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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, 2022
Dec. 31, 2021
Fixed maturities    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (425) $ (23)
Fair value - less than twelve months $ 6,540 $ 3,270
Fair value as percentage of cost - less than twelve months 94.00% 99.00%
Unrealized loss - twelve months or more $ (244) $ (5)
Fair value - twelve months or more $ 2,344 $ 226
Fair value as a percentage of cost - twelve months or more 91.00% 98.00%
U.S. Government and government agencies    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (4) $ (1)
Fair value - less than twelve months $ 111 $ 92
Fair value as percentage of cost - less than twelve months 97.00% 99.00%
Unrealized loss - twelve months or more $ (10) $ (1)
Fair value - twelve months or more $ 107 $ 22
Fair value as a percentage of cost - twelve months or more 91.00% 96.00%
States, municipalities and political subdivisions    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (50) $ 0
Fair value - less than twelve months $ 967 $ 9
Fair value as percentage of cost - less than twelve months 95.00% 100.00%
Unrealized loss - twelve months or more $ (1) $ 0
Fair value - twelve months or more $ 15 $ 13
Fair value as a percentage of cost - twelve months or more 94.00% 100.00%
Foreign government    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (5) $ (2)
Fair value - less than twelve months $ 90 $ 160
Fair value as percentage of cost - less than twelve months 95.00% 99.00%
Unrealized loss - twelve months or more $ (9) $ 0
Fair value - twelve months or more $ 134 $ 0
Fair value as a percentage of cost - twelve months or more 94.00% 0.00%
Residential MBS    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (115) $ (3)
Fair value - less than twelve months $ 1,078 $ 419
Fair value as percentage of cost - less than twelve months 90.00% 99.00%
Unrealized loss - twelve months or more $ (65) $ 0
Fair value - twelve months or more $ 315 $ 7
Fair value as a percentage of cost - twelve months or more 83.00% 100.00%
Commercial MBS    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (2) $ 0
Fair value - less than twelve months $ 44 $ 34
Fair value as percentage of cost - less than twelve months 96.00% 100.00%
Unrealized loss - twelve months or more $ (1) $ 0
Fair value - twelve months or more $ 33 $ 0
Fair value as a percentage of cost - twelve months or more 97.00% 0.00%
Collateralized loan obligations    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (44) $ (1)
Fair value - less than twelve months $ 1,224 $ 806
Fair value as percentage of cost - less than twelve months 97.00% 100.00%
Unrealized loss - twelve months or more $ (23) $ (1)
Fair value - twelve months or more $ 587 $ 77
Fair value as a percentage of cost - twelve months or more 96.00% 99.00%
Other asset-backed securities    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (100) $ (8)
Fair value - less than twelve months $ 1,361 $ 1,250
Fair value as percentage of cost - less than twelve months 93.00% 99.00%
Unrealized loss - twelve months or more $ (84) $ (3)
Fair value - twelve months or more $ 740 $ 81
Fair value as a percentage of cost - twelve months or more 90.00% 96.00%
Corporate and other    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (105) $ (8)
Fair value - less than twelve months $ 1,665 $ 500
Fair value as percentage of cost - less than twelve months 94.00% 98.00%
Unrealized loss - twelve months or more $ (51) $ 0
Fair value - twelve months or more $ 413 $ 26
Fair value as a percentage of cost - twelve months or more 89.00% 100.00%