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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Fair Value    
Less than one year $ 199  
One year through five years 2,339  
After five years through ten years 1,062  
Greater than ten years 1,747  
Fair Value 6,647 $ 13,240
Unrealized Losses    
Less than one year 2  
One year through five years 70  
After five years through ten years 68  
Greater than ten years 224  
Unrealized Losses 449 707
Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 461  
Fair Value 461 609
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 40  
Unrealized Losses 40 54
Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 529  
Fair Value 529 1,092
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 41  
Unrealized Losses 41 67
Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 310  
Fair Value 310 472
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 4  
Unrealized Losses 4 $ 7
Supporting experience-rated products    
Fair Value    
Less than one year 0  
One year through five years 68  
After five years through ten years 35  
Greater than ten years 124  
Fair Value 245  
Unrealized Losses    
Less than one year 0  
One year through five years 2  
After five years through ten years 3  
Greater than ten years 15  
Unrealized Losses 21  
Supporting experience-rated products | Residential mortgage-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 experience-rated products | Commercial mortgage-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 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 199  
One year through five years 2,271  
After five years through ten years 1,027  
Greater than ten years 1,623  
Fair Value 6,402  
Unrealized Losses    
Less than one year 2  
One year through five years 68  
After five years through ten years 65  
Greater than ten years 209  
Unrealized Losses 428  
Supporting remaining products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 455  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 40  
Supporting remaining products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 523  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 40  
Supporting remaining products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 304  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 4