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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
Dec. 31, 2023
Dec. 31, 2022
Fixed maturities    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (7) $ (425)
Fair value - less than twelve months $ 428 $ 6,540
Fair value as percentage of cost - less than twelve months 98.00% 94.00%
Unrealized loss - twelve months or more $ (463) $ (244)
Fair value - twelve months or more $ 5,999 $ 2,344
Fair value as a percentage of cost - twelve months or more 93.00% 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 $ 11 $ 111
Fair value as percentage of cost - less than twelve months 100.00% 97.00%
Unrealized loss - twelve months or more $ (8) $ (10)
Fair value - twelve months or more $ 191 $ 107
Fair value as a percentage of cost - twelve months or more 96.00% 91.00%
States, municipalities and political subdivisions    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (1) $ (50)
Fair value - less than twelve months $ 76 $ 967
Fair value as percentage of cost - less than twelve months 99.00% 95.00%
Unrealized loss - twelve months or more $ (37) $ (1)
Fair value - twelve months or more $ 526 $ 15
Fair value as a 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 $ 0 $ (5)
Fair value - less than twelve months $ 0 $ 90
Fair value as percentage of cost - less than twelve months 0.00% 95.00%
Unrealized loss - twelve months or more $ (7) $ (9)
Fair value - twelve months or more $ 207 $ 134
Fair value as a percentage of cost - twelve months or more 97.00% 94.00%
Residential MBS    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (1) $ (115)
Fair value - less than twelve months $ 42 $ 1,078
Fair value as percentage of cost - less than twelve months 98.00% 90.00%
Unrealized loss - twelve months or more $ (154) $ (65)
Fair value - twelve months or more $ 1,089 $ 315
Fair value as a percentage of cost - twelve months or more 88.00% 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 $ (1) $ (1)
Fair value - twelve months or more $ 61 $ 33
Fair value as a percentage of cost - twelve months or more 98.00% 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 $ 25 $ 1,224
Fair value as percentage of cost - less than twelve months 100.00% 97.00%
Unrealized loss - twelve months or more $ (28) $ (23)
Fair value - twelve months or more $ 807 $ 587
Fair value as a percentage of cost - twelve months or more 97.00% 96.00%
Other asset-backed securities    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (1) $ (100)
Fair value - less than twelve months $ 151 $ 1,361
Fair value as percentage of cost - less than twelve months 99.00% 93.00%
Unrealized loss - twelve months or more $ (119) $ (84)
Fair value - twelve months or more $ 1,663 $ 740
Fair value as a percentage of cost - twelve months or more 93.00% 90.00%
Corporate and other    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (4) $ (105)
Fair value - less than twelve months $ 123 $ 1,665
Fair value as percentage of cost - less than twelve months 97.00% 94.00%
Unrealized loss - twelve months or more $ (109) $ (51)
Fair value - twelve months or more $ 1,455 $ 413
Fair value as a percentage of cost - twelve months or more 93.00% 89.00%