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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
(Gain) Loss Reclassified into Income, pre-tax | $ 338 | $ 15 | $ 365 | $ 36 |
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax | 59 | (48) | 77 | (166) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 243 | 10 | 260 | 23 |
Cash Flow Hedges [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Pre-Tax Balance at Beginning of Period |  |  | (4) | (9) | $ (9)
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), pre-tax |  |  | 32 |  | 0
(Gain) Loss Reclassified into Income, pre-tax |  |  | (3) |  | 5
Pre-Tax Balance at End of Period | 25 |  | 25 |  | (4)
After-Tax Balance at Beginning of Period |  |  | (3) | (6) | (6)
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax | 13 | 0 | 23 | 0 | 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (2) | $ 1 | (2) | $ 2 | 3
After-Tax Balance at End of Period | $ 18 |  | $ 18 |  | $ (3)

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