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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, 2019 | Mar. 31, 2018
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | $ 12 | $ (9)
Pension Benefits [Member] | PSE And G [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | 7 | (8)
Pension Benefits [Member] | Power [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | 3 | (2)
Pension Benefits [Member] | Other Entity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | 2 | 1
OPEB [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | (15) | 26
OPEB [Member] | PSE And G [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | (16) | 17
OPEB [Member] | Power [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | 1 | 8
OPEB [Member] | Other Entity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Benefit Costs | $ 0 | $ 1

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