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Financial Risk Management Activities (Schedule Of Gross Volume, On Absolute Basis For Derivative Contracts) (Detail) $ / mwh in Millions, $ / DTH in Millions | 12 Months Ended
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Dec. 31, 2021 $ / mwh $ / DTH | Dec. 31, 2020 $ / mwh $ / DTH
Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / DTH | (47) | (321)
Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Underlying, Derivative Volume | (76) | (66)
FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | (27) | (20)

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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 Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract but not the derivative contract itself. + References No definition available. + Details
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- Definition Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract measured in volume but not the derivative contract itself. + References No definition available. + Details
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- Details
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- Details
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