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Derivative Assets And Liabilities Table - Interest Rate Swaps Outstanding (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Discussion of Interest Rate Derivative Risk Management Policy Interest Rate RiskWe are exposed to market risk for changes in interest rates. To maintain a cost effective capital structure, we borrow funds using a mix of fixed rate debt and variable rate debt. We also manage our interest rate exposure by utilizing interest rate swaps to achieve a desired mix of fixed and variable rate debt. We also utilize forward starting interest rate swaps to lock in the rate on a portion of our anticipated debt issuances.  
July 2024    
Description of Interest Rate Derivative Activities [1],[2] Forward-starting to pay an average fixed rate of 3.388% and receive a floating rate  
Derivative, Notional Amount [2] $ 0 $ 400
April 2025    
Derivative, Fixed Interest Rate 3.9725%  
April 2025 | USAC [Member]    
Description of Interest Rate Derivative Activities [1],[3] Pay a fixed rate of 3.785% and receive a floating rate (effective April 2023)  
Derivative, Notional Amount [3] $ 700 $ 0
[1] Floating rates are based on SOFR.
[2] The July 2024 interest rate swaps were terminated and settled in August 2023.
[3] In October 2023, USAC modified its April 2025 interest rate swap. The termination date was extended from April 1, 2025 to December 31, 2025. Under the modified interest rate swap, USAC pays a fixed interest rate of 3.9725% and continues to receive floating interest rate payments that are indexed to the one-month SOFR.