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Derivative Assets And Liabilities (Interest Rate Swaps Outstanding) (Details) - April 2025 - Derivatives Not Designated As Hedging Instruments - Interest Rate Derivatives [Member] - Forward-Starting Swaps [Member] - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2024 | Dec. 31, 2023
Description of Interest Rate Derivative Activities | [1] | Pay a fixed rate of 3.9725% and receive a floating rate based on SOFR |
Derivative, Notional Amount | [1] | $ 0 | $ 700
[1] | In August 2024, USAC elected to terminate the outstanding interest rate swap.

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