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Financial Risk Management Activities (Schedule Of Gross Volume, On Absolute Basis For Derivative Contracts) (Detail) $ / mwh in Millions, $ / Derivative in Millions, $ / DTH in Millions | 12 Months Ended
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Dec. 31, 2023 $ / mwh $ / DTH $ / Derivative | Dec. 31, 2022 $ / mwh $ / DTH $ / Derivative
Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / DTH | 66 | 49
Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / mwh | (60) | (60)
FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / mwh | 19 | 24
Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / Derivative | 1,400 |
Interest Rate Contract |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / Derivative | 2,000 | 1,050

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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480237/815-40-50-5 + Details
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