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Financial Risk Management Activities (Schedule Providing Credit Risk From Others, Net Of Collateral) (Detail) - Power [Member] $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($) Counterparty
Derivative [Line Items] |  |
Current Exposure | $ 257 |
Securities held as Collateral | 16 |
Net exposure | 241 |
Number of Counterparties greater than 10% | $ 1 |
Number Of Active Counterparties On Credit Risk Derivatives | Counterparty | 145 |
Investment Grade - External Rating [Member] |  |
Derivative [Line Items] |  |
Percentage Of Credit Exposure | 99.00% |
Investment Grade [Member] |  |
Derivative [Line Items] |  |
Current Exposure | $ 255 |
Securities held as Collateral | 15 |
Net exposure | 240 |
Number of Counterparties greater than 10% | 1 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 166 | [1]
External Credit Rating, Non Investment Grade [Member] |  |
Derivative [Line Items] |  |
Current Exposure | 2 |
Securities held as Collateral | 1 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 0 |
Non-Investment Grade [Member] |  |
Derivative [Line Items] |  |
Net exposure | 1 |
Number of Counterparties greater than 10% | 0 |
Cash [Member] |  |
Derivative [Line Items] |  |
Securities held as Collateral | 1 |
Letter of Credit [Member] |  |
Derivative [Line Items] |  |
Securities held as Collateral | $ 15 |
[1] | Represents net exposure of $166 million with PSE&G.

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- Definition The carrying amount (fair value) as of the balance sheet date of securities held that had been pledged by counterparties under financing and lending arrangements, pursuant to which the entity has the right by agreement or custom to sell or re-pledge such securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 + Details
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