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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | $ 28 | $ (3) |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion |  | (1) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (2) | (10) |
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion | 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) | $ 3
Interest Rate Swap [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | 28 | (3) |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion |  | $ (1) |
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion | $ 3 |  |

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