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Investments - Gross unrealized losses on securities by investment category and length of time that have been in a continuous unrealized loss position (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Total fixed maturities    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ 9 $ 14
Fair value - less than twelve months $ 1,019 $ 952
Fair value as percentage of cost - Less than twelve months 99.00% 99.00%
Unrealized Loss - Twelve months or more $ (7) $ (7)
Fair Value - Twelve months or more $ 630 $ 497
Fair value as percentage of cost - Twelve months or more 99.00% 99.00%
U.S. Government and government agencies    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ 1 $ 0
Fair value - less than twelve months $ 105 $ 23
Fair value as percentage of cost - Less than twelve months 99.00% 100.00%
Unrealized Loss - Twelve months or more $ 0 $ 0
Fair Value - Twelve months or more $ 0 $ 0
Fair value as percentage of cost - Twelve months or more 0.00% 0.00%
States, municipalities and political subdivisions    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ 0 $ 0
Fair value - less than twelve months $ 29 $ 39
Fair value as percentage of cost - Less than twelve months 100.00% 100.00%
Unrealized Loss - Twelve months or more $ 0 $ 0
Fair Value - Twelve months or more $ 18 $ 10
Fair value as percentage of cost - Twelve months or more 100.00% 100.00%
Foreign government    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ 0 $ 0
Fair value - less than twelve months $ 35 $ 7
Fair value as percentage of cost - Less than twelve months 100.00% 100.00%
Unrealized Loss - Twelve months or more $ 0 $ 0
Fair Value - Twelve months or more $ 0 $ 0
Fair value as percentage of cost - Twelve months or more 0.00% 0.00%
Residential MBS    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ 1 $ 1
Fair value - less than twelve months $ 86 $ 86
Fair value as percentage of cost - Less than twelve months 99.00% 99.00%
Unrealized Loss - Twelve months or more $ (1) $ 0
Fair Value - Twelve months or more $ 11 $ 7
Fair value as percentage of cost - Twelve months or more 92.00% 100.00%
Commercial MBS    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ 0 $ 0
Fair value - less than twelve months $ 14 $ 7
Fair value as percentage of cost - Less than twelve months 100.00% 100.00%
Unrealized Loss - Twelve months or more $ 0 $ 0
Fair Value - Twelve months or more $ 5 $ 5
Fair value as percentage of cost - Twelve months or more 100.00% 100.00%
Collateralized loan obligations    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ 1 $ 1
Fair value - less than twelve months $ 113 $ 192
Fair value as percentage of cost - Less than twelve months 99.00% 99.00%
Unrealized Loss - Twelve months or more $ (2) $ (3)
Fair Value - Twelve months or more $ 354 $ 366
Fair value as percentage of cost - Twelve months or more 99.00% 99.00%
Other asset-backed securities    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ 3 $ 10
Fair value - less than twelve months $ 382 $ 465
Fair value as percentage of cost - Less than twelve months 99.00% 98.00%
Unrealized Loss - Twelve months or more $ (3) $ (3)
Fair Value - Twelve months or more $ 187 $ 92
Fair value as percentage of cost - Twelve months or more 98.00% 97.00%
Corporate and other    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ 3 $ 2
Fair value - less than twelve months $ 255 $ 133
Fair value as percentage of cost - Less than twelve months 99.00% 99.00%
Unrealized Loss - Twelve months or more $ (1) $ (1)
Fair Value - Twelve months or more $ 55 $ 17
Fair value as percentage of cost - Twelve months or more 98.00% 94.00%