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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Fair Value    
Less than one year $ 12  
One year through five years 288  
After five years through ten years 160  
Greater than ten years 208  
Fair Value 1,169 $ 2,409
Unrealized Losses    
Less than one year 0  
One year through five years 1  
After five years through ten years 2  
Greater than ten years 3  
Unrealized Losses 11 36
Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 16  
Fair Value 16 1
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 49  
Fair Value 49  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Unrealized Losses 0  
Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 436  
Fair Value 436 528
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 5  
Unrealized Losses 5 $ 15
Supporting experience-rated products    
Fair Value    
Less than one year 0  
One year through five years 3  
After five years through ten years 9  
Greater than ten years 11  
Fair Value 33  
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 0  
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 10  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Supporting remaining products    
Fair Value    
Less than one year 12  
One year through five years 285  
After five years through ten years 151  
Greater than ten years 197  
Fair Value 1,136  
Unrealized Losses    
Less than one year 0  
One year through five years 1  
After five years through ten years 2  
Greater than ten years 3  
Unrealized Losses 11  
Supporting remaining products | Residential mortgage-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 0  
Supporting remaining products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 49  
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 426  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 5