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Pension And OPEB (Schedule Of Pension And OPEB Costs) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | $ (9) | $ 1
Pension Benefits [Member] | PSE And G [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | (8) | (1)
Pension Benefits [Member] | Power [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | (2) | 0
Pension Benefits [Member] | Other Entity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | 1 | 2
OPEB [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | 26 | 22
OPEB [Member] | PSE And G [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | 17 | 14
OPEB [Member] | Power [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | 8 | 7
OPEB [Member] | Other Entity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | $ 1 | $ 1

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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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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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