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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, 2022 $ / Derivative $ / mwh $ / DTH | Dec. 31, 2021 $ / mwh $ / DTH $ / Derivative
Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / DTH | 49 | 47
Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | (60) | (76)
FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | 24 | 27
Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / Derivative | 1,050 | 0

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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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