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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Fair Value    
Less than one year $ 201  
One year through five years 4,432  
After five years through ten years 3,421  
Greater than ten years 1,633  
Fair Value 13,547 $ 7,384
Unrealized Losses    
Less than one year 1  
One year through five years 194  
After five years through ten years 223  
Greater than ten years 132  
Unrealized Losses 726 106
Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 686  
Fair Value 686 629
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 48  
Unrealized Losses 48 10
Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 831  
Fair Value 831 574
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 67  
Unrealized Losses 67 12
Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 2,343  
Fair Value 2,343 2,061
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 61  
Unrealized Losses 61 $ 13
Supporting experience-rated products    
Fair Value    
Less than one year 2  
One year through five years 27  
After five years through ten years 83  
Greater than ten years 56  
Fair Value 192  
Unrealized Losses    
Less than one year 0  
One year through five years 1  
After five years through ten years 6  
Greater than ten years 4  
Unrealized Losses 13  
Supporting experience-rated products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 4  
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 14  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 1  
Supporting remaining products    
Fair Value    
Less than one year 199  
One year through five years 4,405  
After five years through ten years 3,338  
Greater than ten years 1,577  
Fair Value 13,355  
Unrealized Losses    
Less than one year 1  
One year through five years 193  
After five years through ten years 217  
Greater than ten years 128  
Unrealized Losses 713  
Supporting remaining products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 682  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 48  
Supporting remaining products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 825  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 66  
Supporting remaining products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 2,329  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 60