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Financial Risk Management Activities (Schedule Providing Credit Risk From Others, Net Of Collateral) (Detail) - Power [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) Counterparty
Derivative [Line Items] |  |
Current Exposure | $ 265 |
Collateral held from counterparties | 12 |
Net Credit Exposure With Counterparties After Applying Collateral | 253 |
Number of Counterparties greater than 10% | 1 |
Net Exposure of Counterparties greater than 10% | $ 179 |
Number of active counterparties on credit risk derivatives | Counterparty | 151 |
Investment Grade External Rating [Member] |  |
Derivative [Line Items] |  |
Credit exposure, percentage | 99.00% |
Investment Grade [Member] |  |
Derivative [Line Items] |  |
Current Exposure | $ 264 |
Collateral held from counterparties | 12 |
Net Credit Exposure With Counterparties After Applying Collateral | 252 |
Number of Counterparties greater than 10% | 1 |
Net Exposure of Counterparties greater than 10% | 179 | [1]
Non-Investment Grade [Member] |  |
Derivative [Line Items] |  |
Current Exposure | 1 |
Collateral held from counterparties | 0 |
Net Credit Exposure With Counterparties After Applying Collateral | 1 |
Number of Counterparties greater than 10% | 0 |
Net Exposure of Counterparties greater than 10% | 0 |
Letter of Credit [Member] |  |
Derivative [Line Items] |  |
Collateral held from counterparties | $ 12 |
[1] | Represents net exposure 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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