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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Fair Value    
Less than one year $ 509  
One year through five years 3,485  
After five years through ten years 1,673  
Greater than ten years 1,949  
Fair Value 9,902 $ 13,240
Unrealized Losses    
Less than one year 8  
One year through five years 98  
After five years through ten years 98  
Greater than ten years 243  
Unrealized Losses 547 707
Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 445  
Fair Value 445 609
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 41  
Unrealized Losses 41 54
Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 694  
Fair Value 694 1,092
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 50  
Unrealized Losses 50 67
Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 1,147  
Fair Value 1,147 472
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 9  
Unrealized Losses 9 $ 7
Supporting experience-rated products    
Fair Value    
Less than one year 1  
One year through five years 92  
After five years through ten years 64  
Greater than ten years 129  
Fair Value 304  
Unrealized Losses    
Less than one year 0  
One year through five years 2  
After five years through ten years 4  
Greater than ten years 15  
Unrealized Losses 22  
Supporting experience-rated products | Residential 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 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 7  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Supporting remaining products    
Fair Value    
Less than one year 508  
One year through five years 3,393  
After five years through ten years 1,609  
Greater than ten years 1,820  
Fair Value 9,598  
Unrealized Losses    
Less than one year 8  
One year through five years 96  
After five years through ten years 94  
Greater than ten years 228  
Unrealized Losses 525  
Supporting remaining products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 440  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 41  
Supporting remaining products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 688  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 49  
Supporting remaining products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 1,140  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 9