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Financial Risk Management Activities (Tables) | 3 Months Ended
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Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Schedule Of Derivative Instruments Fair Value In Balance Sheets |
|  |  | As of March 31, 2019 |
|  |  | Power (A) |  | PSEG (A) |  | Consolidated |
|  |  | Not Designated |  |  |  |  |  | Cash Flow Hedges |  |  |
| Balance Sheet Location |  | Energy- Related Contracts |  | Netting (B) |  | Total Power |  | Interest Rate Swaps |  | Total Derivatives |
|  |  | Millions |
| Derivative Contracts |  |  |  |  |  |  |  |  |  |  |
| Current Assets |  | $ | 346 |  |  | $ | (327 | ) |  | $ | 19 |  |  | $ | 1 |  |  | $ | 20 |  |
| Noncurrent Assets |  | 180 |  |  | (176 | ) |  | 4 |  |  | — |  |  | 4 |  |
| Total Mark-to-Market Derivative Assets |  | $ | 526 |  |  | $ | (503 | ) |  | $ | 23 |  |  | $ | 1 |  |  | $ | 24 |  |
| Derivative Contracts |  |  |  |  |  |  |  |  |  |  |
| Current Liabilities |  | $ | (396 | ) |  | $ | 383 |  |  | $ | (13 | ) |  | $ | — |  |  | $ | (13 | ) |
| Noncurrent Liabilities |  | (169 | ) |  | 168 |  |  | (1 | ) |  | (6 | ) |  | (7 | ) |
| Total Mark-to-Market Derivative (Liabilities) |  | $ | (565 | ) |  | $ | 551 |  |  | $ | (14 | ) |  | $ | (6 | ) |  | $ | (20 | ) |
| Total Net Mark-to-Market Derivative Assets (Liabilities) |  | $ | (39 | ) |  | $ | 48 |  |  | $ | 9 |  |  | $ | (5 | ) |  | $ | 4 |  |
|  |  | As of December 31, 2018 |
|  |  | Power (A) |  | Consolidated |
|  |  | Not Designated |  |  |  |  |  |  |
| Balance Sheet Location |  | Energy- Related Contracts |  | Netting (B) |  | Total Power |  | Total Derivatives |
|  |  | Millions |
| Derivative Contracts |  |  |  |  |  |  |  |  |
| Current Assets |  | $ | 426 |  |  | $ | (415 | ) |  | $ | 11 |  |  | $ | 11 |  |
| Noncurrent Assets |  | 137 |  |  | (136 | ) |  | 1 |  |  | 1 |  |
| Total Mark-to-Market Derivative Assets |  | $ | 563 |  |  | $ | (551 | ) |  | $ | 12 |  |  | $ | 12 |  |
| Derivative Contracts |  |  |  |  |  |  |  |  |
| Current Liabilities |  | $ | (521 | ) |  | $ | 510 |  |  | $ | (11 | ) |  | $ | (11 | ) |
| Noncurrent Liabilities |  | (198 | ) |  | 194 |  |  | (4 | ) |  | (4 | ) |
| Total Mark-to-Market Derivative (Liabilities) |  | $ | (719 | ) |  | $ | 704 |  |  | $ | (15 | ) |  | $ | (15 | ) |
| Total Net Mark-to-Market Derivative Assets (Liabilities) |  | $ | (156 | ) |  | $ | 153 |  |  | $ | (3 | ) |  | $ | (3 | ) |
(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 March 31, 2019 and December 31, 2018.
(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 March 31, 2019 and December 31, 2018, Power had net cash collateral/margin payments to counterparties of $203 million and $393 million, respectively. Of these net cash/collateral margin payments, $48 million as of March 31, 2019 and $153 million as December 31, 2018 were netted against the corresponding net derivative contract positions. Of the $48 million as of March 31, 2019, $(9) million was netted against noncurrent assets and $57 million was netted against current liabilities. Of the $153 million as of December 31, 2018, $(2) million was netted against current assets, $(3) million was netted against noncurrent assets, $96 million was netted against current liabilities and $62 million was netted against noncurrent liabilities.
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] | 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 March 31, 2019 and 2018:
| Derivatives in Cash Flow Hedging Relationships |  | Amount of Pre-Tax Gain (Loss) Recognized in AOCI on Derivatives |  | Location of Pre-Tax Gain (Loss) Reclassified from AOCI into Income |  | Amount of Pre-Tax Gain (Loss) Reclassified from AOCI into Income |
|  | Three Months Ended |  |  |  | Three Months Ended |
|  | March 31, |  |  |  | March 31, |
|  | 2019 |  | 2018 |  |  |  | 2019 |  | 2018 |
|  |  | Millions |  |  |  | Millions |
| PSEG |  |  |  |  |  |  |  |  |  |  |
| Interest Rate Swaps |  | $ | (5 | ) |  | $ | — |  |  | Interest Expense |  | $ | — |  |  | $ | — |  |
| Total PSEG |  | $ | (5 | ) |  | $ | — |  |  |  |  | $ | — |  |  | $ | — |  |
The effect of interest rate cash flow hedges is recorded in Interest Expense in PSEG’s Condensed Consolidated Statement of Operations. For the three months ended March 31, 2019 and 2018, the amount of gain or loss on interest rate hedges reclassified from Accumulated Other Comprehensive Income (Loss) into income was immaterial.
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block] | The following reconciles the Accumulated Other Comprehensive Income (Loss) for derivative activity included in the Accumulated Other Comprehensive Loss of PSEG on a pre-tax and after-tax basis.
| Accumulated Other Comprehensive Income (Loss) |  | Pre-Tax |  | After-Tax |
|  |  | Millions |
| Balance as of December 31, 2017 |  | $ | — |  |  | $ | — |  |
| Loss Recognized in AOCI |  | (2 | ) |  | (1 | ) |
| Less: Loss Reclassified into Income |  | — |  |  | — |  |
| Balance as of December 31, 2018 |  | $ | (2 | ) |  | $ | (1 | ) |
| Loss Recognized in AOCI |  | (5 | ) |  | (4 | ) |
| Less: Loss Reclassified into Income |  | — |  |  | — |  |
| Balance as of March 31, 2019 |  | $ | (7 | ) |  | $ | (5 | ) |
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 ended March 31, 2019 and 2018, respectively. 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 that 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 |
|  |  |  |  | March 31, |
|  |  |  |  | 2019 |  | 2018 |
|  |  |  | Millions |
| PSEG and Power |  |  |  |  |  |  |
| Energy-Related Contracts |  | Operating Revenues |  | $ | 139 |  |  | $ | 40 |  |
| Energy-Related Contracts |  | Energy Costs |  | (13 | ) |  | (8 | ) |
| Total PSEG and Power |  |  |  | $ | 126 |  |  | $ | 32 |  |
Schedule Of Gross Volume, On Absolute Value Basis For Derivative Contracts | The following table summarizes the net notional volume purchases/(sales) of open derivative transactions by commodity as of March 31, 2019 and December 31, 2018.
| Type |  | Notional |  | Total |  | PSEG |  | Power |  | PSE&G |
|  |  |  |  | Millions |
| As of March 31, 2019 |  |  |  |  |  |  |  |  |  |  |
| Natural Gas |  | Dekatherm (Dth) |  | 353 |  |  | — |  |  | 353 |  |  | — |  |
| Electricity |  | MWh |  | (61 | ) |  | — |  |  | (61 | ) |  | — |  |
| Financial Transmission Rights (FTRs) |  | MWh |  | 10 |  |  | — |  |  | 10 |  |  | — |  |
| Interest Rate Swaps |  | U.S. Dollars |  | 900 |  |  | 900 |  |  | — |  |  | — |  |
| As of December 31, 2018 |  |  |  |  |  |  |  |  |  |  |
| Natural Gas |  | Dth |  | 358 |  |  | — |  |  | 358 |  |  | — |  |
| Electricity |  | MWh |  | (74 | ) |  | — |  |  | (74 | ) |  | — |  |
| FTRs |  | MWh |  | 18 |  |  | — |  |  | 18 |  |  | — |  |
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 wholesale counterparties, net of collateral, as of March 31, 2019. 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. As of March 31, 2019, 99% of the net credit exposure for Power’s wholesale operations was with investment grade counterparties. Credit exposure is defined as any positive results of netting accounts receivable/accounts payable and the forward value of open positions (which includes all financial instruments including derivatives, NPNS and non-derivatives).
| Rating |  | Current Exposure |  | Securities held as Collateral |  | Net Exposure |  | Number of Counterparties >10% |  | Net Exposure of Counterparties >10% |  |
|  |  | Millions |  |  |  | Millions |  |
| Investment Grade |  | $ | 255 |  |  | $ | 15 |  |  | $ | 240 |  |  | 1 |  |  | $ | 166 |  | (A) |
| Non-Investment Grade |  | 2 |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  |
| Total |  | $ | 257 |  |  | $ | 16 |  |  | $ | 241 |  |  | 1 |  |  | $ | 166 |  |  |
(A) | Represents net exposure of $166 million with PSE&G.
As of March 31, 2019, collateral held from counterparties where Power had credit exposure included $1 million in cash collateral and $15 million in letters of credit. As of March 31, 2019, Power had 145 active counterparties.

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