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Available-For-Sale Securities (Value Of Securities That Have Been In An Unrealized Loss Position For Less Than And Greater Than 12 Months) (Detail) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
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Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value |  | $ 397 | $ 356
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses |  | (24) | (9)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value |  | 45 | 59
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses |  | (2) | (3)
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | [1] | 143 | 162
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | [1] | (18) | (8)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value | [1] | 1 | 1
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses | [1] | 0 | 0
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Government Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | [2] | 90 | 95
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | [2] | (1) | 0
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value | [2] | 15 | 28
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses | [2] | 0 | (1)
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Other Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | [3] | 164 | 99
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | [3] | (5) | (1)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value | [3] | 29 | 30
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses | [3] | (2) | (2)
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Total Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value |  | 254 | 194
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses |  | (6) | (1)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value |  | 44 | 58
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses |  | (2) | (3)
Rabbi Trust [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value |  | 88 | 26
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses |  | (3) | 0
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value |  | 11 | 0
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses |  | 0 | 0
Rabbi Trust [Member] | Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | [4] | 0 | 0
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | [4] | 0 | 0
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value | [4] | 0 | 0
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses | [4] | 0 | 0
Rabbi Trust [Member] | Government Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | [5] | 47 | 2
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | [5] | (2) | 0
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value | [5] | 2 | 0
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses | [5] | 0 | 0
Rabbi Trust [Member] | Other Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | [6] | 41 | 24
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | [6] | (1) | 0
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value | [6] | 9 | 0
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses | [6] | 0 | 0
Rabbi Trust [Member] | Total Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value |  | 88 | 26
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses |  | (3) | 0
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value |  | 11 | 0
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses |  | $ 0 | $ 0
[1] | Equity Securities—Investments in marketable equity securities within the NDT Fund are primarily in common stocks within a broad range of industries and sectors. The unrealized losses are distributed over a broad range of securities with limited impairment durations. Power does not consider these securities to be other-than-temporarily impaired as of September 30, 2015.
[2] | Debt Securities (Government)—Unrealized losses on Power’s NDT investments in United States Treasury obligations and Federal Agency mortgage-backed securities were caused by interest rate changes. Since these investments are guaranteed by the United States government or an agency of the United States government, it is not expected that these securities will settle for less than their amortized cost basis, since Power does not intend to sell nor will it be more-likely-than-not required to sell. Power does not consider these securities to be other-than-temporarily impaired as of September 30, 2015.
[3] | Debt Securities (Other)—Power’s investments in corporate bonds, collateralized mortgage obligations, asset-backed securities and municipal government obligations are limited to investment grade securities. It is not expected that these securities would settle for less than their amortized cost. Since Power does not intend to sell these securities nor will it be more-likely-than-not required to sell, Power does not consider these debt securities to be other-than-temporarily impaired as of September 30, 2015.
[4] | Equity Securities—Investments in marketable equity securities within the Rabbi Trust Fund are through a mutual fund which invests primarily in common stocks within a broad range of industries and sectors.
[5] | Debt Securities (Government)—Unrealized losses on PSEG’s Rabbi Trust investments in United States Treasury obligations and Federal Agency mortgage-backed securities were caused by interest rate changes. Since these investments are guaranteed by the United States government or an agency of the United States government, it is not expected that these securities will settle for less than their amortized cost basis, since PSEG does not intend to sell nor will it be more-likely-than-not required to sell. PSEG does not consider these securities to be other-than-temporarily impaired as of September 30, 2015.
[6] | Debt Securities (Other)—PSEG’s investments in corporate bonds, collateralized mortgage obligations, asset-backed securities and municipal government obligations are limited to investment grade securities. It is not expected that these securities would settle for less than their amortized cost. Since PSEG does not intend to sell these securities nor will it be more-likely-than-not required to sell, PSEG does not consider these debt securities to be other-than-temporarily impaired as of September 30, 2015.

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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