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Trust Investments (Fair Value Of Rabbi Trust) (Detail) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of Trust Investments [Line Items] |  |
Total Rabbi Trust Investments | $ 233 | $ 224
Power [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Total Rabbi Trust Investments | 59 | 56
PSE And G [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Total Rabbi Trust Investments | 46 | 45
Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Total Rabbi Trust Investments | 233 | 224
Rabbi Trust [Member] | Power [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Total Rabbi Trust Investments | 59 | 56
Rabbi Trust [Member] | PSE And G [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Total Rabbi Trust Investments | 46 | 45
Rabbi Trust [Member] | Other Entity [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Total Rabbi Trust Investments | $ 128 | $ 123

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- Definition The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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