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Financial Risk Management Activities (Tables) | 9 Months Ended
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Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Schedule Of Derivative Instruments Fair Value In Balance Sheets |
|  |  | As of September 30, 2018 |
|  |  | Power (A) |  | Consolidated |
|  |  | Not Designated |  |  |  |  |  |  |
| Balance Sheet Location |  | Energy- Related Contracts |  | Netting (B) |  | Total Power |  | Total Derivatives |
|  |  | Millions |
| Derivative Contracts |  |  |  |  |  |  |  |  |
| Current Assets |  | $ | 301 |  |  | $ | (290 | ) |  | $ | 11 |  |  | $ | 11 |  |
| Noncurrent Assets |  | 123 |  |  | (121 | ) |  | 2 |  |  | 2 |  |
| Total Mark-to-Market Derivative Assets |  | $ | 424 |  |  | $ | (411 | ) |  | $ | 13 |  |  | $ | 13 |  |
| Derivative Contracts |  |  |  |  |  |  |  |  |
| Current Liabilities |  | $ | (389 | ) |  | $ | 376 |  |  | $ | (13 | ) |  | $ | (13 | ) |
| Noncurrent Liabilities |  | (149 | ) |  | 147 |  |  | (2 | ) |  | (2 | ) |
| Total Mark-to-Market Derivative (Liabilities) |  | $ | (538 | ) |  | $ | 523 |  |  | $ | (15 | ) |  | $ | (15 | ) |
| Total Net Mark-to-Market Derivative Assets (Liabilities) |  | $ | (114 | ) |  | $ | 112 |  |  | $ | (2 | ) |  | $ | (2 | ) |
|  |  | As of December 31, 2017 |
|  |  | Power (A) |  | Consolidated |
|  |  | Not Designated |  |  |  |  |  |  |
| Balance Sheet Location |  | Energy- Related Contracts |  | Netting (B) |  | Total Power |  | Total Derivatives |
|  |  | Millions |
| Derivative Contracts |  |  |  |  |  |  |  |  |
| Current Assets |  | $ | 391 |  |  | $ | (362 | ) |  | $ | 29 |  |  | $ | 29 |  |
| Noncurrent Assets |  | 78 |  |  | (71 | ) |  | 7 |  |  | 7 |  |
| Total Mark-to-Market Derivative Assets |  | $ | 469 |  |  | $ | (433 | ) |  | $ | 36 |  |  | $ | 36 |  |
| Derivative Contracts |  |  |  |  |  |  |  |  |
| Current Liabilities |  | $ | (403 | ) |  | $ | 387 |  |  | $ | (16 | ) |  | $ | (16 | ) |
| Noncurrent Liabilities |  | (95 | ) |  | 90 |  |  | (5 | ) |  | (5 | ) |
| Total Mark-to-Market Derivative (Liabilities) |  | $ | (498 | ) |  | $ | 477 |  |  | $ | (21 | ) |  | $ | (21 | ) |
| Total Net Mark-to-Market Derivative Assets (Liabilities) |  | $ | (29 | ) |  | $ | 44 |  |  | $ | 15 |  |  | $ | 15 |  |
(A) | Substantially all of Power’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, 2018 and December 31, 2017.
(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, 2018 and December 31, 2017, Power had net cash collateral/margin payments to counterparties of $223 million and $146 million, respectively. Of these net cash/collateral margin payments $112 million as of September 30, 2018 and $44 million as December 31, 2017 were netted against the corresponding net derivative contract positions. Of the $112 million as of September 30, 2018, $(2) million was netted against current assets, and $(1) million was netted against noncurrent assets, $88 million was netted against current liabilities, and $27 million was netted against noncurrent liabilities. Of the $44 million as of December 31, 2017, $(3) million was netted against current assets, $28 million was netted against current liabilities, and $19 million was netted against noncurrent liabilities.
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, 2016 |  | $ | 3 |  |  | $ | 2 |  |
| Gain Recognized in AOCI |  | — |  |  | — |  |
| Less: Gain Reclassified into Income |  | (3 | ) |  | (2 | ) |
| Balance as of December 31, 2017 |  | $ | — |  |  | $ | — |  |
| Loss Recognized in AOCI |  | (2 | ) |  | (1 | ) |
| Less: Loss Reclassified into Income |  | — |  |  | — |  |
| Balance as of September 30, 2018 |  | $ | (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, 2018 and 2017. 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 |  | Pre-Tax Gain (Loss) Recognized in Income on Derivatives |
|  |  |  |  | Three Months Ended |  | Nine Months Ended |
|  |  |  |  | September 30, |  | September 30, |
|  |  |  |  | 2018 |  | 2017 |  | 2018 |  | 2017 |
|  |  |  |  | Millions |
| PSEG and Power |  |  |  |  |  |  |  |  |  |  |
| Energy-Related Contracts |  | Operating Revenues |  | $ | (130 | ) |  | $ | 26 |  |  | $ | (154 | ) |  | $ | 216 |  |
| Energy-Related Contracts |  | Energy Costs |  | 5 |  |  | (4 | ) |  | 12 |  |  | (14 | ) |
| Total PSEG and Power |  |  |  | $ | (125 | ) |  | $ | 22 |  |  | $ | (142 | ) |  | $ | 202 |  |
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 September 30, 2018 and December 31, 2017.
| Type |  | Notional |  | Total |  | PSEG |  | Power |  | PSE&G |
|  |  |  |  | Millions |
| As of September 30, 2018 |  |  |  |  |  |  |  |  |  |  |
| Natural Gas |  | Dekatherm (Dth) |  | 281 |  |  | — |  |  | 281 |  |  | — |  |
| Electricity |  | MWh |  | (66 | ) |  | — |  |  | (66 | ) |  | — |  |
| Financial Transmission Rights (FTRs) |  | MWh |  | 24 |  |  | — |  |  | 24 |  |  | — |  |
| As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
| Natural Gas |  | Dth |  | 154 |  |  | — |  |  | 154 |  |  | — |  |
| Electricity |  | MWh |  | (63 | ) |  | — |  |  | (63 | ) |  | — |  |
| FTRs |  | MWh |  | 6 |  |  | — |  |  | 6 |  |  | — |  |
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 September 30, 2018. 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 September 30, 2018, 97% 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 |  | $ | 112 |  |  | $ | 12 |  |  | $ | 100 |  |  | 2 |  |  | $ | 50 |  | (A) |
| Non-Investment Grade |  | 6 |  |  | 2 |  |  | 4 |  |  | — |  |  | — |  |  |
| Total |  | $ | 118 |  |  | $ | 14 |  |  | $ | 104 |  |  | 2 |  |  | $ | 50 |  |  |
(A) | Represents net exposure of $39 million with PSE&G and $11 million with a non-affiliated counterparty.
As of September 30, 2018, collateral held from counterparties where Power had credit exposure included $2 million in cash collateral and $12 million in letters of credit. As of September 30, 2018, Power had 137 active counterparties.

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- Definition Tabular disclosure of the effective portion of the gains and losses on derivative instruments designated (and non-derivative instruments) designated and qualifying in cash flow hedges and net investment hedges that was recognized in other comprehensive income (loss) during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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