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Trust Investments (Tables) | 9 Months Ended
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Sep. 30, 2018
Schedule of Trust Investments [Line Items] |
Fair Values And Gross Unrealized Gains And Losses For The Securities Held In The NDT Fund | The following tables show the fair values and gross unrealized gains and losses for the securities held in the NDT Fund.
|  | As of September 30, 2018 |
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
|  | Millions |
| Equity Securities |  |  |  |  |  |  |  |
| Domestic | $ | 467 |  |  | $ | 268 |  |  | $ | (7 | ) |  | $ | 728 |  |
| International | 330 |  |  | 78 |  |  | (16 | ) |  | 392 |  |
| Total Equity Securities | 797 |  |  | 346 |  |  | (23 | ) |  | 1,120 |  |
| Available-for Sale Debt Securities |  |  |  |  |  |  |  |
| Government | 537 |  |  | — |  |  | (17 | ) |  | 520 |  |
| Corporate | 468 |  |  | 1 |  |  | (13 | ) |  | 456 |  |
| Total Available-for-Sale Debt Securities | 1,005 |  |  | 1 |  |  | (30 | ) |  | 976 |  |
| Other | — |  |  | — |  |  | — |  |  | — |  |
| Total NDT Fund Investments | $ | 1,802 |  |  | $ | 347 |  |  | $ | (53 | ) |  | $ | 2,096 |  |
|  | As of December 31, 2017 |
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
|  | Millions |
| Equity Securities |  |  |  |  |  |  |  |
| Domestic | $ | 497 |  |  | $ | 245 |  |  | $ | (2 | ) |  | $ | 740 |  |
| International | 311 |  |  | 99 |  |  | (3 | ) |  | 407 |  |
| Total Equity Securities | 808 |  |  | 344 |  |  | (5 | ) |  | 1,147 |  |
| Available-for Sale Debt Securities |  |  |  |  |  |  |  |
| Government | 586 |  |  | 2 |  |  | (4 | ) |  | 584 |  |
| Corporate | 400 |  |  | 4 |  |  | (2 | ) |  | 402 |  |
| Total Available-for-Sale Debt Securities | 986 |  |  | 6 |  |  | (6 | ) |  | 986 |  |
| Total NDT Fund Investments | $ | 1,794 |  |  | $ | 350 |  |  | $ | (11 | ) |  | $ | 2,133 |  |
Schedule Of Accounts Receivable And Accounts Payable in the NDT Funds | The amounts in the preceding tables do not include receivables and payables for NDT Fund transactions which have not settled at the end of each period. Such amounts are included in Accounts Receivable and Accounts Payable on the Condensed Consolidated Balance Sheets as shown in the following table.
|  | As of |  | As of |
|  | September 30, 2018 |  | December 31, 2017 |
|  | Millions |
| Accounts Receivable | $ | 13 |  |  | $ | 24 |  |
| Accounts Payable | $ | 14 |  |  | $ | 74 |  |
Value Of Securities That Have Been In An Unrealized Loss Position For Less Than And Greater Than 12 Months | The following table shows the value of securities in the NDT Fund that have been in an unrealized loss position for less than and greater than 12 months.
|  | As of September 30, 2018 |  | As of December 31, 2017 |
|  | Less Than 12 Months |  | Greater Than 12 Months |  | Less Than 12 Months |  | Greater Than 12 Months |
|  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |
|  | Millions |
| Equity Securities (A) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Domestic | $ | 78 |  |  | $ | (7 | ) |  | $ | 4 |  |  | $ | — |  |  | $ | 40 |  |  | $ | (2 | ) |  | $ | — |  |  | $ | — |  |
| International | 87 |  |  | (14 | ) |  | 8 |  |  | (2 | ) |  | 29 |  |  | (3 | ) |  | 2 |  |  | — |  |
| Total Equity Securities | 165 |  |  | (21 | ) |  | 12 |  |  | (2 | ) |  | 69 |  |  | (5 | ) |  | 2 |  |  | — |  |
| Available-for Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Government (B) | 342 |  |  | (10 | ) |  | 153 |  |  | (7 | ) |  | 343 |  |  | (2 | ) |  | 91 |  |  | (2 | ) |
| Corporate (C) | 342 |  |  | (11 | ) |  | 49 |  |  | (2 | ) |  | 191 |  |  | (1 | ) |  | 27 |  |  | (1 | ) |
| Total Available-for-Sale Debt Securities | 684 |  |  | (21 | ) |  | 202 |  |  | (9 | ) |  | 534 |  |  | (3 | ) |  | 118 |  |  | (3 | ) |
| NDT Trust Investments | $ | 849 |  |  | $ | (42 | ) |  | $ | 214 |  |  | $ | (11 | ) |  | $ | 603 |  |  | $ | (8 | ) |  | $ | 120 |  |  | $ | (3 | ) |
(A) | 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.
(B) | 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.
(C) | 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.
Proceeds From The Sales Of And The Net Realized Gains On Securities In The NDT Funds And Rabbi Trusts | The proceeds from the sales of and the net gains (losses) on securities in the NDT Fund were:
|  | Three Months Ended |  | Nine Months Ended |
|  | September 30, |  | September 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
|  | Millions |
| Proceeds from NDT Fund Sales (A) | $ | 231 |  |  | $ | 278 |  |  | $ | 1,005 |  |  | $ | 845 |  |
| Net Realized Gains (Losses) on NDT Fund |  |  |  |  |  |  |  |
| Gross Realized Gains | $ | 17 |  |  | $ | 29 |  |  | $ | 75 |  |  | $ | 82 |  |
| Gross Realized Losses | (7 | ) |  | (5 | ) |  | (29 | ) |  | (14 | ) |
| Net Realized Gains (Losses) on NDT Fund (B) | $ | 10 |  |  | $ | 24 |  |  | $ | 46 |  |  | $ | 68 |  |
| Unrealized Gains (Losses) on Equity Securities in NDT Fund (C) | 34 |  |  | N/A |  |  | (16 | ) |  | N/A |  |
| Other-Than-Temporary-Impairments (OTTI) | $ | — |  |  | $ | (5 | ) |  | — |  |  | (9 | ) |
| Net Gains (Losses) on NDT Fund Investments | $ | 44 |  |  | $ | 19 |  |  | $ | 30 |  |  | $ | 59 |  |
(A)Includes activity in accounts related to the liquidation of funds being transitioned to new managers. (B)The cost of these securities was determined on the basis of specific identification.
(C) | Effective January 1, 2018, unrealized gains (losses) on equity securities are recorded in Net Income instead of Other Comprehensive Income (Loss).
Amount Of Available-For-Sale Debt Securities By Maturity Periods | The NDT Fund debt securities held as of September 30, 2018 had the following maturities:
| Time Frame |  | Fair Value |
|  |  | Millions |
| Less than one year |  | $ | 11 |  |
| 1 - 5 years |  | 282 |  |
| 6 - 10 years |  | 201 |  |
| 11 - 15 years |  | 47 |  |
| 16 - 20 years |  | 73 |  |
| Over 20 years |  | 362 |  |
| Total NDT Available-for-Sale Debt Securities | $ | 976 |  |
Rabbi Trust [Member] |
Schedule of Trust Investments [Line Items] |
Value Of Securities That Have Been In An Unrealized Loss Position For Less Than And Greater Than 12 Months | The following table shows the value of securities in the Rabbi Trust Fund that have been in an unrealized loss position for less than 12 months and greater than 12 months.
|  | As of September 30, 2018 |  | As of December 31, 2017 |
|  | Less Than 12 Months |  | Greater Than 12 Months |  | Less Than 12 Months |  | Greater Than 12 Months |
|  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |
|  | Millions |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Government (A) | $ | 70 |  |  | $ | (2 | ) |  | $ | 28 |  |  | $ | (2 | ) |  | $ | 28 |  |  | $ | — |  |  | $ | 25 |  |  | $ | (1 | ) |
| Corporate (B) | 76 |  |  | (3 | ) |  | 14 |  |  | — |  |  | 39 |  |  | (1 | ) |  | 9 |  |  | — |  |
| Total Available-for-Sale Debt Securities | 146 |  |  | (5 | ) |  | 42 |  |  | (2 | ) |  | 67 |  |  | (1 | ) |  | 34 |  |  | (1 | ) |
| Rabbi Trust Investments | $ | 146 |  |  | $ | (5 | ) |  | $ | 42 |  |  | $ | (2 | ) |  | $ | 67 |  |  | $ | (1 | ) |  | $ | 34 |  |  | $ | (1 | ) |
(A) | 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.
(B) | 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.
Securities Held In The Rabbi Trusts | The following tables show the fair values, gross unrealized gains and losses and amortized cost basis for the securities held in the Rabbi Trust.
|  | As of September 30, 2018 |
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
|  | Millions |
| Equity Securities |  |  |  |  |  |  |  |
| Domestic | $ | 21 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 25 |  |
| International | — |  |  | — |  |  | — |  |  | — |  |
| Total Equity Securities | 21 |  |  | 4 |  |  | — |  |  | 25 |  |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |
| Government | 103 |  |  | — |  |  | (4 | ) |  | 99 |  |
| Corporate | 104 |  |  | — |  |  | (3 | ) |  | 101 |  |
| Total Available-for-Sale Debt Securities | 207 |  |  | — |  |  | (7 | ) |  | 200 |  |
| Total Rabbi Trust Investments | $ | 228 |  |  | $ | 4 |  |  | $ | (7 | ) |  | $ | 225 |  |
|  | As of December 31, 2017 |
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
|  | Millions |
| Equity Securities |  |  |  |  |  |  |  |
| Domestic | $ | 24 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 27 |  |
| International | — |  |  | — |  |  | — |  |  | — |  |
| Total Equity Securities | 24 |  |  | 3 |  |  | — |  |  | 27 |  |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |
| Government | 85 |  |  | 1 |  |  | (1 | ) |  | 85 |  |
| Corporate | 118 |  |  | 2 |  |  | (1 | ) |  | 119 |  |
| Total Available-for-Sale Debt Securities | 203 |  |  | 3 |  |  | (2 | ) |  | 204 |  |
| Total Rabbi Trust Investments | $ | 227 |  |  | $ | 6 |  |  | $ | (2 | ) |  | $ | 231 |  |
Schedule of Accounts Receivable and Accounts Payable in the Rabbi Trust Funds [Table Text Block] | The amounts in the preceding tables do not include receivables and payables for Rabbi Trust Fund transactions which have not settled at the end of each period. Such amounts are included in Accounts Receivable and Accounts Payable on the Condensed Consolidated Balance Sheets as shown in the following table.
|  | As of |  | As of |
|  | September 30, 2018 |  | December 31, 2017 |
|  | Millions |
| Accounts Receivable | $ | 1 |  |  | $ | 2 |  |
| Accounts Payable | $ | — |  |  | $ | 1 |  |
Proceeds From The Sales Of And The Net Realized Gains On Securities In The NDT Funds And Rabbi Trusts | The proceeds from the sales of and the net gains (losses) on securities in the Rabbi Trust Fund were:
|  | Three Months Ended |  | Nine Months Ended |
|  | September 30, |  | September 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
|  | Millions |
| Proceeds from Rabbi Trust Sales (A) | $ | 33 |  |  | $ | 24 |  |  | $ | 80 |  |  | $ | 168 |  |
| Net Realized Gains (Losses) on Rabbi Trust: |  |  |  |  |  |  |  |
| Gross Realized Gains | $ | — |  |  | $ | — |  |  | $ | 2 |  |  | $ | 17 |  |
| Gross Realized Losses | (1 | ) |  | (1 | ) |  | (3 | ) |  | (5 | ) |
| Net Realized Gains (Losses) on Rabbi Trust (B) | (1 | ) |  | (1 | ) |  | (1 | ) |  | 12 |  |
| Unrealized Gains (Losses) on Equity Securities in Rabbi Trust (C) | 2 |  |  | N/A |  |  | 2 |  |  | N/A |  |
| OTTI | — |  |  | — |  |  | — |  |  | — |  |
| Net Gains (Losses) on Rabbi Trust Investments | $ | 1 |  |  | $ | (1 | ) |  | $ | 1 |  |  | $ | 12 |  |
(A)Includes activity in accounts related to the liquidation of funds being transitioned to new managers. (B)The cost of these securities was determined on the basis of specific identification.
(C) | Effective January 1, 2018, unrealized gains (losses) on equity securities are recorded in Net Income instead of Other Comprehensive Income (Loss).
Amount Of Available-For-Sale Debt Securities By Maturity Periods | The Rabbi Trust debt securities held as of September 30, 2018 had the following maturities:
| Time Frame |  | Fair Value |
|  |  | Millions |
| Less than one year |  | $ | 3 |  |
| 1 - 5 years |  | 28 |  |
| 6 - 10 years |  | 32 |  |
| 11 - 15 years |  | 7 |  |
| 16 - 20 years |  | 22 |  |
| Over 20 years |  | 108 |  |
| Total Rabbi Trust Available-for-Sale Debt Securities | $ | 200 |  |
Fair Value Of The Rabbi Trusts | The fair value of the Rabbi Trust related to PSEG, PSE&G and Power are detailed as follows:
|  | As of |  | As of |
|  | September 30, 2018 |  | December 31, 2017 |
|  | Millions |
| PSE&G | $ | 46 |  |  | $ | 46 |  |
| Power | 57 |  |  | 57 |  |
| Other | 122 |  |  | 128 |  |
| Total Rabbi Trust Investments | $ | 225 |  |  | $ | 231 |  |

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