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Financial Risk Management Activities (Tables) | 9 Months Ended
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Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Schedule Of Derivative Instruments Fair Value In Balance Sheets |
|  |  | As of September 30, 2016 (A) |
|  |  | Power |  | PSE&G |  | PSEG |  | Consolidated |
|  |  | Not Designated |  |  |  |  |  | Not Designated |  | Designated as Hedges |  |  |
| Balance Sheet Location |  | Energy- Related Contracts |  | Netting (B) |  | Total Power |  | Energy- Related Contracts |  | Interest Rate Swaps |  | Total Derivatives |
|  |  | Millions |
| Derivative Contracts |  |  |  |  |  |  |  |  |  |  |  |  |
| Current Assets |  | $ | 432 |  |  | $ | (283 | ) |  | $ | 149 |  |  | $ | — |  |  | $ | — |  |  | $ | 149 |  |
| Noncurrent Assets |  | 305 |  |  | (219 | ) |  | 86 |  |  | — |  |  | — |  |  | 86 |  |
| Total Mark-to-Market Derivative Assets |  | $ | 737 |  |  | $ | (502 | ) |  | $ | 235 |  |  | $ | — |  |  | $ | — |  |  | $ | 235 |  |
| Derivative Contracts |  |  |  |  |  |  |  |  |  |  |  |  |
| Current Liabilities |  | $ | (314 | ) |  | $ | 278 |  |  | $ | (36 | ) |  | $ | (4 | ) |  | $ | — |  |  | $ | (40 | ) |
| Noncurrent Liabilities |  | (219 | ) |  | 206 |  |  | (13 | ) |  | — |  |  | — |  |  | (13 | ) |
| Total Mark-to-Market Derivative (Liabilities) |  | $ | (533 | ) |  | $ | 484 |  |  | $ | (49 | ) |  | $ | (4 | ) |  | $ | — |  |  | $ | (53 | ) |
| Total Net Mark-to-Market Derivative Assets (Liabilities) |  | $ | 204 |  |  | $ | (18 | ) |  | $ | 186 |  |  | $ | (4 | ) |  | $ | — |  |  | $ | 182 |  |
|  |  | As of December 31, 2015 (A) |
|  |  | Power |  | PSE&G |  | PSEG |  | Consolidated |
|  |  | Not Designated |  |  |  |  |  | Not Designated |  | Designated as Hedges |  |  |
| Balance Sheet Location |  | Energy- Related Contracts |  | Netting (B) |  | Total Power |  | Energy- Related Contracts |  | Interest Rate Swaps |  | Total Derivatives |
|  |  | Millions |
| Derivative Contracts |  |  |  |  |  |  |  |  |  |  |  |  |
| Current Assets |  | $ | 700 |  |  | $ | (477 | ) |  | $ | 223 |  |  | $ | 13 |  |  | $ | 6 |  |  | $ | 242 |  |
| Noncurrent Assets |  | 208 |  |  | (131 | ) |  | 77 |  |  | — |  |  | — |  |  | 77 |  |
| Total Mark-to-Market Derivative Assets |  | $ | 908 |  |  | $ | (608 | ) |  | $ | 300 |  |  | $ | 13 |  |  | $ | 6 |  |  | $ | 319 |  |
| Derivative Contracts |  |  |  |  |  |  |  |  |  |  |  |  |
| Current Liabilities |  | $ | (513 | ) |  | $ | 437 |  |  | $ | (76 | ) |  | $ | — |  |  | $ | — |  |  | $ | (76 | ) |
| Noncurrent Liabilities |  | (132 | ) |  | 116 |  |  | (16 | ) |  | (11 | ) |  | — |  |  | (27 | ) |
| Total Mark-to-Market Derivative (Liabilities) |  | $ | (645 | ) |  | $ | 553 |  |  | $ | (92 | ) |  | $ | (11 | ) |  | $ | — |  |  | $ | (103 | ) |
| Total Net Mark-to-Market Derivative Assets (Liabilities) |  | $ | 263 |  |  | $ | (55 | ) |  | $ | 208 |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | 216 |  |
(A) | Substantially all of Power’s and PSEG’s derivative instruments are contracts subject to master netting agreements. Contracts not subject to master netting or similar agreements are immaterial and did not have any collateral posted or received as of September 30, 2016 and December 31, 2015. PSE&G does not have any derivative contracts subject to master netting or similar agreements.
(B) | Represents the netting of fair value balances with the same counterparty (where the right of offset exists) and the application of collateral. All cash collateral received or posted that has been allocated to derivative positions, where the right of offset exists, has been offset on the Condensed Consolidated Balance Sheets. As of September 30, 2016 and December 31, 2015, net cash collateral (received) paid of $(18) million and $(55) million, respectively, were netted against the corresponding net derivative contract positions. Of the $(18) million as of September 30, 2016, $(13) million and $(14) million of cash collateral were netted against current assets and noncurrent assets, respectively, and $9 million was netted against current liabilities. Of the $(55) million as of December 31, 2015, $(53) million and $(16) million were netted against current assets and noncurrent assets, respectively, and $12 million and $2 million were netted against current liabilities and noncurrent liabilities, respectively.
Schedule Of Derivative Instruments Designated As Cash Flow Hedges | The following shows the effect on the Condensed Consolidated Statements of Operations and on Accumulated Other Comprehensive Income (AOCI) of derivative instruments designated as cash flow hedges for the three months ended September 30, 2016 and 2015.
| Derivatives in Cash Flow Hedging Relationships |  | Amount of Pre-Tax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) |  | Location of Pre-Tax Gain (Loss) Reclassified from AOCI into Income |  | Amount of Pre-Tax Gain (Loss) Reclassified from AOCI into Income (Effective Portion) |  | Location of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) |  | Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) |
|  | Three Months Ended |  |  |  | Three Months Ended |  |  |  | Three Months Ended |
|  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | 2016 |  | 2015 |  |  |  | 2016 |  | 2015 |  |  |  | 2016 |  | 2015 |
|  |  | Millions |
| PSEG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Energy-Related Contracts |  | $ | — |  |  | $ | 1 |  |  | Operating Revenues |  | $ | — |  |  | $ | — |  |  | Operating Revenues |  | $ | — |  |  | $ | — |  |
| Interest Rate Swaps |  | 1 |  |  | — |  |  | Interest Expense |  | — |  |  | — |  |  | Interest Expense |  | — |  |  | — |  |
| Total PSEG |  | $ | 1 |  |  | $ | 1 |  |  |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | — |  |
| Power |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Energy-Related Contracts |  | $ | — |  |  | $ | 1 |  |  | Operating Revenues |  | $ | — |  |  | $ | — |  |  | Operating Revenues |  | $ | — |  |  | $ | — |  |
| Total Power |  | $ | — |  |  | $ | 1 |  |  |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | — |  |
The following shows the effect on the Condensed Consolidated Statements of Operations and on Accumulated Other Comprehensive Income (AOCI) of derivative instruments designated as cash flow hedges for the nine months ended September 30, 2016 and 2015.
| Derivatives in Cash Flow Hedging Relationships |  | Amount of Pre-Tax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) |  | Location of Pre-Tax Gain (Loss) Reclassified from AOCI into Income |  | Amount of Pre-Tax Gain (Loss) Reclassified from AOCI into Income (Effective Portion) |  | Location of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) |  | Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) |
|  | Nine Months Ended |  |  |  | Nine Months Ended |  |  |  | Nine Months Ended |
|  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | 2016 |  | 2015 |  |  |  | 2016 |  | 2015 |  |  |  | 2016 |  | 2015 |
|  |  | Millions |
| PSEG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Energy-Related Contracts |  | $ | — |  |  | $ | 2 |  |  | Operating Revenues |  | $ | — |  |  | $ | 17 |  |  | Operating Revenues |  | $ | — |  |  | $ | — |  |
| Interest Rate Swaps |  | 3 |  |  | — |  |  | Interest Expense |  | — |  |  | — |  |  | Interest Expense |  | — |  |  | — |  |
| Total PSEG |  | $ | 3 |  |  | $ | 2 |  |  |  |  | $ | — |  |  | $ | 17 |  |  |  |  | $ | — |  |  | $ | — |  |
| Power |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Energy-Related Contracts |  | $ | — |  |  | $ | 2 |  |  | Operating Revenues |  | $ | — |  |  | $ | 17 |  |  | Operating Revenues |  | $ | — |  |  | $ | — |  |
| Total Power |  | $ | — |  |  | $ | 2 |  |  |  |  | $ | — |  |  | $ | 17 |  |  |  |  | $ | — |  |  | $ | — |  |
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block] | The following reconciles the Accumulated Other Comprehensive Income for derivative activity included in the Accumulated Other Comprehensive Loss of PSEG on a pre-tax and after-tax basis.
| Accumulated Other Comprehensive Income |  | Pre-Tax |  | After-Tax |
|  |  | Millions |
| Balance as of December 31, 2015 |  | $ | — |  |  | $ | — |  |
| Gain Recognized in AOCI |  | 2 |  | — |  | 1 |  |
| Less: Gain Reclassified into Income |  | — |  |  | — |  |
| Balance as of June 30, 2016 |  | $ | 2 |  |  | $ | 1 |  |
| Gain Recognized in AOCI |  | 1 |  |  | 1 |  |
| Less: Gain Reclassified into Income |  | — |  |  | — |  |
| Balance as of September 30, 2016 |  | $ | 3 |  |  | $ | 2 |  |
Schedule Of Derivative Instruments Not Designated As Hedging Instruments And Impact On Results Of Operations | The following shows the effect on the Condensed Consolidated Statements of Operations of derivative instruments not designated as hedging instruments or as NPNS, such as its BGS contracts and certain other energy supply contracts, for the three months and nine months ended September 30, 2016 and 2015. Power’s derivative contracts reflected in these tables include contracts to hedge the purchase and sale of electricity and natural gas, and the purchase of fuel.
| Derivatives Not Designated as Hedges |  | Location of Pre-Tax Gain (Loss) Recognized in Income on Derivatives |  | Pre-Tax Gain (Loss) Recognized in Income on Derivatives |
|  |  |  |  | Three Months Ended |  | Nine Months Ended |
|  |  |  |  | September 30, |  | September 30, |
|  |  |  |  | 2016 |  | 2015 |  | 2016 |  | 2015 |
|  |  |  |  | Millions |
| PSEG and Power |  |  |  |  |  |  |  |  |  |  |
| Energy-Related Contracts |  | Operating Revenues |  | $ | 125 |  |  | $ | 154 |  |  | $ | 255 |  |  | $ | 202 |  |
| Energy-Related Contracts |  | Energy Costs |  | (11 | ) |  | (4 | ) |  | (3 | ) |  | (4 | ) |
| Total PSEG and Power |  |  |  | $ | 114 |  |  | $ | 150 |  |  | $ | 252 |  |  | $ | 198 |  |
Schedule Of Gross Volume, On Absolute Value Basis For Derivative Contracts | The following reflects the gross volume, on an absolute value basis, of derivatives as of September 30, 2016 and December 31, 2015.
| Type |  | Notional |  | Total |  | PSEG |  | Power |  | PSE&G |
|  |  |  |  | Millions |
| As of September 30, 2016 |  |  |  |  |  |  |  |  |  |  |
| Natural Gas |  | Dekatherm (Dth) |  | 315 |  |  | — |  |  | 300 |  |  | 15 |  |
| Electricity |  | MWh |  | 349 |  |  | — |  |  | 349 |  |  | — |  |
| Financial Transmission Rights (FTRs) |  | MWh |  | 14 |  |  | — |  |  | 14 |  |  | — |  |
| Interest Rate Swaps |  | U.S. Dollars |  | 500 |  |  | 500 |  |  | — |  |  | — |  |
| As of December 31, 2015 |  |  |  |  |  |  |  |  |  |  |
| Natural Gas |  | Dth |  | 201 |  |  | — |  |  | 168 |  |  | 33 |  |
| Electricity |  | MWh |  | 299 |  |  | — |  |  | 299 |  |  | — |  |
| FTRs |  | MWh |  | 23 |  |  | — |  |  | 23 |  |  | — |  |
| Interest Rate Swaps |  | U.S. Dollars |  | 550 |  |  | 550 |  |  | — |  |  | — |  |
Power [Member] |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Schedule Providing Credit Risk From Others, Net Of Collateral | The following table provides information on Power’s credit risk from others, net of collateral, as of September 30, 2016. It further delineates that exposure by the credit rating of the counterparties and provides guidance on the concentration of credit risk to individual counterparties and an indication of the quality of Power’s credit risk by credit rating of the counterparties.
| Rating |  | Current Exposure |  | Securities Held as Collateral |  | Net Exposure |  | Number of Counterparties >10% |  | Net Exposure of Counterparties >10% |  |
|  |  | Millions |  |  |  | Millions |  |
| Investment Grade—External Rating |  | $ | 384 |  |  | $ | 135 |  |  | $ | 249 |  |  | 2 |  |  | $ | 147 |  | (A) |
| Non-Investment Grade—External Rating |  | 24 |  |  | — |  |  | 24 |  |  | — |  |  | — |  |  |
| Investment Grade—No External Rating |  | 9 |  |  | — |  |  | 9 |  |  | — |  |  | — |  |  |
| Non-Investment Grade—No External Rating |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  |
| Total |  | $ | 418 |  |  | $ | 136 |  |  | $ | 282 |  |  | 2 |  |  | $ | 147 |  |  |
(A) | Represents net exposure of $114 million with PSE&G. The remaining net exposure of $33 million is with a non-affiliated power purchaser which is an investment grade counterparty.

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