v3.25.0.1
Debt - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Dec. 18, 2024
Oct. 08, 2024
Sep. 30, 2024
Aug. 29, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]                
Shareholders equity         $ 4,848 $ 4,526 $ 4,482 $ 5,341
Gain (loss) on extinguishment of debt         (1) 1 0  
Repurchase price percentage of principal amount 100.00%              
2024 Notes | Convertible Debt                
Debt Instrument [Line Items]                
Debt instrument, convertible, payments for debt conversion       $ 610        
Debt instrument, convertible, payments for debt conversion, outstanding principal         608      
Debt instrument, convertible, payments for debt conversion, accrued interest         $ 2      
2024 Notes | Convertible Debt | Class C capital stock                
Debt Instrument [Line Items]                
Settlement of convertible senior notes (in shares)         1.9      
Capped call transactions, portion unwound, shares received (in shares)     2.1          
2025 Notes                
Debt Instrument [Line Items]                
Debt instrument, repurchased face amount         $ 88 58    
Repayments of convertible debt         89 57    
Gain (loss) on extinguishment of debt         (1) 1    
2026 Notes | Convertible Debt                
Debt Instrument [Line Items]                
Debt instrument, convertible, payments for debt conversion         $ 498      
Debt instrument, notice for redemption of convertible debt, amount $ 499              
Debt conversion, converted instrument, amount   $ 498            
Debt instrument, redemption, aggregate principal, amount not surrendered for conversion $ 1              
2026 Notes | Convertible Debt | Class C capital stock                
Debt Instrument [Line Items]                
Settlement of convertible senior notes (in shares)         4.5      
Accumulated Deficit                
Debt Instrument [Line Items]                
Shareholders equity         $ (1,882) (1,770) $ (1,612) (1,667)
Cumulative-effect adjustment from adoption of guidance on accounting for convertible instruments and contracts in an entity’s own equity                
Debt Instrument [Line Items]                
Shareholders equity               (336)
Cumulative-effect adjustment from adoption of guidance on accounting for convertible instruments and contracts in an entity’s own equity | Accumulated Deficit                
Debt Instrument [Line Items]                
Shareholders equity               $ 156
Mortgages Segment                
Debt Instrument [Line Items]                
Borrowings Outstanding         145 93    
Atlas Securitized Products, L.P., JPMorgan Chase Bank, N.A, UBS AG | Mortgages Segment                
Debt Instrument [Line Items]                
Borrowings Outstanding         $ 151 $ 99