0 |  |  |  |  | 0 |  | $ 69 | $ 175 |
Accumulated other comprehensive income (loss) | $ 5,890 |  |  |  | $ 5,960 |  |  |  | 5,890 | $ 5,960 | $ 5,967 |  |  | $ 5,799
PSEG Power LLC | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Change in Expense related to new presentation of pension and OPEB costs |  |  |  | 46 |  |  |  |  |  |  |  |  |  |
PSEG Power LLC | Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Change in Expense related to new presentation of pension and OPEB costs |  |  |  |  |  |  |  |  | $ 69 |  |  |  |  |
Operating Lease Right of Use Assets [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Change in Expense related to new presentation of pension and OPEB costs |  |  |  | 261 |  |  |  |  |  |  |  |  |  |
Operating Lease Liabilities [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Change in Expense related to new presentation of pension and OPEB costs |  |  |  | $ 282 |  |  |  |  |  |  |  |  |  |

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