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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Less than one year $ 170  
One year through five years 1,112  
After five years through ten years 837  
Greater than ten years 570  
Fair Value 3,700 $ 1,169
Unrealized Losses    
Less than one year 3  
One year through five years 45  
After five years through ten years 64  
Greater than ten years 53  
Unrealized Losses 246 11
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, maturity, without single maturity date, fair value 50  
Fair Value 50 49
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 1  
Unrealized Losses 1 0
Other asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, maturity, without single maturity date, fair value 961  
Fair Value 961 436
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 80  
Unrealized Losses 80 $ 5
Supporting experience-rated products    
Debt Securities, Available-for-sale [Line Items]    
Less than one year 7  
One year through five years 30  
After five years through ten years 61  
Greater than ten years 55  
Fair Value 170  
Unrealized Losses    
Less than one year 0  
One year through five years 1  
After five years through ten years 4  
Greater than ten years 4  
Unrealized Losses 10  
Supporting experience-rated products | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, maturity, without single maturity date, fair value 1  
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 16  
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 163  
One year through five years 1,082  
After five years through ten years 776  
Greater than ten years 515  
Fair Value 3,530  
Unrealized Losses    
Less than one year 3  
One year through five years 44  
After five years through ten years 60  
Greater than ten years 49  
Unrealized Losses 236  
Supporting remaining products | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, maturity, without single maturity date, fair value 49  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 1  
Supporting remaining products | Other asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, maturity, without single maturity date, fair value 945  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 79