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Investments - Available-for-Sale Investments (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Security
Dec. 31, 2018
USD ($)
Security
Estimated Fair Value    
In a Continuous Loss Position for Less than 12 Months $ 151 $ 509
In a Continuous Loss Position for 12 Months or More 0 694
Unrealized Losses    
In a Continuous Loss Position for Less than 12 Months 1 3
In a Continuous Loss Position for 12 Months or More $ 0 $ 8
Total Number of Positions    
In a Continuous Loss Position for Less than 12 Months | Security 90 285
In a Continuous Loss Position for 12 Months or More | Security 0 516
Corporate debt securities    
Estimated Fair Value    
In a Continuous Loss Position for Less than 12 Months $ 151 $ 509
In a Continuous Loss Position for 12 Months or More 0 412
Unrealized Losses    
In a Continuous Loss Position for Less than 12 Months 1 3
In a Continuous Loss Position for 12 Months or More $ 0 $ 5
Total Number of Positions    
In a Continuous Loss Position for Less than 12 Months | Security 90 285
In a Continuous Loss Position for 12 Months or More | Security 0 298
Asset-backed securities    
Estimated Fair Value    
In a Continuous Loss Position for Less than 12 Months   $ 0
In a Continuous Loss Position for 12 Months or More   68
Unrealized Losses    
In a Continuous Loss Position for Less than 12 Months   0
In a Continuous Loss Position for 12 Months or More   $ 1
Total Number of Positions    
In a Continuous Loss Position for Less than 12 Months | Security   0
In a Continuous Loss Position for 12 Months or More | Security   52
GSEs    
Estimated Fair Value    
In a Continuous Loss Position for Less than 12 Months   $ 0
In a Continuous Loss Position for 12 Months or More   127
Unrealized Losses    
In a Continuous Loss Position for Less than 12 Months   0
In a Continuous Loss Position for 12 Months or More   $ 1
Total Number of Positions    
In a Continuous Loss Position for Less than 12 Months | Security   0
In a Continuous Loss Position for 12 Months or More | Security   76
Municipal securities    
Estimated Fair Value    
In a Continuous Loss Position for Less than 12 Months   $ 0
In a Continuous Loss Position for 12 Months or More   87
Unrealized Losses    
In a Continuous Loss Position for Less than 12 Months   0
In a Continuous Loss Position for 12 Months or More   $ 1
Total Number of Positions    
In a Continuous Loss Position for Less than 12 Months | Security   0
In a Continuous Loss Position for 12 Months or More | Security   90