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Financial Risk Management Activities (Schedule Of Reconciliation For Derivative Activity Included In Accumulated Other Comprehensive Loss) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
(Gain) Loss Reclassified into Income, pre-tax | $ 0 | $ 11 | $ 4 | $ 27 |
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax | (5) | 0 | 3 | 18 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 1 | 7 | 3 | 17 |
Cash Flow Hedges [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Pre-Tax Balance at Beginning of Period |  |  | 4 | (4) | $ (4)
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), pre-tax |  |  | 30 |  | 13
(Gain) Loss Reclassified into Income, pre-tax |  |  | (7) |  | (5)
Pre-Tax Balance at End of Period | 27 |  | 27 |  | 4
After-Tax Balance at Beginning of Period |  |  | 3 | (3) | (3)
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax | 2 | 12 | 22 | 10 | 9
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (3) | $ (1) | (5) | $ 0 | (3)
After-Tax Balance at End of Period | $ 20 |  | $ 20 |  | $ 3

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