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Financial Risk Management Activities (Schedule Of Derivative Instruments Fair Value In Balance Sheets) (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Derivative Contracts, Current Assets |  | $ 84 | $ 163
Derivative Contracts, Noncurrent Assets |  | 62 | 24
Total Mark-to-Market Derivative Assets |  | 146 | 187
Derivative Contracts, Current Liabilities |  | (7) | (13)
Derivative Contracts, Noncurrent Liabilities |  | (1) | (3)
Total Mark-to-Market Derivative (Liabilities) |  | (8) | (16)
Net Mark-to-Market Derivative Assets (Liabilities) |  | 138 | 171
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | (14) | 1
Power [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Contracts, Current Assets | [1] | 84 | 162
Derivative Contracts, Noncurrent Assets | [1] | 62 | 24
Total Mark-to-Market Derivative Assets | [1] | 146 | 186
Derivative Contracts, Current Liabilities | [1] | (7) | (8)
Derivative Contracts, Noncurrent Liabilities | [1] | (1) | (3)
Total Mark-to-Market Derivative (Liabilities) | [1] | (8) | (11)
Net Mark-to-Market Derivative Assets (Liabilities) | [1] | 138 | 175
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | (14) | 1
PSE And G [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Contracts, Current Liabilities |  | 0 | (5)
Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | (14) | (3)
Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | (7) |
Non Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | (7) | (3)
Current Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  |  | 4
Other Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  |  | 4
Energy-Related Contracts [Member] | Not Designated as Hedging Instrument [Member] | Power [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Contracts, Current Assets | [1] | 352 | 435
Derivative Contracts, Noncurrent Assets | [1] | 178 | 122
Total Mark-to-Market Derivative Assets | [1] | 530 | 557
Derivative Contracts, Current Liabilities | [1] | (268) | (285)
Derivative Contracts, Noncurrent Liabilities | [1] | (110) | (98)
Total Mark-to-Market Derivative (Liabilities) | [1] | (378) | (383)
Net Mark-to-Market Derivative Assets (Liabilities) | [1] | 152 | 174
Energy-Related Contracts [Member] | Not Designated as Hedging Instrument [Member] | PSE And G [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Contracts, Current Assets | [1] |  | 0
Derivative Contracts, Noncurrent Assets | [1] |  | 0
Total Mark-to-Market Derivative Assets | [1] |  | 0
Derivative Contracts, Current Liabilities | [1] |  | (5)
Derivative Contracts, Noncurrent Liabilities | [1] |  | 0
Total Mark-to-Market Derivative (Liabilities) | [1] |  | (5)
Net Mark-to-Market Derivative Assets (Liabilities) | [1] |  | (5)
Energy-Related Contracts [Member] | Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [3] | (384) | (371)
Energy-Related Contracts [Member] | Assets [Member] | Power [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2],[3] | (384) | (371)
Energy-Related Contracts [Member] | Assets [Member] | PSE And G [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [3] |  | 0
Energy-Related Contracts [Member] | Current Assets [Member] | Power [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | (268) | (273)
Energy-Related Contracts [Member] | Non Current Assets [Member] | Power [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | (116) | (98)
Energy-Related Contracts [Member] | Current Liabilities [Member] | Power [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 261 | 277
Energy-Related Contracts [Member] | Noncurrent Liabilities [Member] | Power [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 109 | 95
Energy-Related Contracts [Member] | Other Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [3] | 370 | 372
Energy-Related Contracts [Member] | Other Liabilities [Member] | Power [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2],[3] | 370 | 372
Energy-Related Contracts [Member] | Other Liabilities [Member] | PSE And G [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [3] |  | 0
Interest Rate Swap [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [3] |  | 0
Interest Rate Swap [Member] | PSEG [Member] | Fair Value Hedging [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Contracts, Current Assets | [1] | 0 | 1
Derivative Contracts, Noncurrent Assets | [1] | 0 | 0
Total Mark-to-Market Derivative Assets | [1] | 0 | 1
Derivative Contracts, Current Liabilities | [1] | 0 | 0
Derivative Contracts, Noncurrent Liabilities | [1] | 0 | 0
Total Mark-to-Market Derivative (Liabilities) | [1] | 0 | 0
Net Mark-to-Market Derivative Assets (Liabilities) | [1] | $ 0 | $ 1
[1] | 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.
[2] | 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.
[3] | 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 in 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. The $(14) million of cash collateral as of September 30, 2017 was netted against 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 of cash collateral as of December 31, 2016, $(3) million was netted against assets, and $4 million was netted against liabilities.

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