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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.