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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Derivative [Line Items] |  |  |
Gain (Loss) Recognized in AOCI, After-Tax | $ (230) | $ 143 | $ (11)
Less: Loss Reclassified to Income, After-Tax | 30 | 11 | (4)
Pre-Tax Amount | (49) | (15) | 12
Cash Flow Hedges |  |  |
Derivative [Line Items] |  |  |
Balance as of Beginning of Year | (9) | (13) |
Balance as of End of Year | (4) | (9) | (13)
Balance as of Beginning of Year | (6) | (9) |
Gain (Loss) Recognized in AOCI, After-Tax | 0 | 0 | (4)
Less: Loss Reclassified to Income, After-Tax | 3 | 3 | 10
Balance as of End of Year | (3) | (6) | (9)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 0 | 0 |
Pre-Tax Amount | $ (5) | $ (4) | $ (14)

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