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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Fair Value    
Less than one year $ 1,091  
One year through five years 6,128  
After five years through ten years 3,315  
Greater than ten years 3,113  
Fair Value 17,658 $ 18,492
Unrealized Losses    
Less than one year 16  
One year through five years 386  
After five years through ten years 348  
Greater than ten years 396  
Unrealized Losses 1,433 1,840
Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 739  
Fair Value 739 721
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 79  
Unrealized Losses 79 89
Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 930  
Fair Value 930 992
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 140  
Unrealized Losses 140 155
Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 2,342  
Fair Value 2,342 2,587
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 68  
Unrealized Losses 68 $ 136
Supporting experience-rated products    
Fair Value    
Less than one year 17  
One year through five years 146  
After five years through ten years 121  
Greater than ten years 186  
Fair Value 519  
Unrealized Losses    
Less than one year 0  
One year through five years 5  
After five years through ten years 13  
Greater than ten years 22  
Unrealized Losses 44  
Supporting experience-rated products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 11  
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 19  
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 19  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 1  
Supporting remaining products    
Fair Value    
Less than one year 1,074  
One year through five years 5,982  
After five years through ten years 3,194  
Greater than ten years 2,927  
Fair Value 17,139  
Unrealized Losses    
Less than one year 16  
One year through five years 381  
After five years through ten years 335  
Greater than ten years 374  
Unrealized Losses 1,389  
Supporting remaining products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 728  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 78  
Supporting remaining products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 911  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 138  
Supporting remaining products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 2,323  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 67