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Financial Risk Management Activities (Schedule Providing Credit Risk From Others, Net Of Collateral) (Detail) $ in Millions | Sep. 30, 2015 USD ($)
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Power [Member] |  |
Derivative [Line Items] |  |
Current Exposure | $ 364 |
Securities held as Collateral | 118 |
Net exposure | 246 |
Number of Counterparties greater than 10% | 2 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 127 |
Power [Member] | Investment Grade - External Rating [Member] |  |
Derivative [Line Items] |  |
Current Exposure | 348 |
Securities held as Collateral | 118 |
Net exposure | 230 |
Number of Counterparties greater than 10% | 2 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 127 | [1]
Power [Member] | Non-Investment Grade - External Rating [Member] |  |
Derivative [Line Items] |  |
Current Exposure | 1 |
Securities held as Collateral | 0 |
Net exposure | 1 |
Number of Counterparties greater than 10% | 0 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 0 |
Power [Member] | Investment Grade - No External Rating [Member] |  |
Derivative [Line Items] |  |
Current Exposure | 11 |
Securities held as Collateral | 0 |
Net exposure | 11 |
Number of Counterparties greater than 10% | 0 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 0 |
Power [Member] | Non-Investment Grade - No External Rating [Member] |  |
Derivative [Line Items] |  |
Current Exposure | 4 |
Securities held as Collateral | 0 |
Net exposure | 4 |
Number of Counterparties greater than 10% | 0 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 0 |
PSE And G [Member] | Investment Grade - External Rating [Member] |  |
Derivative [Line Items] |  |
Net exposure | $ 87 |
[1] | net exposure of $87 million with PSE&G.

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