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Borrowings and Other Debt Obligations - Fair and Carrying Value of Long-Term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Oct. 27, 2021
Senior Notes 8.625 Percent Due 2030      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying Value $ 1,552 $ 1,586  
Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying Value 1,552 1,586  
Senior Notes | Senior Notes 8.625 Percent Due 2030      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate     8.625%
Fair Value, Inputs, Level 2 | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value 1,590 1,650  
Fair Value, Inputs, Level 2 | Senior Notes | Fair Value | Senior Notes 8.625 Percent Due 2030      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value $ 1,590 $ 1,650