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Financial Risk Management Activities (Schedule Of Derivative Transactions Designated And Effective As Cash Flow Hedges) (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] |  |  |  |  |
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | $ 18 | $ 0 | $ 32 | $ 0 |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion |  | (1) |  | (3) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (243) | (10) | (260) | (23) |
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion | 3 |  | 3 |  |
Cash Flow Hedges [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 2 | (1) | 2 | (2) | $ (3)
Interest Rate Swap [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | 18 | 0 | 32 | 0 |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion |  | $ (1) |  | $ (3) |
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion | $ 3 |  | $ 3 |  |

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