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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
Sep. 30, 2023
Dec. 31, 2022
Total fixed maturities    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (59) $ (425)
Fair value - less than twelve months $ 2,119 $ 6,540
Fair value as percentage of cost - Less than twelve months 97.00% 94.00%
Unrealized Loss - Twelve months or more $ (632) $ (244)
Fair Value - Twelve months or more $ 6,328 $ 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 $ 0 $ (4)
Fair value - less than twelve months $ 36 $ 111
Fair value as percentage of cost - Less than twelve months 100.00% 97.00%
Unrealized Loss - Twelve months or more $ (11) $ (10)
Fair Value - Twelve months or more $ 192 $ 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 $ (12) $ (50)
Fair value - less than twelve months $ 232 $ 967
Fair value as percentage of cost - Less than twelve months 95.00% 95.00%
Unrealized Loss - Twelve months or more $ (64) $ (1)
Fair Value - Twelve months or more $ 565 $ 15
Fair value as percentage of cost - Twelve months or more 90.00% 94.00%
Foreign government    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ 0 $ (5)
Fair value - less than twelve months $ 7 $ 90
Fair value as percentage of cost - Less than twelve months 100.00% 95.00%
Unrealized Loss - Twelve months or more $ (10) $ (9)
Fair Value - Twelve months or more $ 211 $ 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 $ (7) $ (115)
Fair value - less than twelve months $ 318 $ 1,078
Fair value as percentage of cost - Less than twelve months 98.00% 90.00%
Unrealized Loss - Twelve months or more $ (205) $ (65)
Fair Value - Twelve months or more $ 1,121 $ 315
Fair value as percentage of cost - Twelve months or more 85.00% 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 $ 0 $ 44
Fair value as percentage of cost - Less than twelve months 0.00% 96.00%
Unrealized Loss - Twelve months or more $ (2) $ (1)
Fair Value - Twelve months or more $ 63 $ 33
Fair value as percentage of cost - Twelve months or more 97.00% 97.00%
Collateralized loan obligations    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ 0 $ (44)
Fair value - less than twelve months $ 39 $ 1,224
Fair value as percentage of cost - Less than twelve months 100.00% 97.00%
Unrealized Loss - Twelve months or more $ (39) $ (23)
Fair Value - Twelve months or more $ 1,026 $ 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 $ (6) $ (100)
Fair value - less than twelve months $ 402 $ 1,361
Fair value as percentage of cost - Less than twelve months 99.00% 93.00%
Unrealized Loss - Twelve months or more $ (155) $ (84)
Fair Value - Twelve months or more $ 1,677 $ 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 $ (34) $ (105)
Fair value - less than twelve months $ 1,085 $ 1,665
Fair value as percentage of cost - Less than twelve months 97.00% 94.00%
Unrealized Loss - Twelve months or more $ (146) $ (51)
Fair Value - Twelve months or more $ 1,473 $ 413
Fair value as percentage of cost - Twelve months or more 91.00% 89.00%