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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Fair Value    
Less than one year $ 445  
One year through five years 5,116  
After five years through ten years 3,864  
Greater than ten years 3,239  
Fair Value 16,918 $ 7,384
Unrealized Losses    
Less than one year 5  
One year through five years 322  
After five years through ten years 486  
Greater than ten years 392  
Unrealized Losses 1,515 106
Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 709  
Fair Value 709 629
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 61  
Unrealized Losses 61 10
Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 1,073  
Fair Value 1,073 574
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 114  
Unrealized Losses 114 12
Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 2,472  
Fair Value 2,472 2,061
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 135  
Unrealized Losses 135 $ 13
Supporting experience-rated products    
Fair Value    
Less than one year 7  
One year through five years 54  
After five years through ten years 151  
Greater than ten years 196  
Fair Value 468  
Unrealized Losses    
Less than one year 0  
One year through five years 2  
After five years through ten years 15  
Greater than ten years 18  
Unrealized Losses 39  
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 33  
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 16  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 1  
Supporting remaining products    
Fair Value    
Less than one year 438  
One year through five years 5,062  
After five years through ten years 3,713  
Greater than ten years 3,043  
Fair Value 16,450  
Unrealized Losses    
Less than one year 5  
One year through five years 320  
After five years through ten years 471  
Greater than ten years 374  
Unrealized Losses 1,476  
Supporting remaining products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 698  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 60  
Supporting remaining products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 1,040  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 112  
Supporting remaining products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 2,456  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 134