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Recent Accounting Standards New Standards Adopted (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018 | Dec. 31, 2015
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  | $ 2,468 | $ 2,394 |  | $ 2,818 | $ 2,107 | $ 2,254 | $ 2,142 | $ 2,591 | $ 2,016 | $ 9,696 | $ 9,094 | $ 8,966 |  |
Energy Costs |  |  |  |  |  |  |  |  |  |  | 3,225 | 2,778 | 2,901 |  |
Operation and Maintenance |  |  |  |  |  |  |  |  |  |  | 3,015 | 2,901 | 2,991 |  |
After-tax adjustment for new accounting standard |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | $ 176 |
Accumulated other comprehensive income (loss) |  | 14,377 |  |  |  | 13,847 |  |  |  |  | 14,377 | 13,847 | 13,130 |  | $ 13,067
Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax adjustment for new accounting standard |  |  |  |  |  |  |  |  |  |  |  |  |  | 342 |
After-tax adjustment for new accounting standard |  |  |  |  |  |  |  |  |  |  |  |  |  | 176 |
PSE&G [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  | 1,645 | 1,595 | $ 1,386 | 1,845 | 1,575 | 1,530 | 1,393 | 1,826 |  | 6,471 | 6,324 | 6,303 |  |
Energy Costs |  |  |  |  |  |  |  |  |  |  | 2,520 | 2,421 | 2,644 |  |
Operation and Maintenance |  |  |  |  |  |  |  |  |  |  | 1,575 | 1,458 | 1,465 |  |
Accumulated other comprehensive income (loss) |  | 10,900 |  |  |  | 9,834 |  |  |  |  | 10,900 | 9,834 | 8,712 |  | 7,573
PSE&G [Member] | Accounting Standard Update 2017-07 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Change in Expense related to new presentation of pension and OPEB costs |  |  |  |  |  |  |  |  |  |  | 58 |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  |  |  |  |  |  |  | 8 | 15 |  |
PSE&G [Member] | Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  | 81 |  |  |  |
Accumulated other comprehensive income (loss) |  | 81 |  |  |  |  |  |  |  |  | 81 |  |  |  |
Power [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  | 1,108 | $ 868 | $ 767 | $ 1,403 | 827 | $ 846 | $ 918 | $ 1,269 |  | 4,146 | 3,860 | 3,861 |  |
Energy Costs |  |  |  |  |  |  |  |  |  |  | 2,197 | 1,913 | 1,824 |  |
Operation and Maintenance |  |  |  |  |  |  |  |  |  |  | 999 | 1,046 | 1,139 |  |
After-tax adjustment for new accounting standard |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | $ 175 |
Accumulated other comprehensive income (loss) |  | 5,960 |  |  |  | $ 5,967 |  |  |  |  | 5,960 | 5,967 | 5,799 |  | $ 6,002
Power [Member] | Accounting Standard Update 2017-07 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  |  |  |  |  |  |  | (8) | 4 |  |
Power [Member] | Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  | 69 |  |  |  |
Accumulated other comprehensive income (loss) |  | $ 69 |  |  |  |  |  |  |  |  | $ 69 |  |  |  |
Subsequent Event [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 | $ 280 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | PSE&G [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 | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Power [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 | $ 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restatement Adjustment [Member] | PSE&G [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  | 90 | (82) |  |
Energy Costs |  |  |  |  |  |  |  |  |  |  |  | 58 | 77 |  |
Operation and Maintenance |  |  |  |  |  |  |  |  |  |  |  | 32 | 5 |  |
Restatement Adjustment [Member] | Power [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  | 70 | 162 |  |
Energy Costs |  |  |  |  |  |  |  |  |  |  |  | $ (70) | $ (162) |  |

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