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Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 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
Segment Reporting Information [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
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,158 | 1,986 | 1,476
Operating Income (Loss) |  | 501 | [1] | $ 554 | $ 832 | [1] | 363 | [1] | $ 693 | $ 195 | [1] | $ 178 | [1] | $ 411 | [1] | 2,298 | 1,429 | 1,598
Income from Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 | 14 | 11
Interest Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29 | 30 | 30
Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (476) | (391) | (385)
Income (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,855 | 1,268 | 1,298
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 417 | (306) | 411
Net Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,438 | 1,574 | 887
Gross Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,912 | 4,190 | 4,199
Total Assets |  | 45,326 |  |  |  |  | 42,716 |  |  |  |  |  |  |  |  | 45,326 | 42,716 | 40,070
Investments in Equity Method Subsidiaries |  | 86 |  |  |  |  | 87 |  |  |  |  |  |  |  |  | 86 | 87 | 102
Power [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,146 | 3,860 | 3,861
PSE&G [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,471 | 6,324 | 6,303
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 571 | 466 | 370
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,492) | (1,556) | (1,568)
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,438 | 1,574 | 887
Operating Segments [Member] | Power [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,146 | 3,860 | 3,861
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 354 | 1,268 | 881
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 596 | (367) | 17
Income from Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 | 14 | 11
Interest Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 3 | 4
Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (76) | (50) | (84)
Income (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 431 | (250) | (43)
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66 | (729) | (61)
Net Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 365 | 479 | 18
Gross Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 996 | 1,231 | 1,343
Total Assets |  | 12,594 |  |  |  |  | 12,418 |  |  |  |  |  |  |  |  | 12,594 | 12,418 | 12,193
Investments in Equity Method Subsidiaries |  | 86 |  |  |  |  | 87 |  |  |  |  |  |  |  |  | 86 | 87 | 102
Operating Segments [Member] | PSE&G [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,471 | 6,324 | 6,303
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 770 | 685 | 565
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,606 | 1,760 | 1,629
Income from Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21 | 24 | 24
Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (333) | (303) | (289)
Income (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,411 | 1,536 | 1,404
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 344 | 563 | 515
Net Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,067 | 973 | 889
Gross Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,896 | 2,919 | 2,816
Total Assets |  | 31,109 |  |  |  |  | 28,554 |  |  |  |  |  |  |  |  | 31,109 | 28,554 | 26,288
Investments in Equity Method Subsidiaries |  | 0 |  |  |  |  | 0 |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Segments [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 571 | 466 | 370
Depreciation and Amortization | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34 | 33 | 30
Operating Income (Loss) | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96 | 36 | (48)
Income from Equity Method Investments | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest Income | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 | 5 | 4
Interest Expense | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (73) | (40) | (14)
Income (Loss) before Income Taxes | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 | (18) | (63)
Income Tax Expense (Benefit) | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 | (140) | (43)
Net Income (Loss) | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 | 122 | (20)
Gross Additions to Long-Lived Assets | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 | 40 | 40
Total Assets | [2] | 2,604 |  |  |  |  | 2,666 |  |  |  |  |  |  |  |  | 2,604 | 2,666 | 2,373
Investments in Equity Method Subsidiaries | [2] | 0 |  |  |  |  | 0 |  |  |  |  |  |  |  |  | 0 | 0 | 0
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,492) | (1,556) | (1,568)
Depreciation and Amortization | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Income (Loss) | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income from Equity Method Investments | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest Income | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6) | (2) | (2)
Interest Expense | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 | 2 | 2
Income (Loss) before Income Taxes | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income Tax Expense (Benefit) | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income (Loss) | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0
Gross Additions to Long-Lived Assets | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total Assets | [3] | (981) |  |  |  |  | (922) |  |  |  |  |  |  |  |  | (981) | (922) | (784)
Investments in Equity Method Subsidiaries | [3] | $ 0 |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
[1] | The increases in Operating Income at PSEG consolidated and Power in the first and second quarters of 2018 as compared to the same quarters in 2017 were primarily due to higher costs in 2017 related to closing the coal/gas Hudson and Mercer units, which were fully depreciated as of June 1, 2017. The increases in Operating Income at PSEG consolidated and Power in the fourth quarter 2018 as compared to the same quarter in 2017 were primarily due to lower MTM losses and a gain on the sale of the Hudson and Mercer units.The decreases in Net Income at PSEG consolidated and Power in the fourth quarter 2018 as compared to the same quarter in 2017 also reflected the impact of the one-time benefit recorded in December 2017 as a result of the remeasurement of deferred tax balances and the inclusion in 2018 of net unrealized losses on equity investments in the NDT Fund in accordance with new accounting guidance.
[2] | Includes amounts applicable to Energy Holdings and PSEG LI, which are below the quantitative threshold for separate disclosure as reportable segments. Other also includes amounts applicable to PSEG (parent corporation) and Services.
[3] | Intercompany eliminations primarily relate to intercompany transactions between PSE&G and Power. For a further discussion of the intercompany transactions between PSE&G and Power, see Note 25. Related-Party Transactions.

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