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Investments - Narrative (Details)
$ in Millions
Mar. 31, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
Schedule of Investments [Line Items]    
Unfunded commitments to limited partnerships $ 481 $ 457
Percentage (based on amount of unrealized loss) of available for sale fixed maturities that are in an unrealized loss position and rated investment grade 96.00%  
Percentage (based on fair value) of available for sale fixed maturities that are in an unrealized loss position and rated investment grade 96.00%  
Multifamily    
Schedule of Investments [Line Items]    
Percent of real-estate related investments by property type 88.00% 88.00%
Total fixed maturities    
Schedule of Investments [Line Items]    
Gross unrealized losses on fixed maturities $ 301 $ 353
Number of fixed maturity securities in an unrealized loss position | security 1,200