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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
(Gain) Loss Reclassified into Income, pre-tax | $ 4 | $ 16 |
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax | 8 | 18 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 2 | 10 |
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 | 28 |  | 13
(Gain) Loss Reclassified into Income, pre-tax | (3) |  | (5)
Pre-Tax Balance at End of Period | 29 |  | 4
After-Tax Balance at Beginning of Period | 3 | (3) | (3)
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax | 20 | (2) | 9
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (2) | $ 1 | (3)
After-Tax Balance at End of Period | $ 21 |  | $ 3

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