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Financial Risk Management Activities (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | $ 112 |  |  | $ 112 |  | $ 44 |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | (6) |  | $ 25 | (29) | $ 78 |  |  |
Accumulated Other Comprehensive Income (Loss) |  | (407) | $ (410) | (204) | (407) | (204) | (229) | $ (226) | $ (263)
Power [Member] |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Securities held as Collateral |  | 14 |  |  | 14 |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 112 |  |  | 112 |  | 44 |  |
Fair Value of Derivatives with credit-risk related contingent features |  | 23 |  |  | 23 |  | 30 |  |
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral |  | 7 |  |  | 7 |  | 13 |  |
Additional collateral aggregate fair value |  | 16 |  |  | 16 |  | 17 |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | (5) |  | 24 | (23) | 74 |  |  |
Accumulated Other Comprehensive Income (Loss) |  | (347) | (350) | (152) | (347) | (152) | (172) | (172) | (211)
PSE And G [Member] |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  | (1) |  |  | (1) |  | 0 |  |
Cash Flow Hedging [Member] | PSEG [Member] |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  | 500 |  |  | 500 |  |  |  |
Cash Flow Hedges [Member] |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 0 | (1) | 0 | (1) | 0 | 0 |  |
Accumulated Other Comprehensive Income (Loss) |  | (1) | (1) | 1 | (1) | 1 | 0 | 2 | 2
Cash Flow Hedges [Member] | Power [Member] |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 0 |  | 0 | 0 | 0 |  |  |
Accumulated Other Comprehensive Income (Loss) |  | 0 | $ 0 | $ 0 | 0 | $ 0 | $ 0 | $ 0 | $ 0
Senior Notes Three Point Eight Five Percent due Two Thousand Twenty Three [Member] | Power [Member] |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 700 |  |  | $ 700 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.85% |  |  | 3.85% |  |  |  |
[1] | 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.
[2] | 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.

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