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Financial Risk Management Activities (Schedule Of Derivative Instruments Not Designated As Hedging Instruments And Impact On Results Of Operations) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pre-Tax Gain (Loss) Recognized in Income on Derivatives | $ 1,567 | $ (1,746) | $ (867)
Operating Revenues [Member] | Energy-Related Contracts [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pre-Tax Gain (Loss) Recognized in Income on Derivatives | 1,567 | (1,748) | (993)
Energy Costs [Member] | Energy-Related Contracts [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pre-Tax Gain (Loss) Recognized in Income on Derivatives | $ 0 | $ 2 | $ 126

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