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Financial Risk Management Activities (Schedule Of Reconciliation For Derivative Activity Included In Accumulated Other Comprehensive Loss) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative [Line Items] |  |  |
Gain (Loss) Recognized in AOCI, After-Tax | $ 146 | $ (230) | $ 143
Less: Loss Reclassified to Income, After-Tax | 225 | 30 | 11
Pre-Tax Amount | (307) | (49) | (15)
Cash Flow Hedges |  |  |
Derivative [Line Items] |  |  |
Balance as of Beginning of Year | (4) | (9) |
Balance as of End of Year | 4 | (4) | (9)
Balance as of Beginning of Year | (3) | (6) |
Gain (Loss) Recognized in AOCI, After-Tax | 9 | 0 | 0
Less: Loss Reclassified to Income, After-Tax | (3) | 3 | 3
Balance as of End of Year | 3 | (3) | (6)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 13 | 0 |
Pre-Tax Amount | $ 5 | $ (5) | $ (4)

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