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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 | 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] |  |  |  |  |
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | $ 2 | $ 17 | $ 30 | $ 14 |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion |  |  |  | 0 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (1) | (7) | (3) | (17) |
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion | 4 | 1 | 7 |  |
Cash Flow Hedges [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 3 | 1 | 5 | 0 | $ 3
Interest Rate Swap [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | 2 | 17 | 30 | 14 |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion |  |  |  | $ 0 |
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion | $ 4 | $ 1 | $ 7 |  |

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