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Available-for-Sale Securities (Tables) | 9 Months Ended
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Sep. 30, 2016
Schedule of Available-for-sale Securities [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, 2016 |
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
|  | Millions |
| Equity Securities | $ | 691 |  |  | $ | 238 |  |  | $ | (7 | ) |  | $ | 922 |  |
| Debt Securities |  |  |  |  |  |  |  |
| Government Obligations | 509 |  |  | 21 |  |  | — |  |  | 530 |  |
| Other | 349 |  |  | 13 |  |  | (2 | ) |  | 360 |  |
| Total Debt Securities | 858 |  |  | 34 |  |  | (2 | ) |  | 890 |  |
| Other Securities | 45 |  |  | — |  |  | — |  |  | 45 |  |
| Total NDT Available-for-Sale Securities | $ | 1,594 |  |  | $ | 272 |  |  | $ | (9 | ) |  | $ | 1,857 |  |
|  | As of December 31, 2015 |
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
|  | Millions |
| Equity Securities | $ | 693 |  |  | $ | 185 |  |  | $ | (13 | ) |  | $ | 865 |  |
| Debt Securities |  |  |  |  |  |  |  |
| Government Obligations | 483 |  |  | 8 |  |  | (3 | ) |  | 488 |  |
| Other | 366 |  |  | 3 |  |  | (10 | ) |  | 359 |  |
| Total Debt Securities | 849 |  |  | 11 |  |  | (13 | ) |  | 847 |  |
| Other Securities | 42 |  |  | — |  |  | — |  |  | 42 |  |
| Total NDT Available-for-Sale Securities | $ | 1,584 |  |  | $ | 196 |  |  | $ | (26 | ) |  | $ | 1,754 |  |
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, 2016 |  | December 31, 2015 |
|  | Millions |
| Accounts Receivable | $ | 9 |  |  | $ | 17 |  |
| Accounts Payable | $ | 7 |  |  | $ | 10 |  |
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, 2016 |  | As of December 31, 2015 |
|  | 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) | $ | 101 |  |  | $ | (6 | ) |  | $ | 4 |  |  | $ | (1 | ) |  | $ | 151 |  |  | $ | (13 | ) |  | $ | 1 |  |  | $ | — |  |
| Debt Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Government Obligations (B) | 41 |  |  | — |  |  | 4 |  |  | — |  |  | 245 |  |  | (2 | ) |  | 19 |  |  | (1 | ) |
| Other (C) | 34 |  |  | — |  |  | 25 |  |  | (2 | ) |  | 222 |  |  | (7 | ) |  | 36 |  |  | (3 | ) |
| Total Debt Securities | 75 |  |  | — |  |  | 29 |  |  | (2 | ) |  | 467 |  |  | (9 | ) |  | 55 |  |  | (4 | ) |
| NDT Available-for-Sale Securities | $ | 176 |  |  | $ | (6 | ) |  | $ | 33 |  |  | $ | (3 | ) |  | $ | 618 |  |  | $ | (22 | ) |  | $ | 56 |  |  | $ | (4 | ) |
(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. 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, 2016.
(B) | Debt Securities (Government Obligations)—Unrealized losses on Power’s NDT investments in U.S. Treasury obligations and Federal Agency mortgage-backed securities were caused by interest rate changes. Since these investments are guaranteed by the U.S. government or an agency of the U.S. 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, 2016.
(C) | Debt Securities (Other)—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, 2016.
Proceeds From The Sales Of And The Net Realized Gains On Securities In The NDT Funds And Rabbi Trusts |
|  | Three Months Ended |  | Nine Months Ended |
|  | September 30, |  | September 30, |
|  | 2016 |  | 2015 |  | 2016 |  | 2015 |
|  | Millions |
| Proceeds from NDT Fund Sales (A) | $ | 139 |  |  | $ | 215 |  |  | $ | 470 |  |  | $ | 1,037 |  |
| Net Realized Gains (Losses) on NDT Fund: |  |  |  |  |  |  |  |
| Gross Realized Gains | $ | 11 |  |  | $ | 14 |  |  | $ | 36 |  |  | $ | 47 |  |
| Gross Realized Losses | (3 | ) |  | (11 | ) |  | (25 | ) |  | (24 | ) |
| Net Realized Gains (Losses) on NDT Fund | $ | 8 |  |  | $ | 3 |  |  | $ | 11 |  |  | $ | 23 |  |
(A) | 2015 proceeds include activity in accounts related to the liquidation of funds being transitioned to new managers
Amount Of Available-For-Sale Debt Securities By Maturity Periods | The NDT available-for-sale debt securities held as of September 30, 2016 had the following maturities:
| Time Frame |  | Fair Value |
|  |  | Millions |
| Less than one year |  | $ | 22 |  |
| 1 - 5 years |  | 233 |  |
| 6 - 10 years |  | 214 |  |
| 11 - 15 years |  | 56 |  |
| 16 - 20 years |  | 62 |  |
| Over 20 years |  | 303 |  |
| Total NDT Available-for-Sale Debt Securities | $ | 890 |  |
Rabbi Trust [Member] |
Schedule of Available-for-sale Securities [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 and greater than 12 months.
|  | As of September 30, 2016 |  | As of December 31, 2015 |
|  | 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) | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |
| Debt Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Government Obligations (B) | 4 |  |  | — |  |  | 1 |  |  | — |  |  | 53 |  |  | (1 | ) |  | 2 |  |  | — |  |
| Other (C) | 9 |  |  | — |  |  | 5 |  |  | — |  |  | 46 |  |  | (1 | ) |  | 9 |  |  | — |  |
| Total Debt Securities | 13 |  |  | — |  |  | 6 |  |  | — |  |  | 99 |  |  | (2 | ) |  | 11 |  |  | — |  |
| Rabbi Trust Available-for-Sale Securities | $ | 13 |  |  | $ | — |  |  | $ | 6 |  |  | $ | — |  |  | $ | 99 |  |  | $ | (2 | ) |  | $ | 11 |  |  | $ | — |  |
(A) | 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.
(B) | Debt Securities (Government Obligations)—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. Since these investments are guaranteed by the U.S. government or an agency of the U.S. 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, 2016.
(C) | Debt Securities (Other)—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, 2016.
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, 2016 |
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
|  | Millions |
| Equity Securities | $ | 11 |  |  | $ | 11 |  |  | $ | — |  |  | $ | 22 |  |
| Debt Securities |  |  |  |  |  |  |  |
| Government Obligations | 104 |  |  | 3 |  |  | — |  |  | 107 |  |
| Other | 91 |  |  | 3 |  |  | — |  |  | 94 |  |
| Total Debt Securities | 195 |  |  | 6 |  |  | — |  |  | 201 |  |
| Other Securities | 1 |  |  | — |  |  | — |  |  | 1 |  |
| Total Rabbi Trust Available-for-Sale Securities | $ | 207 |  |  | $ | 17 |  |  | $ | — |  |  | $ | 224 |  |
|  | As of December 31, 2015 |
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
|  | Millions |
| Equity Securities | $ | 12 |  |  | $ | 10 |  |  | $ | — |  |  | $ | 22 |  |
| Debt Securities |  |  |  |  |  |  |  |
| Government Obligations | 108 |  |  | 1 |  |  | (1 | ) |  | 108 |  |
| Other | 82 |  |  | — |  |  | (1 | ) |  | 81 |  |
| Total Debt Securities | 190 |  |  | 1 |  |  | (2 | ) |  | 189 |  |
| Other Securities | 2 |  |  | — |  |  | — |  |  | 2 |  |
| Total Rabbi Trust Available-for-Sale Securities | $ | 204 |  |  | $ | 11 |  |  | $ | (2 | ) |  | $ | 213 |  |
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, 2016 |  | December 31, 2015 |
|  | Millions |
| Accounts Receivable | $ | 1 |  |  | $ | 1 |  |
| Accounts Payable | $ | — |  |  | $ | — |  |
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 realized gains (losses) on securities in the Rabbi Trust Fund were:
|  | Three Months Ended |  | Nine Months Ended |
|  | September 30, |  | September 30, |
|  | 2016 |  | 2015 |  | 2016 |  | 2015 |
|  | Millions |
| Proceeds from Rabbi Trust Sales | $ | 20 |  |  | $ | 20 |  |  | $ | 81 |  |  | $ | 83 |  |
| Net Realized Gains (Losses) on Rabbi Trust: |  |  |  |  |  |  |  |
| Gross Realized Gains | $ | 2 |  |  | $ | — |  |  | $ | 5 |  |  | $ | 2 |  |
| Gross Realized Losses | (2 | ) |  | (1 | ) |  | (4 | ) |  | (1 | ) |
| Net Realized Gains (Losses) on Rabbi Trust | $ | — |  |  | $ | (1 | ) |  | $ | 1 |  |  | $ | 1 |  |
Amount Of Available-For-Sale Debt Securities By Maturity Periods | The Rabbi Trust available-for-sale debt securities held as of September 30, 2016 had the following maturities:
| Time Frame |  | Fair Value |
|  |  | Millions |
| Less than one year |  | $ | 9 |  |
| 1 - 5 years |  | 42 |  |
| 6 - 10 years |  | 48 |  |
| 11 - 15 years |  | 9 |  |
| 16 - 20 years |  | 9 |  |
| Over 20 years |  | 84 |  |
| Total Rabbi Trust Available-for-Sale Debt Securities | $ | 201 |  |
Fair Value Of The Rabbi Trusts | The fair value of assets in the Rabbi Trust related to PSEG, PSE&G and Power are detailed as follows:
|  | As of |  | As of |
|  | September 30, 2016 |  | December 31, 2015 |
|  | Millions |
| PSE&G | $ | 44 |  |  | $ | 42 |  |
| Power | 55 |  |  | 52 |  |
| Other | 125 |  |  | 119 |  |
| Total Rabbi Trust Available-for-Sale Securities | $ | 224 |  |  | $ | 213 |  |

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