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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Fair Value    
Less than one year $ 9  
One year through five years 300  
After five years through ten years 169  
Greater than ten years 39  
Fair Value 915 $ 1,169
Unrealized Losses    
Less than one year 0  
One year through five years 4  
After five years through ten years 4  
Greater than ten years 1  
Unrealized Losses 11 11
Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 26  
Fair Value 26 16
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Unrealized Losses 0 0
Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 75  
Fair Value 75 49
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Unrealized Losses 0 0
Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 297  
Fair Value 297 436
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 2  
Unrealized Losses 2 $ 5
Supporting experience- rated products    
Fair Value    
Less than one year 0  
One year through five years 0  
After five years through ten years 4  
Greater than ten years 3  
Fair Value 14  
Unrealized Losses    
Less than one year 0  
One year through five years 0  
After five years through ten years 0  
Greater than ten years 0  
Unrealized Losses 0  
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 2  
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 5  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Supporting remaining products    
Fair Value    
Less than one year 9  
One year through five years 300  
After five years through ten years 165  
Greater than ten years 36  
Fair Value 901  
Unrealized Losses    
Less than one year 0  
One year through five years 4  
After five years through ten years 4  
Greater than ten years 1  
Unrealized Losses 11  
Supporting remaining products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 26  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Supporting remaining products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 73  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Supporting remaining products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 292  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 2