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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Fair Value    
Less than one year $ 1,072  
One year through five years 4,632  
After five years through ten years 2,012  
Greater than ten years 2,227  
Fair Value 12,548 $ 18,492
Unrealized Losses    
Less than one year 16  
One year through five years 229  
After five years through ten years 179  
Greater than ten years 234  
Unrealized Losses 836 1,840
Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 614  
Fair Value 614 721
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 60  
Unrealized Losses 60 89
Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 675  
Fair Value 675 992
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 100  
Unrealized Losses 100 155
Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 1,316  
Fair Value 1,316 2,587
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 18  
Unrealized Losses 18 $ 136
Supporting experience- rated products    
Fair Value    
Less than one year 15  
One year through five years 128  
After five years through ten years 87  
Greater than ten years 137  
Fair Value 403  
Unrealized Losses    
Less than one year 0  
One year through five years 3  
After five years through ten years 7  
Greater than ten years 14  
Unrealized Losses 28  
Supporting experience- rated products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 9  
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 2  
Supporting experience- rated products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 12  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 1  
Supporting remaining products    
Fair Value    
Less than one year 1,057  
One year through five years 4,504  
After five years through ten years 1,925  
Greater than ten years 2,090  
Fair Value 12,145  
Unrealized Losses    
Less than one year 16  
One year through five years 226  
After five years through ten years 172  
Greater than ten years 220  
Unrealized Losses 808  
Supporting remaining products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 605  
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 660  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 98  
Supporting remaining products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 1,304  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 17