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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Less than one year $ 36  
One year through five years 624  
After five years through ten years 504  
Greater than ten years 296  
Fair Value 2,259 $ 1,169
Unrealized Losses    
Less than one year 0  
One year through five years 7  
After five years through ten years 13  
Greater than ten years 8  
Unrealized Losses 38 11
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, maturity, without single maturity date, fair value 70  
Fair Value 70 16
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Unrealized Losses 0 0
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, maturity, without single maturity date, fair value 106  
Fair Value 106 49
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Unrealized Losses 0 0
Other asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, maturity, without single maturity date, fair value 623  
Fair Value 623 436
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 10  
Unrealized Losses 10 $ 5
Supporting experience-rated products    
Debt Securities, Available-for-sale [Line Items]    
Less than one year 0  
One year through five years 1  
After five years through ten years 11  
Greater than ten years 11  
Fair Value 32  
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    
Debt Securities, Available-for-sale [Line Items]    
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    
Debt Securities, Available-for-sale [Line Items]    
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    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, maturity, without single maturity date, fair value 7  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Supporting remaining products    
Debt Securities, Available-for-sale [Line Items]    
Less than one year 36  
One year through five years 623  
After five years through ten years 493  
Greater than ten years 285  
Fair Value 2,227  
Unrealized Losses    
Less than one year 0  
One year through five years 7  
After five years through ten years 12  
Greater than ten years 8  
Unrealized Losses 37  
Supporting remaining products | Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, maturity, without single maturity date, fair value 70  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Supporting remaining products | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, maturity, without single maturity date, fair value 104  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 0  
Supporting remaining products | Other asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, maturity, without single maturity date, fair value 616  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 10