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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Fair Value    
Less than one year $ 478  
One year through five years 2,996  
After five years through ten years 1,112  
Greater than ten years 1,484  
Fair Value 7,455 $ 12,548
Unrealized Losses    
Less than one year 5  
One year through five years 109  
After five years through ten years 90  
Greater than ten years 153  
Unrealized Losses 453 836
Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 397  
Fair Value 397 614
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 33  
Unrealized Losses 33 60
Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 638  
Fair Value 638 675
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 58  
Unrealized Losses 58 100
Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 350  
Fair Value 350 1,316
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 5  
Unrealized Losses 5 $ 18
Supporting experience-rated products    
Fair Value    
Less than one year 1  
One year through five years 65  
After five years through ten years 48  
Greater than ten years 106  
Fair Value 246  
Unrealized Losses    
Less than one year 0  
One year through five years 2  
After five years through ten years 4  
Greater than ten years 9  
Unrealized Losses 16  
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 10  
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 10  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Supporting remaining products    
Fair Value    
Less than one year 477  
One year through five years 2,931  
After five years through ten years 1,064  
Greater than ten years 1,378  
Fair Value 7,209  
Unrealized Losses    
Less than one year 5  
One year through five years 107  
After five years through ten years 86  
Greater than ten years 144  
Unrealized Losses 437  
Supporting remaining products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 391  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 33  
Supporting remaining products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 628  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 57  
Supporting remaining products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 340  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 5