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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
Jun. 30, 2021
Dec. 31, 2020
Total fixed maturities    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (6) $ (14)
Fair value - less than twelve months $ 936 $ 952
Fair value as percentage of cost - Less than twelve months 99.00% 99.00%
Unrealized Loss - Twelve months or more $ (6) $ (7)
Fair Value - Twelve months or more $ 409 $ 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 $ 109 $ 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 $ 6 $ 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 $ 17 $ 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 $ 82 $ 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 $ 10 $ 7
Fair value as percentage of cost - Twelve months or more 91.00% 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 $ 0 $ 7
Fair value as percentage of cost - Less than twelve months 0.00% 100.00%
Unrealized Loss - Twelve months or more $ 0 $ 0
Fair Value - Twelve months or more $ 0 $ 5
Fair value as percentage of cost - Twelve months or more 0.00% 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 $ 297 $ 192
Fair value as percentage of cost - Less than twelve months 100.00% 99.00%
Unrealized Loss - Twelve months or more $ (1) $ (3)
Fair Value - Twelve months or more $ 235 $ 366
Fair value as percentage of cost - Twelve months or more 100.00% 99.00%
Other asset-backed securities    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (1) $ (10)
Fair value - less than twelve months $ 288 $ 465
Fair value as percentage of cost - Less than twelve months 100.00% 98.00%
Unrealized Loss - Twelve months or more $ (3) $ (3)
Fair Value - Twelve months or more $ 92 $ 92
Fair value as percentage of cost - Twelve months or more 97.00% 97.00%
Corporate and other    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (2) $ (2)
Fair value - less than twelve months $ 119 $ 133
Fair value as percentage of cost - Less than twelve months 98.00% 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%