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Investments - Available-for-Sale Investments (Details)
$ in Millions
Jun. 30, 2020
USD ($)
Security
Dec. 31, 2019
USD ($)
Security
Estimated Fair Value    
In a Continuous Loss Position for Less than 12 Months $ 116 $ 365
In a Continuous Loss Position for 12 Months or More 0 0
Unrealized Losses    
In a Continuous Loss Position for Less than 12 Months 5 2
In a Continuous Loss Position for 12 Months or More $ 0 $ 0
Total Number of Positions    
In a Continuous Loss Position for Less than 12 Months | Security 63 239
In a Continuous Loss Position for 12 Months or More | Security 0 0
Corporate debt securities    
Estimated Fair Value    
In a Continuous Loss Position for Less than 12 Months $ 63 $ 222
In a Continuous Loss Position for 12 Months or More 0 0
Unrealized Losses    
In a Continuous Loss Position for Less than 12 Months 2 1
In a Continuous Loss Position for 12 Months or More $ 0 $ 0
Total Number of Positions    
In a Continuous Loss Position for Less than 12 Months | Security 29 167
In a Continuous Loss Position for 12 Months or More | Security 0 0
Mortgage-backed securities    
Estimated Fair Value    
In a Continuous Loss Position for Less than 12 Months $ 53 $ 143
In a Continuous Loss Position for 12 Months or More 0 0
Unrealized Losses    
In a Continuous Loss Position for Less than 12 Months 3 1
In a Continuous Loss Position for 12 Months or More $ 0 $ 0
Total Number of Positions    
In a Continuous Loss Position for Less than 12 Months | Security 34 72
In a Continuous Loss Position for 12 Months or More | Security 0 0