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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Fair Value    
Less than one year $ 1,128  
One year through five years 6,308  
After five years through ten years 2,698  
Greater than ten years 2,368  
Fair Value 15,001 $ 12,548
Unrealized Losses    
Less than one year 17  
One year through five years 223  
After five years through ten years 171  
Greater than ten years 287  
Unrealized Losses 863 836
Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 639  
Fair Value 639 614
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 60  
Unrealized Losses 60 60
Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 816  
Fair Value 816 675
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 93  
Unrealized Losses 93 100
Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 1,044  
Fair Value 1,044 1,316
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 12  
Unrealized Losses 12 $ 18
Supporting experience-rated products    
Fair Value    
Less than one year 11  
One year through five years 139  
After five years through ten years 76  
Greater than ten years 178  
Fair Value 442  
Unrealized Losses    
Less than one year 0  
One year through five years 4  
After five years through ten years 7  
Greater than ten years 22  
Unrealized Losses 36  
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 1  
Supporting experience-rated products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 15  
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 15  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 1  
Supporting remaining products    
Fair Value    
Less than one year 1,117  
One year through five years 6,169  
After five years through ten years 2,622  
Greater than ten years 2,190  
Fair Value 14,559  
Unrealized Losses    
Less than one year 17  
One year through five years 219  
After five years through ten years 164  
Greater than ten years 265  
Unrealized Losses 827  
Supporting remaining products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 631  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 59  
Supporting remaining products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 801  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 92  
Supporting remaining products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 1,029  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 11