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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, 2022
Dec. 31, 2021
Total fixed maturities    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (635) $ (23)
Fair value - less than twelve months $ 8,311 $ 3,270
Fair value as percentage of cost - Less than twelve months 93.00% 99.00%
Unrealized Loss - Twelve months or more $ (93) $ (5)
Fair Value - Twelve months or more $ 1,073 $ 226
Fair value as percentage of cost - Twelve months or more 92.00% 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 $ 108 $ 92
Fair value as percentage of cost - Less than twelve months 96.00% 99.00%
Unrealized Loss - Twelve months or more $ (11) $ (1)
Fair Value - Twelve months or more $ 106 $ 22
Fair value as 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 $ (98) $ 0
Fair value - less than twelve months $ 1,124 $ 9
Fair value as percentage of cost - Less than twelve months 92.00% 100.00%
Unrealized Loss - Twelve months or more $ (2) $ 0
Fair Value - Twelve months or more $ 14 $ 13
Fair value as percentage of cost - Twelve months or more 88.00% 100.00%
Foreign government    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (7) $ (2)
Fair value - less than twelve months $ 145 $ 160
Fair value as percentage of cost - Less than twelve months 95.00% 99.00%
Unrealized Loss - Twelve months or more $ (5) $ 0
Fair Value - Twelve months or more $ 61 $ 0
Fair value as percentage of cost - Twelve months or more 92.00% 0.00%
Residential MBS    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (174) $ (3)
Fair value - less than twelve months $ 1,421 $ 419
Fair value as percentage of cost - Less than twelve months 89.00% 99.00%
Unrealized Loss - Twelve months or more $ (2) $ 0
Fair Value - Twelve months or more $ 19 $ 7
Fair value as percentage of cost - Twelve months or more 90.00% 100.00%
Commercial MBS    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (3) $ 0
Fair value - less than twelve months $ 68 $ 34
Fair value as percentage of cost - Less than twelve months 96.00% 100.00%
Unrealized Loss - Twelve months or more $ 0 $ 0
Fair Value - Twelve months or more $ 10 $ 0
Fair value as percentage of cost - Twelve months or more 100.00% 0.00%
Collateralized loan obligations    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (61) $ (1)
Fair value - less than twelve months $ 1,465 $ 806
Fair value as percentage of cost - Less than twelve months 96.00% 100.00%
Unrealized Loss - Twelve months or more $ (11) $ (1)
Fair Value - Twelve months or more $ 329 $ 77
Fair value as percentage of cost - Twelve months or more 97.00% 99.00%
Other asset-backed securities    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (137) $ (8)
Fair value - less than twelve months $ 1,806 $ 1,250
Fair value as percentage of cost - Less than twelve months 93.00% 99.00%
Unrealized Loss - Twelve months or more $ (34) $ (3)
Fair Value - Twelve months or more $ 326 $ 81
Fair value as percentage of cost - Twelve months or more 91.00% 96.00%
Corporate and other    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (151) $ (8)
Fair value - less than twelve months $ 2,174 $ 500
Fair value as percentage of cost - Less than twelve months 94.00% 98.00%
Unrealized Loss - Twelve months or more $ (28) $ 0
Fair Value - Twelve months or more $ 208 $ 26
Fair value as percentage of cost - Twelve months or more 88.00% 100.00%