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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, 2023
Dec. 31, 2022
Total fixed maturities    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (106) $ (425)
Fair value - less than twelve months $ 3,184 $ 6,540
Fair value as percentage of cost - Less than twelve months 97.00% 94.00%
Unrealized Loss - Twelve months or more $ (471) $ (244)
Fair Value - Twelve months or more $ 4,908 $ 2,344
Fair value as percentage of cost - Twelve months or more 91.00% 91.00%
U.S. government and government agencies    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (1) $ (4)
Fair value - less than twelve months $ 43 $ 111
Fair value as percentage of cost - Less than twelve months 98.00% 97.00%
Unrealized Loss - Twelve months or more $ (10) $ (10)
Fair Value - Twelve months or more $ 173 $ 107
Fair value as percentage of cost - Twelve months or more 95.00% 91.00%
States, municipalities and political subdivisions    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (17) $ (50)
Fair value - less than twelve months $ 468 $ 967
Fair value as percentage of cost - Less than twelve months 96.00% 95.00%
Unrealized Loss - Twelve months or more $ (18) $ (1)
Fair Value - Twelve months or more $ 240 $ 15
Fair value as percentage of cost - Twelve months or more 93.00% 94.00%
Foreign government    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (2) $ (5)
Fair value - less than twelve months $ 14 $ 90
Fair value as percentage of cost - Less than twelve months 88.00% 95.00%
Unrealized Loss - Twelve months or more $ (10) $ (9)
Fair Value - Twelve months or more $ 209 $ 134
Fair value as percentage of cost - Twelve months or more 95.00% 94.00%
Residential MBS    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (18) $ (115)
Fair value - less than twelve months $ 397 $ 1,078
Fair value as percentage of cost - Less than twelve months 96.00% 90.00%
Unrealized Loss - Twelve months or more $ (157) $ (65)
Fair Value - Twelve months or more $ 939 $ 315
Fair value as percentage of cost - Twelve months or more 86.00% 83.00%
Commercial MBS    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ 0 $ (2)
Fair value - less than twelve months $ 20 $ 44
Fair value as percentage of cost - Less than twelve months 100.00% 96.00%
Unrealized Loss - Twelve months or more $ (2) $ (1)
Fair Value - Twelve months or more $ 49 $ 33
Fair value as percentage of cost - Twelve months or more 96.00% 97.00%
Collateralized loan obligations    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (12) $ (44)
Fair value - less than twelve months $ 697 $ 1,224
Fair value as percentage of cost - Less than twelve months 98.00% 97.00%
Unrealized Loss - Twelve months or more $ (41) $ (23)
Fair Value - Twelve months or more $ 908 $ 587
Fair value as percentage of cost - Twelve months or more 96.00% 96.00%
Other asset-backed securities    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (17) $ (100)
Fair value - less than twelve months $ 600 $ 1,361
Fair value as percentage of cost - Less than twelve months 97.00% 93.00%
Unrealized Loss - Twelve months or more $ (131) $ (84)
Fair Value - Twelve months or more $ 1,457 $ 740
Fair value as percentage of cost - Twelve months or more 92.00% 90.00%
Corporate and other    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (39) $ (105)
Fair value - less than twelve months $ 945 $ 1,665
Fair value as percentage of cost - Less than twelve months 96.00% 94.00%
Unrealized Loss - Twelve months or more $ (102) $ (51)
Fair Value - Twelve months or more $ 933 $ 413
Fair value as percentage of cost - Twelve months or more 90.00% 89.00%