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Leases Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Lessee, Lease, Description [Line Items]      
Operating Lease, Right-of-Use Asset $ 140 $ 141  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property, Plant and Equipment, Net Property, Plant and Equipment, Net  
Total lease liability $ 145 $ 144  
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other liabilities Other liabilities  
Variable lease cost $ 1 $ (2) $ 0
Hartford Next Program      
Lessee, Lease, Description [Line Items]      
Variable lease cost $ 0 $ 0 $ 6