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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, 2025
Dec. 31, 2024
Total fixed maturities    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (5) $ (25)
Fair value - less than twelve months $ 554 $ 1,778
Fair value as percentage of cost - less than twelve months 99.00% 99.00%
Unrealized Loss - twelve months or more $ (216) $ (328)
Fair Value - twelve months or more $ 3,413 $ 4,156
Fair value as 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 $ 8 $ 35
Fair value as percentage of cost - less than twelve months 100.00% 100.00%
Unrealized Loss - twelve months or more $ (1) $ (3)
Fair Value - twelve months or more $ 66 $ 105
Fair value as percentage of cost - twelve months or more 99.00% 97.00%
States, municipalities and political subdivisions    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (2) $ (5)
Fair value - less than twelve months $ 86 $ 256
Fair value as percentage of cost - less than twelve months 98.00% 98.00%
Unrealized Loss - twelve months or more $ (30) $ (44)
Fair Value - twelve months or more $ 429 $ 470
Fair value as percentage of cost - twelve months or more 93.00% 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 $ 8 $ 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 $ 42 $ 50
Fair value as 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 $ (1) $ (6)
Fair value - less than twelve months $ 145 $ 452
Fair value as percentage of cost - less than twelve months 99.00% 99.00%
Unrealized Loss - twelve months or more $ (112) $ (148)
Fair Value - twelve months or more $ 935 $ 916
Fair value as percentage of cost - twelve months or more 89.00% 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 $ 25 $ 0
Fair value as percentage of cost - less than twelve months 100.00% 0.00%
Unrealized Loss - twelve months or more $ (5) $ (12)
Fair Value - twelve months or more $ 178 $ 247
Fair value as percentage of cost - twelve months or more 97.00% 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 $ 161 $ 332
Fair value as percentage of cost - less than twelve months 99.00% 99.00%
Unrealized Loss - twelve months or more $ (43) $ (65)
Fair Value - twelve months or more $ 891 $ 1,217
Fair value as percentage of cost - twelve months or more 95.00% 95.00%
Corporate and other    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (1) $ (10)
Fair value - less than twelve months $ 121 $ 605
Fair value as percentage of cost - less than twelve months 99.00% 98.00%
Unrealized Loss - twelve months or more $ (25) $ (55)
Fair Value - twelve months or more $ 872 $ 1,151
Fair value as percentage of cost - twelve months or more 97.00% 95.00%