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Financial Risk Management Activities (Schedule Providing Credit Risk From Others, Net Of Collateral) (Detail) - Power [Member] $ in Millions | Mar. 31, 2016 USD ($)
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Derivative [Line Items] |  |
Current Exposure | $ 582 |
Securities held as Collateral | 231 |
Net exposure | 351 |
Number of Counterparties greater than 10% | 1 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 178 |
Investment Grade - External Rating [Member] |  |
Derivative [Line Items] |  |
Current Exposure | 542 |
Securities held as Collateral | 230 |
Net exposure | 312 |
Number of Counterparties greater than 10% | 1 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 178 | [1]
Non-Investment Grade - External Rating [Member] |  |
Derivative [Line Items] |  |
Current Exposure | 30 |
Securities held as Collateral | 0 |
Net exposure | 30 |
Number of Counterparties greater than 10% | 0 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 0 |
Investment Grade - No External Rating [Member] |  |
Derivative [Line Items] |  |
Current Exposure | 10 |
Securities held as Collateral | 1 |
Net exposure | 9 |
Number of Counterparties greater than 10% | 0 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 0 |
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 |
Cash [Member] |  |
Derivative [Line Items] |  |
Securities held as Collateral | 16 |
Letter of Credit [Member] |  |
Derivative [Line Items] |  |
Securities held as Collateral | $ 215 |
[1] | Represents net exposure with PSE&G.

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