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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair Value    
Less than one year $ 133  
One year through five years 1,761  
After five years through ten years 946  
Greater than ten years 1,531  
Fair Value 5,440 $ 13,240
Unrealized Losses    
Less than one year 2  
One year through five years 48  
After five years through ten years 43  
Greater than ten years 172  
Unrealized Losses 332 707
Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 357  
Fair Value 357 609
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 34  
Unrealized Losses 34 54
Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 400  
Fair Value 400 1,092
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 32  
Unrealized Losses 32 67
Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 312  
Fair Value 312 472
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 1  
Unrealized Losses 1 $ 7
Supporting experience-rated products    
Fair Value    
Less than one year 0  
One year through five years 50  
After five years through ten years 19  
Greater than ten years 101  
Fair Value 189  
Unrealized Losses    
Less than one year 0  
One year through five years 2  
After five years through ten years 1  
Greater than ten years 11  
Unrealized Losses 15  
Supporting experience-rated products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 8  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Supporting experience-rated products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 5  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 1  
Supporting experience-rated products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 6  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Supporting remaining products    
Fair Value    
Less than one year 133  
One year through five years 1,711  
After five years through ten years 927  
Greater than ten years 1,430  
Fair Value 5,251  
Unrealized Losses    
Less than one year 2  
One year through five years 46  
After five years through ten years 42  
Greater than ten years 161  
Unrealized Losses 317  
Supporting remaining products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 349  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 34  
Supporting remaining products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 395  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 31  
Supporting remaining products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 306  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 1