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Financial Risk Management Activities (Schedule Providing Credit Risk From Others, Net Of Collateral) (Detail) $ in Millions | Jun. 30, 2015 USD ($)
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Power [Member] |  |
Derivative [Line Items] |  |
Current Exposure |  | $ 322
Securities held as Collateral |  | 82
Net exposure |  | 314
Number of Counterparties greater than 10% |  | 2
Amount Of Net Credit Exposure Greater Than Ten Percent |  | 119
Power [Member] | Investment Grade - External Rating [Member] |  |
Derivative [Line Items] |  |
Current Exposure |  | 310
Securities held as Collateral |  | 82
Net exposure |  | 302
Number of Counterparties greater than 10% |  | 2
Amount Of Net Credit Exposure Greater Than Ten Percent | [1] | 119
Power [Member] | Non-Investment Grade - External Rating [Member] |  |
Derivative [Line Items] |  |
Current Exposure |  | 2
Securities held as Collateral |  | 0
Net exposure |  | 2
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 |  | 10
Securities held as Collateral |  | 0
Net exposure |  | 10
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 |  | 0
Securities held as Collateral |  | 0
Net exposure |  | 0
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 |  | $ 82
[1] | net exposure of $82 million with PSE&G.

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