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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Fair Value    
Less than one year $ 51  
One year through five years 2,242  
After five years through ten years 1,365  
Greater than ten years 462  
Fair Value 7,384 $ 915
Unrealized Losses    
Less than one year 1  
One year through five years 33  
After five years through ten years 27  
Greater than ten years 10  
Unrealized Losses 106 11
Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 629  
Fair Value 629 26
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 10  
Unrealized Losses 10 0
Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 574  
Fair Value 574 75
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 12  
Unrealized Losses 12 0
Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 2,061  
Fair Value 2,061 297
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 13  
Unrealized Losses 13 $ 2
Supporting experience- rated products    
Fair Value    
Less than one year 2  
One year through five years 13  
After five years through ten years 33  
Greater than ten years 17  
Fair Value 79  
Unrealized Losses    
Less than one year 0  
One year through five years 1  
After five years through ten years 1  
Greater than ten years 0  
Unrealized Losses 2  
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 0  
Supporting experience- rated products | Other asset-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 remaining products    
Fair Value    
Less than one year 49  
One year through five years 2,229  
After five years through ten years 1,332  
Greater than ten years 445  
Fair Value 7,305  
Unrealized Losses    
Less than one year 1  
One year through five years 32  
After five years through ten years 26  
Greater than ten years 10  
Unrealized Losses 104  
Supporting remaining products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 625  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 10  
Supporting remaining products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 568  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 12  
Supporting remaining products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 2,057  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 13