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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Fair Value    
Less than one year $ 23  
One year through five years 1,006  
After five years through ten years 628  
Greater than ten years 238  
Fair Value 3,067 $ 915
Unrealized Losses    
Less than one year 0  
One year through five years 7  
After five years through ten years 11  
Greater than ten years 5  
Unrealized Losses 32 11
Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 398  
Fair Value 398 26
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 3  
Unrealized Losses 3 0
Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 241  
Fair Value 241 75
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 5  
Unrealized Losses 5 0
Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 533  
Fair Value 533 297
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 1  
Unrealized Losses 1 $ 2
Supporting experience-rated products    
Fair Value    
Less than one year 0  
One year through five years 1  
After five years through ten years 15  
Greater than ten years 2  
Fair Value 25  
Unrealized Losses    
Less than one year 0  
One year through five years 0  
After five years through ten years 0  
Greater than ten years 1  
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 1  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Supporting remaining products    
Fair Value    
Less than one year 23  
One year through five years 1,005  
After five years through ten years 613  
Greater than ten years 236  
Fair Value 3,042  
Unrealized Losses    
Less than one year 0  
One year through five years 7  
After five years through ten years 11  
Greater than ten years 4  
Unrealized Losses 31  
Supporting remaining products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 398  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 3  
Supporting remaining products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 235  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 5  
Supporting remaining products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 532  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 1