v3.25.2
Debt - Schedule of Carrying Value of Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Total debt $ 230 $ 563
2025 Notes | Convertible Debt    
Debt Instrument [Line Items]    
2025 Notes 0 418
Mortgages Segment    
Debt Instrument [Line Items]    
Total master repurchase agreements 230 145
Line of Credit    
Debt Instrument [Line Items]    
Total master repurchase agreements 230  
JPMorgan Chase Bank, N.A. | Line of Credit    
Debt Instrument [Line Items]    
Total master repurchase agreements 92  
JPMorgan Chase Bank, N.A. | Line of Credit | Mortgages Segment    
Debt Instrument [Line Items]    
Total master repurchase agreements 92 72
UBS AG | Line of Credit    
Debt Instrument [Line Items]    
Total master repurchase agreements 74  
UBS AG | Line of Credit | Mortgages Segment    
Debt Instrument [Line Items]    
Total master repurchase agreements 74 73
Bank of Montreal | Line of Credit    
Debt Instrument [Line Items]    
Total master repurchase agreements 64  
Bank of Montreal | Line of Credit | Mortgages Segment    
Debt Instrument [Line Items]    
Total master repurchase agreements $ 64 $ 0