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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, 2025
Dec. 31, 2024
Fixed maturities    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (7) $ (25)
Fair value - less than twelve months $ 909 $ 1,778
Fair value as percentage of cost - less than twelve months 99.00% 99.00%
Unrealized loss - twelve months or more $ (186) $ (328)
Fair value - twelve months or more $ 3,133 $ 4,156
Fair value as a percentage of cost - twelve months or more 94.00% 93.00%
U.S. government and government agencies    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ 0 $ 0
Fair value - less than twelve months $ 15 $ 35
Fair value as percentage of cost - less than twelve months 100.00% 100.00%
Unrealized loss - twelve months or more $ 0 $ (3)
Fair value - twelve months or more $ 44 $ 105
Fair value as a percentage of cost - twelve months or more 100.00% 97.00%
States, municipalities and political subdivisions    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ 0 $ (5)
Fair value - less than twelve months $ 47 $ 256
Fair value as percentage of cost - less than twelve months 100.00% 98.00%
Unrealized loss - twelve months or more $ (26) $ (44)
Fair value - twelve months or more $ 426 $ 470
Fair value as a percentage of cost - twelve months or more 94.00% 91.00%
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 $ 52 $ 98
Fair value as percentage of cost - less than twelve months 100.00% 100.00%
Unrealized loss - twelve months or more $ 0 $ (1)
Fair value - twelve months or more $ 5 $ 50
Fair value as a percentage of cost - twelve months or more 100.00% 98.00%
Residential MBS    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (4) $ (6)
Fair value - less than twelve months $ 186 $ 452
Fair value as percentage of cost - less than twelve months 98.00% 99.00%
Unrealized loss - twelve months or more $ (99) $ (148)
Fair value - twelve months or more $ 914 $ 916
Fair value as a percentage of cost - twelve months or more 90.00% 86.00%
Collateralized loan obligations    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ 0 $ 0
Fair value - less than twelve months $ 124 $ 0
Fair value as percentage of cost - less than twelve months 100.00% 0.00%
Unrealized loss - twelve months or more $ (3) $ (12)
Fair value - twelve months or more $ 147 $ 247
Fair value as a percentage of cost - twelve months or more 98.00% 95.00%
Other asset-backed securities    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (1) $ (4)
Fair value - less than twelve months $ 311 $ 332
Fair value as percentage of cost - less than twelve months 100.00% 99.00%
Unrealized loss - twelve months or more $ (37) $ (65)
Fair value - twelve months or more $ 803 $ 1,217
Fair value as a percentage of cost - twelve months or more 96.00% 95.00%
Corporate and other    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (2) $ (10)
Fair value - less than twelve months $ 174 $ 605
Fair value as percentage of cost - less than twelve months 99.00% 98.00%
Unrealized loss - twelve months or more $ (21) $ (55)
Fair value - twelve months or more $ 794 $ 1,151
Fair value as a percentage of cost - twelve months or more 97.00% 95.00%