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Fair Value of Financial Instruments - Schedule of Carrying Value and Fair Value, Senior Notes (Details) - Level 2 - Senior Unsecured Notes Effective September 2018 - Senior Notes - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Carrying value, net of unamortized debt issuance costs, unamortized premium, and accrued PIK interest    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes $ 4,123 $ 4,549
Fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes $ 4,516 $ 5,050