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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Less than one year $ 48  
One year through five years 370  
After five years through ten years 326  
Greater than ten years 259  
Fair Value 1,768 $ 1,169
Unrealized Losses    
Less than one year 0  
One year through five years 9  
After five years through ten years 12  
Greater than ten years 10  
Unrealized Losses 53 11
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, maturity, without single maturity date, fair value 52  
Fair Value 52 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 65  
Fair Value 65 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 648  
Fair Value 648 436
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 22  
Unrealized Losses 22 $ 5
Supporting experience-rated products    
Debt Securities, Available-for-sale [Line Items]    
Less than one year 3  
One year through five years 5  
After five years through ten years 10  
Greater than ten years 3  
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 1  
Unrealized Losses 2  
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 0  
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 12  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 1  
Supporting remaining products    
Debt Securities, Available-for-sale [Line Items]    
Less than one year 45  
One year through five years 365  
After five years through ten years 316  
Greater than ten years 256  
Fair Value 1,735  
Unrealized Losses    
Less than one year 0  
One year through five years 9  
After five years through ten years 12  
Greater than ten years 9  
Unrealized Losses 51  
Supporting remaining products | Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, maturity, without single maturity date, fair value 52  
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 65  
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 636  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 21