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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  | $ 2,090 | $ 2,450 | $ 1,905 | $ 2,616 | $ 2,278 | $ 2,688 | $ 2,314 | $ 3,135 | $ 9,061 | $ 10,415 | $ 10,886
Depreciation and Amortization |  |  |  |  |  |  |  |  |  | 1,476 | 1,214 | 1,227
Operating Income (Loss) |  | (175) | $ 577 | $ 347 | $ 827 | 532 | $ 814 | $ 568 | $ 1,048 | 1,576 | 2,962 | 2,623
Income from Equity Method Investments |  |  |  |  |  |  |  |  |  | 11 | 12 | 13
Interest Income |  |  |  |  |  |  |  |  |  | 30 | 31 | 30
Interest Expense |  |  |  |  |  |  |  |  |  | (385) | (393) | (389)
Income (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  | 1,298 | 2,680 | 2,456
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | 411 | 1,001 | 938
Net Income (Loss) |  |  |  |  |  |  |  |  |  | 887 | 1,679 | 1,518
Gross Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  | 4,199 | 3,863 | 2,820
Total Assets |  | 40,070 |  |  |  | 37,535 |  |  |  | 40,070 | 37,535 | 35,287
Investments in Equity Method Subsidiaries |  | 102 |  |  |  | 119 |  |  |  | 102 | 119 | 123
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) |  |  |  |  |  |  |  |  |  | 887 | 1,679 | 1,518
Operating Segments [Member] | Power [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  | 4,023 | 4,928 | 5,434
Depreciation and Amortization |  |  |  |  |  |  |  |  |  | 881 | 291 | 292
Operating Income (Loss) |  |  |  |  |  |  |  |  |  | 13 | 1,430 | 1,209
Income from Equity Method Investments |  |  |  |  |  |  |  |  |  | 11 | 14 | 14
Interest Income |  |  |  |  |  |  |  |  |  | 4 | 2 | 1
Interest Expense |  |  |  |  |  |  |  |  |  | (84) | (121) | (122)
Income (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  | (43) | 1,367 | 1,251
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | (61) | 511 | 491
Net Income (Loss) |  |  |  |  |  |  |  |  |  | 18 | 856 | 760
Gross Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  | 1,343 | 1,117 | 626
Total Assets |  | 12,193 |  |  |  | 12,250 |  |  |  | 12,193 | 12,250 | 12,037
Investments in Equity Method Subsidiaries |  | 102 |  |  |  | 119 |  |  |  | 102 | 119 | 121
Operating Segments [Member] | PSE&G [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  | 6,221 | 6,636 | 6,766
Depreciation and Amortization |  |  |  |  |  |  |  |  |  | 565 | 892 | 906
Operating Income (Loss) |  |  |  |  |  |  |  |  |  | 1,614 | 1,462 | 1,393
Income from Equity Method Investments |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest Income |  |  |  |  |  |  |  |  |  | 24 | 25 | 26
Interest Expense |  |  |  |  |  |  |  |  |  | (289) | (280) | (277)
Income (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  | 1,404 | 1,257 | 1,174
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | 515 | 470 | 449
Net Income (Loss) |  |  |  |  |  |  |  |  |  | 889 | 787 | 725
Gross Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  | 2,816 | 2,692 | 2,164
Total Assets |  | 26,288 |  |  |  | 23,677 |  |  |  | 26,288 | 23,677 | 22,186
Investments in Equity Method Subsidiaries |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Operating Segments [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | [1] |  |  |  |  |  |  |  |  | 370 | 462 | 455
Depreciation and Amortization | [1] |  |  |  |  |  |  |  |  | 30 | 31 | 29
Operating Income (Loss) | [1] |  |  |  |  |  |  |  |  | (51) | 70 | 21
Income from Equity Method Investments | [1] |  |  |  |  |  |  |  |  | 0 | (2) | (1)
Interest Income | [1] |  |  |  |  |  |  |  |  | 4 | 33 | 25
Interest Expense | [1] |  |  |  |  |  |  |  |  | (14) | (21) | (12)
Income (Loss) before Income Taxes | [1] |  |  |  |  |  |  |  |  | (63) | 56 | 31
Income Tax Expense (Benefit) | [1] |  |  |  |  |  |  |  |  | (43) | 20 | (2)
Net Income (Loss) | [1] |  |  |  |  |  |  |  |  | (20) | 36 | 33
Gross Additions to Long-Lived Assets | [1] |  |  |  |  |  |  |  |  | 40 | 54 | 30
Total Assets | [1] | 2,373 |  |  |  | 2,810 |  |  |  | 2,373 | 2,810 | 2,799
Investments in Equity Method Subsidiaries | [1] | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 2
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | [2] |  |  |  |  |  |  |  |  | (1,553) | (1,611) | (1,769)
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) | (29) | (22)
Interest Expense | [2] |  |  |  |  |  |  |  |  | 2 | 29 | 22
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] | (784) |  |  |  | (1,202) |  |  |  | (784) | (1,202) | (1,735)
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. No gains or losses are recorded on any intercompany transactions; rather, all intercompany transactions are at cost or, in the case of the BGS and BGSS contracts between PSE&G and Power, at rates prescribed by the BPU. For a further discussion of the intercompany transactions between PSE&G and Power, see Note 24. Related-Party Transactions.

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