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Financial Risk Management Activities (Tables) | 9 Months Ended
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Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Schedule Of Derivative Instruments Fair Value In Balance Sheets | The following tabular disclosure does not include the offsetting of trade receivables and payables.
|  |  | As of September 30, 2017 |
|  |  | Power (A) |  | PSEG (A) |  | Consolidated |
|  |  | Not Designated |  |  |  |  |  | Designated as Hedges |  |  |
| Balance Sheet Location |  | Energy- Related Contracts |  | Netting (B) |  | Total Power |  | Interest Rate Swaps |  | Total Derivatives |
|  |  | Millions |
| Derivative Contracts |  |  |  |  |  |  |  |  |  |  |
| Current Assets |  | $ | 352 |  |  | $ | (268 | ) |  | $ | 84 |  |  | $ | — |  |  | $ | 84 |  |
| Noncurrent Assets |  | 178 |  |  | (116 | ) |  | 62 |  |  | — |  |  | 62 |  |
| Total Mark-to-Market Derivative Assets |  | $ | 530 |  |  | $ | (384 | ) |  | $ | 146 |  |  | $ | — |  |  | $ | 146 |  |
| Derivative Contracts |  |  |  |  |  |  |  |  |  |  |
| Current Liabilities |  | $ | (268 | ) |  | $ | 261 |  |  | $ | (7 | ) |  | $ | — |  |  | $ | (7 | ) |
| Noncurrent Liabilities |  | (110 | ) |  | 109 |  |  | (1 | ) |  | — |  |  | (1 | ) |
| Total Mark-to-Market Derivative (Liabilities) |  | $ | (378 | ) |  | $ | 370 |  |  | $ | (8 | ) |  | $ | — |  |  | $ | (8 | ) |
| Total Net Mark-to-Market Derivative Assets (Liabilities) |  | $ | 152 |  |  | $ | (14 | ) |  | $ | 138 |  |  | $ | — |  |  | $ | 138 |  |
|  |  | As of December 31, 2016 |
|  |  | Power (A) |  | PSE&G (A) |  | PSEG (A) |  | 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 |  | $ | 435 |  |  | $ | (273 | ) |  | $ | 162 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 163 |  |
| Noncurrent Assets |  | 122 |  |  | (98 | ) |  | 24 |  |  | — |  |  | — |  |  | 24 |  |
| Total Mark-to-Market Derivative Assets |  | $ | 557 |  |  | $ | (371 | ) |  | $ | 186 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 187 |  |
| Derivative Contracts |  |  |  |  |  |  |  |  |  |  |  |  |
| Current Liabilities |  | $ | (285 | ) |  | $ | 277 |  |  | $ | (8 | ) |  | $ | (5 | ) |  | $ | — |  |  | $ | (13 | ) |
| Noncurrent Liabilities |  | (98 | ) |  | 95 |  |  | (3 | ) |  | — |  |  | — |  |  | (3 | ) |
| Total Mark-to-Market Derivative (Liabilities) |  | $ | (383 | ) |  | $ | 372 |  |  | $ | (11 | ) |  | $ | (5 | ) |  | $ | — |  |  | $ | (16 | ) |
| Total Net Mark-to-Market Derivative Assets (Liabilities) |  | $ | 174 |  |  | $ | 1 |  |  | $ | 175 |  |  | $ | (5 | ) |  | $ | 1 |  |  | $ | 171 |  |
(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, 2017 and December 31, 2016. 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, 2017, net cash collateral (received) paid of $(14) million was netted against the corresponding net derivative contract positions. Of the $(14) million as of September 30, 2017, $(7) million was netted against current assets, and $(7) million was netted against noncurrent assets. As of December 31, 2016, net cash collateral (received) paid of $1 million was netted against the corresponding net derivative contract positions. Of the $1 million as of December 31, 2016, $(3) million was netted against noncurrent assets, and $4 million was netted against current liabilities.
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 and nine months ended September 30, 2017 and 2016.
| 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) |
|  | Three Months Ended |  |  |  | Three Months Ended |
|  | September 30, |  |  |  | September 30, |
|  | 2017 |  | 2016 |  |  |  | 2017 |  | 2016 |
|  |  | Millions |  |  |  | Millions |
| PSEG |  |  |  |  |  |  |  |  |  |  |
| Interest Rate Swaps |  | $ | 1 |  |  | $ | 1 |  |  | Interest Expense |  | $ | 2 |  |  | $ | — |  |
| Total PSEG |  | $ | 1 |  |  | $ | 1 |  |  |  |  | $ | 2 |  |  | $ | — |  |
| 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) |
|  | Nine Months Ended |  |  |  | Nine Months Ended |
|  | September 30, |  |  |  | September 30, |
|  | 2017 |  | 2016 |  |  |  | 2017 |  | 2016 |
|  |  | Millions |  |  |  | Millions |
| PSEG |  |  |  |  |  |  |  |  |  |  |
| Interest Rate Swaps |  | $ | 1 |  |  | $ | 3 |  |  | Interest Expense |  | $ | 2 |  |  | $ | — |  |
| Total PSEG |  | $ | 1 |  |  | $ | 3 |  |  |  |  | $ | 2 |  |  | $ | — |  |
There were no pre-tax gains (losses) recognized in income on derivatives (ineffective portion) as of September 30, 2017 and 2016.
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block] | The following reconciles the AOCI 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 |  | 3 |  |  | 2 |  |
| Less: Gain Reclassified into Income |  | — |  |  | — |  |
| Balance as of December 31, 2016 |  | $ | 3 |  |  | $ | 2 |  |
| Gain Recognized in AOCI |  | 1 |  |  | — |  |
| Less: Gain Reclassified into Income |  | (2 | ) |  | (1 | ) |
| Balance as of September 30, 2017 |  | $ | 2 |  |  | $ | 1 |  |
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 for the three months and nine months ended September 30, 2017 and 2016. Power’s derivative contracts reflected in this table include contracts to hedge the purchase and sale of electricity and natural gas, and the purchase of fuel. The table does not include contracts for which Power has designated as NPNS, such as its BGS contracts and certain other energy supply contracts that it has with other utilities and companies with retail load.
| 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, |
|  |  |  |  | 2017 |  | 2016 |  | 2017 |  | 2016 |
|  |  |  |  | Millions |
| PSEG and Power |  |  |  |  |  |  |  |  |  |  |
| Energy-Related Contracts |  | Operating Revenues |  | $ | 25 |  |  | $ | 125 |  |  | $ | 221 |  |  | $ | 255 |  |
| Energy-Related Contracts |  | Energy Costs |  | (3 | ) |  | (11 | ) |  | (19 | ) |  | (3 | ) |
| Total PSEG and Power |  |  |  | $ | 22 |  |  | $ | 114 |  |  | $ | 202 |  |  | $ | 252 |  |
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, 2017 and December 31, 2016.
| Type |  | Notional |  | Total |  | PSEG |  | Power |  | PSE&G |
|  |  |  |  | Millions |
| As of September 30, 2017 |  |  |  |  |  |  |  |  |  |  |
| Natural Gas |  | Dekatherm (Dth) |  | 265 |  |  | — |  |  | 265 |  |  | — |  |
| Electricity |  | MWh |  | 332 |  |  | — |  |  | 332 |  |  | — |  |
| Financial Transmission Rights (FTRs) |  | MWh |  | 5 |  |  | — |  |  | 5 |  |  | — |  |
| Interest Rate Swaps |  | U.S. Dollars |  | 500 |  |  | 500 |  |  | — |  |  | — |  |
| As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
| Natural Gas |  | Dth |  | 357 |  |  | — |  |  | 348 |  |  | 9 |  |
| Electricity |  | MWh |  | 323 |  |  | — |  |  | 323 |  |  | — |  |
| FTRs |  | MWh |  | 9 |  |  | — |  |  | 9 |  |  | — |  |
| Interest Rate Swaps |  | U.S. Dollars |  | 500 |  |  | 500 |  |  | — |  |  | — |  |
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, 2017. It further delineates that exposure by the credit rating of the counterparties, which is determined by the lowest rating from S&P, Moody’s or an internal scoring model. In addition, it 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 |  | Collateral Held |  | Net Exposure |  | Number of Counterparties >10% |  | Net Exposure of Counterparties >10% |  |
|  |  | Millions |  |  |  | Millions |  |
| Investment Grade |  | $ | 318 |  |  | $ | 55 |  |  | $ | 263 |  |  | 2 |  |  | $ | 128 |  | (A) |
| Non-Investment Grade |  | 5 |  |  | 1 |  |  | 4 |  |  | — |  |  | — |  |  |
| Total |  | $ | 323 |  |  | $ | 56 |  |  | $ | 267 |  |  | 2 |  |  | $ | 128 |  |  |
(A) | Includes net exposure of $97 million with PSE&G.
As of September 30, 2017, collateral held from counterparties where Power had credit exposure included $3 million in cash collateral and $53 million in letters of credit. As of September 30, 2017, Power had 144 active counterparties.

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