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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  | $ 2,278 |  | $ 2,688 | $ 2,314 | $ 3,135 | $ 2,773 |  | $ 2,641 | $ 2,249 | $ 3,223 | $ 10,415 |  | $ 10,886 |  | $ 9,968
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  | 1,214 |  | 1,227 |  | 1,178
Operating Income (Loss) |  | 532 |  | $ 814 | $ 568 | $ 1,048 | 807 |  | $ 746 | $ 365 | $ 705 | 2,962 |  | 2,623 |  | 2,299
Income from Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  | 12 |  | 13 |  | 11
Interest Income |  |  |  |  |  |  |  |  |  |  |  | 31 |  | 30 |  | 29
Interest Expense |  |  |  |  |  |  |  |  |  |  |  | (393) |  | (389) |  | (402)
Income (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  |  |  | 2,680 |  | 2,456 |  | 2,055
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  | 1,001 |  | 938 |  | 812
Net Income (Loss) |  |  |  |  |  |  |  |  |  |  |  | 1,679 |  | 1,518 |  | 1,243
Gross Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  | 3,863 |  | 2,820 |  | 2,811
Total Assets |  | 37,535 |  |  |  |  | 35,287 |  |  |  |  | 37,535 |  | 35,287 |  | 32,480
Investments in Equity Method Subsidiaries |  | 119 |  |  |  |  | 123 |  |  |  |  | 119 |  | 123 |  | 126
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) |  |  |  |  |  |  |  |  |  |  |  | 1,679 |  | 1,518 |  | 1,243
Operating Segments [Member] | Power [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  | 4,928 |  | 5,434 |  | 5,063
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  | 291 |  | 292 |  | 273
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  | 1,430 |  | 1,209 |  | 1,070
Income from Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  | 14 |  | 14 |  | 16
Interest Income |  |  |  |  |  |  |  |  |  |  |  | 2 |  | 1 |  | 1
Interest Expense |  |  |  |  |  |  |  |  |  |  |  | (121) |  | (122) |  | (116)
Income (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  |  |  | 1,367 |  | 1,251 |  | 1,063
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  | 511 |  | 491 |  | 419
Net Income (Loss) |  |  |  |  |  |  |  |  |  |  |  | 856 |  | 760 |  | 644
Gross Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  | 1,117 |  | 626 |  | 609
Total Assets |  | 12,250 |  |  |  |  | 12,037 |  |  |  |  | 12,250 |  | 12,037 |  | 11,991
Investments in Equity Method Subsidiaries |  | 119 |  |  |  |  | 121 |  |  |  |  | 119 |  | 121 |  | 123
Operating Segments [Member] | PSE&G [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  | 6,636 |  | 6,766 |  | 6,655
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  | 892 |  | 906 |  | 872
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  | 1,462 |  | 1,393 |  | 1,235
Income from Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0
Interest Income |  |  |  |  |  |  |  |  |  |  |  | 25 |  | 26 |  | 25
Interest Expense |  |  |  |  |  |  |  |  |  |  |  | (280) |  | (277) |  | (293)
Income (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  |  |  | 1,257 |  | 1,174 |  | 993
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  | 470 |  | 449 |  | 381
Net Income (Loss) |  |  |  |  |  |  |  |  |  |  |  | 787 |  | 725 |  | 612
Gross Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  | 2,692 |  | 2,164 |  | 2,175
Total Assets |  | 23,677 |  |  |  |  | 22,186 |  |  |  |  | 23,677 |  | 22,186 |  | 19,689
Investments in Equity Method Subsidiaries |  | 0 |  |  |  |  | 0 |  |  |  |  | 0 |  | 0 |  | 0
Operating Segments [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  | 462 |  | 455 |  | 52
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  | 31 |  | 29 |  | 33
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  | 70 |  | 21 |  | (6)
Income from Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  | (2) |  | (1) |  | (5)
Interest Income |  |  |  |  |  |  |  |  |  |  |  | 33 |  | 25 |  | 25
Interest Expense |  |  |  |  |  |  |  |  |  |  |  | (21) |  | (12) |  | (15)
Income (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  |  |  | 56 |  | 31 |  | (1)
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  | 20 |  | (2) |  | 12
Net Income (Loss) |  |  |  |  |  |  |  |  |  |  |  | 36 |  | 33 |  | (13)
Gross Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  | 54 |  | 30 |  | 27
Total Assets |  | 2,810 |  |  |  |  | 2,799 |  |  |  |  | 2,810 |  | 2,799 |  | 4,025
Investments in Equity Method Subsidiaries |  | 0 |  |  |  |  | 2 |  |  |  |  | 0 |  | 2 |  | 3
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | [1] |  |  |  |  |  |  |  |  |  |  | (1,611) |  | (1,769) |  | (1,802)
Depreciation and Amortization | [1] |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0
Operating Income (Loss) | [1] |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0
Income from Equity Method Investments | [1] |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0
Interest Income | [1] |  |  |  |  |  |  |  |  |  |  | (29) |  | (22) |  | (22)
Interest Expense | [1] |  |  |  |  |  |  |  |  |  |  | 29 |  | 22 |  | 22
Income (Loss) before Income Taxes | [1] |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0
Income Tax Expense (Benefit) | [1] |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0
Net Income (Loss) | [1] |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0
Gross Additions to Long-Lived Assets | [1] |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 0
Total Assets | [1] | (1,202) |  |  |  |  | (1,735) |  |  |  |  | (1,202) |  | (1,735) |  | (3,225)
Investments in Equity Method Subsidiaries |  | $ 0 | [1] |  |  |  | $ 0 | [1] |  |  |  | $ 0 | [1] | $ 0 | [1] | $ 0
[1] | B)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 23. Related-Party Transactions.

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