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Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  | $ 2,096 | $ 2,263 | $ 2,133 | $ 2,592 | $ 2,090 | $ 2,450 | $ 1,905 | $ 2,616 | $ 9,084 | $ 9,061 | $ 10,415
Depreciation and Amortization |  |  |  |  |  |  |  |  |  | 1,986 | 1,476 | 1,214
Operating Income (Loss) |  | 362 | $ 693 | $ 196 | $ 178 | (175) | $ 577 | $ 347 | $ 827 | 1,429 | 1,576 | 2,962
Income from Equity Method Investments |  |  |  |  |  |  |  |  |  | 14 | 11 | 12
Interest Income |  |  |  |  |  |  |  |  |  | 30 | 30 | 31
Interest Expense |  |  |  |  |  |  |  |  |  | (391) | (385) | (393)
Income (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  | 1,268 | 1,298 | 2,680
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | (306) | 411 | 1,001
Net Income (Loss) |  |  |  |  |  |  |  |  |  | 1,574 | 887 | 1,679
Gross Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  | 4,190 | 4,199 | 3,863
Total Assets |  | 42,716 |  |  |  | 40,070 |  |  |  | 42,716 | 40,070 | 37,535
Investments in Equity Method Subsidiaries |  | 87 |  |  |  | 102 |  |  |  | 87 | 102 | 119
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) |  |  |  |  |  |  |  |  |  | 1,574 | 887 | 1,679
Operating Segments [Member] | Power [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  | 3,930 | 4,023 | 4,928
Depreciation and Amortization |  |  |  |  |  |  |  |  |  | 1,268 | 881 | 291
Operating Income (Loss) |  |  |  |  |  |  |  |  |  | (359) | 13 | 1,430
Income from Equity Method Investments |  |  |  |  |  |  |  |  |  | 14 | 11 | 14
Interest Income |  |  |  |  |  |  |  |  |  | 3 | 4 | 2
Interest Expense |  |  |  |  |  |  |  |  |  | (50) | (84) | (121)
Income (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  | (250) | (43) | 1,367
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | (729) | (61) | 511
Net Income (Loss) |  |  |  |  |  |  |  |  |  | 479 | 18 | 856
Gross Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  | 1,231 | 1,343 | 1,117
Total Assets |  | 12,418 |  |  |  | 12,193 |  |  |  | 12,418 | 12,193 | 12,250
Investments in Equity Method Subsidiaries |  | 87 |  |  |  | 102 |  |  |  | 87 | 102 | 119
Operating Segments [Member] | PSE&G [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  | 6,234 | 6,221 | 6,636
Depreciation and Amortization |  |  |  |  |  |  |  |  |  | 685 | 565 | 892
Operating Income (Loss) |  |  |  |  |  |  |  |  |  | 1,752 | 1,614 | 1,462
Income from Equity Method Investments |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest Income |  |  |  |  |  |  |  |  |  | 24 | 24 | 25
Interest Expense |  |  |  |  |  |  |  |  |  | (303) | (289) | (280)
Income (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  | 1,536 | 1,404 | 1,257
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | 563 | 515 | 470
Net Income (Loss) |  |  |  |  |  |  |  |  |  | 973 | 889 | 787
Gross Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  | 2,919 | 2,816 | 2,692
Total Assets |  | 28,554 |  |  |  | 26,288 |  |  |  | 28,554 | 26,288 | 23,677
Investments in Equity Method Subsidiaries |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Operating Segments [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | [1] |  |  |  |  |  |  |  |  | 466 | 370 | 462
Depreciation and Amortization | [1] |  |  |  |  |  |  |  |  | 33 | 30 | 31
Operating Income (Loss) | [1] |  |  |  |  |  |  |  |  | 36 | (51) | 70
Income from Equity Method Investments | [1] |  |  |  |  |  |  |  |  | 0 | 0 | (2)
Interest Income | [1] |  |  |  |  |  |  |  |  | 5 | 4 | 33
Interest Expense | [1] |  |  |  |  |  |  |  |  | (40) | (14) | (21)
Income (Loss) before Income Taxes | [1] |  |  |  |  |  |  |  |  | (18) | (63) | 56
Income Tax Expense (Benefit) | [1] |  |  |  |  |  |  |  |  | (140) | (43) | 20
Net Income (Loss) | [1] |  |  |  |  |  |  |  |  | 122 | (20) | 36
Gross Additions to Long-Lived Assets | [1] |  |  |  |  |  |  |  |  | 40 | 40 | 54
Total Assets | [1] | 2,666 |  |  |  | 2,373 |  |  |  | 2,666 | 2,373 | 2,810
Investments in Equity Method Subsidiaries | [1] | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | [2] |  |  |  |  |  |  |  |  | (1,546) | (1,553) | (1,611)
Depreciation and Amortization | [2] |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Income (Loss) | [2] |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income from Equity Method Investments | [2] |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest Income | [2] |  |  |  |  |  |  |  |  | (2) | (2) | (29)
Interest Expense | [2] |  |  |  |  |  |  |  |  | 2 | 2 | 29
Income (Loss) before Income Taxes | [2] |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income Tax Expense (Benefit) | [2] |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income (Loss) | [2] |  |  |  |  |  |  |  |  | 0 |  | 0
Gross Additions to Long-Lived Assets | [2] |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total Assets | [2] | (922) |  |  |  | (784) |  |  |  | (922) | (784) | (1,202)
Investments in Equity Method Subsidiaries | [2] | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 | $ 0
[1] | 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.
[2] | 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 24. Related-Party Transactions.

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