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Trust Investments (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, 2018 | Dec. 31, 2017
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Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value |  | $ 849 | $ 603
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses |  | (42) | (8)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value |  | 214 | 120
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses |  | (11) | (3)
Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value |  | 146 | 67
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses |  | (5) | (1)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value |  | 42 | 34
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses |  | (2) | (1)
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | [1] | 78 | 40
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | [1] | (7) | (2)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value | [1] | 4 | 0
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses | [1] | 0 | 0
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | [1] | 87 | 29
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | [1] | (14) | (3)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value | [1] | 8 | 2
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses | [1] | (2) | 0
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | [1] | 165 | 69
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | [1] | (21) | (5)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value | [1] | 12 | 2
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses | [1] | (2) | 0
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | [2] | 342 | 343
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | [2] | (10) | (2)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value | [2] | 153 | 91
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses | [2] | (7) | (2)
Government Debt Securities [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | [3] | 70 | 28
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | [3] | (2) | 0
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value | [3] | 28 | 25
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses | [3] | (2) | (1)
Corporate Debt Obligations [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | [4] | 342 | 191
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | [4] | (11) | (1)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value | [4] | 49 | 27
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses | [4] | (2) | (1)
Corporate Debt Obligations [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value | [5] | 76 | 39
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses | [5] | (3) | (1)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value | [5] | 14 | 9
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses | [5] | 0 | 0
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value |  | 684 | 534
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses |  | (21) | (3)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value |  | 202 | 118
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses |  | (9) | (3)
Total Debt Securities [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value |  | 146 | 67
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses |  | (5) | (1)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value |  | 42 | 34
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses |  | $ (2) | $ (1)
[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. Effective January 1, 2018, unrealized gains and losses on these securities are recorded in Net Income.
[2] | Debt Securities (Government)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). The unrealized losses on Power’s NDT investments in U.S. Treasury obligations and Federal Agency mortgage-backed securities were caused by interest rate changes. These investments are guaranteed by the U.S. government or an agency of the U.S. government. Power also has investments in municipal bonds that are primarily in investment grade securities. It is not expected that these securities will 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, 2018.
[3] | Debt Securities (Government)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). The unrealized losses on PSEG’s Rabbi Trust investments in U.S. Treasury obligations and Federal Agency mortgage-backed securities were caused by interest rate changes. These investments are guaranteed by the U.S. government or an agency of the U.S. government. PSEG also has investments in municipal bonds that are primarily in investment grade securities. It is not expected that these securities will 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, 2018.
[4] | Debt Securities (Corporate)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). Power’s investments in corporate bonds are primarily in 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, 2018.
[5] | Debt Securities (Corporate)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). PSEG’s investments in corporate bonds are primarily in 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, 2018.

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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=82897076&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=82897076&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=82897076&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=82897076&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=82897076&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=82897076&loc=d3e27290-111563 + Details
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