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Debt and Derivatives - Derivatives (Detail) - Treasury Lock [Member] - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Nov. 30, 2024 | Dec. 31, 2024
Derivatives |  |
Cash received on derivative | $ 35 |
Ten-year rate [Member] |  |
Derivatives |  |
Derivative notional value |  | $ 900
Thirty-year rate [Member] |  |
Derivatives |  |
Derivative notional value |  | $ 650

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