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Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenues |  | $ 2,818 | $ 2,591 |
Net Income (Loss) |  | 558 | 114 |
Property, Plant and Equipment, Additions |  | 1,053 | 1,062 |
Total Assets |  | 42,790 |  | $ 42,716
Investments in Equity Method Subsidiaries |  | 86 |  | 87
PSE And G [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenues |  | 1,845 | 1,826 |
Power [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenues |  | 1,403 | 1,269 |
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenues |  | 147 | 83 |
Operating Segments [Member] | PSE And G [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenues |  | 1,845 | 1,826 |
Net Income (Loss) |  | 319 | 299 |
Property, Plant and Equipment, Additions |  | 750 | 748 |
Total Assets |  | 28,774 |  | 28,554
Investments in Equity Method Subsidiaries |  | 0 |  | 0
Operating Segments [Member] | Power [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenues |  | 1,403 | 1,269 |
Net Income (Loss) |  | 234 | (170) |
Property, Plant and Equipment, Additions |  | 299 | 307 |
Total Assets |  | 12,263 |  | 12,418
Investments in Equity Method Subsidiaries |  | 86 |  | 87
Operating Segments [Member] | Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenues | [1] | 147 | 83 |
Net Income (Loss) | [1] | 5 | (15) |
Property, Plant and Equipment, Additions | [1] | 4 | 7 |
Total Assets | [1] | 2,481 |  | 2,666
Investments in Equity Method Subsidiaries | [1] | 0 |  | 0
Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenues | [2] | (577) | (587) |
Net Income (Loss) | [2] | 0 | 0 |
Property, Plant and Equipment, Additions | [2] | 0 | $ 0 |
Total Assets | [2] | (728) |  | (922)
Investments in Equity Method Subsidiaries | [2] | $ 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 19. Related-Party Transactions.

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