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Debt - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
Outstanding debt $ 4,266 $ 4,349
Debt issuance costs 55 60
Unamortized discount $ 118 123
Senior Secured Notes | 7.32% senior exchangeable notes due 2026    
Debt Instrument [Line Items]    
Interest rate 7.32%  
Term Loan    
Debt Instrument [Line Items]    
Weighted average interest rate 8.95%  
Letter of Credit    
Debt Instrument [Line Items]    
Cash collateral for borrowed securities $ 21 21
Letter of Credit | Line of Credit    
Debt Instrument [Line Items]    
Outstanding letters of credit $ 11 $ 11