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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Fair Value    
Less than one year $ 22  
One year through five years 1,270  
After five years through ten years 949  
Greater than ten years 605  
Fair Value 4,390 $ 915
Unrealized Losses    
Less than one year 0  
One year through five years 11  
After five years through ten years 17  
Greater than ten years 12  
Unrealized Losses 55 11
Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 486  
Fair Value 486 26
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 5  
Unrealized Losses 5 0
Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 389  
Fair Value 389 75
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 8  
Unrealized Losses 8 0
Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 669  
Fair Value 669 297
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 2  
Unrealized Losses 2 $ 2
Supporting experience-rated products    
Fair Value    
Less than one year 0  
One year through five years 6  
After five years through ten years 29  
Greater than ten years 19  
Fair Value 60  
Unrealized Losses    
Less than one year 0  
One year through five years 0  
After five years through ten years 1  
Greater than ten years 0  
Unrealized Losses 1  
Supporting experience-rated products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 0  
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 0  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Supporting remaining products    
Fair Value    
Less than one year 22  
One year through five years 1,264  
After five years through ten years 920  
Greater than ten years 586  
Fair Value 4,330  
Unrealized Losses    
Less than one year 0  
One year through five years 11  
After five years through ten years 16  
Greater than ten years 12  
Unrealized Losses 54  
Supporting remaining products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 486  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 5  
Supporting remaining products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 383  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 8  
Supporting remaining products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 669  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 2