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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
Mar. 31, 2022
Dec. 31, 2021
Total fixed maturities    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (203) $ (23)
Fair value - less than twelve months $ 6,645 $ 3,270
Fair value as percentage of cost - Less than twelve months 97.00% 99.00%
Unrealized Loss - Twelve months or more $ (17) $ (5)
Fair Value - Twelve months or more $ 312 $ 226
Fair value as percentage of cost - Twelve months or more 95.00% 98.00%
U.S. Government and government agencies    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (3) $ (1)
Fair value - less than twelve months $ 114 $ 92
Fair value as percentage of cost - Less than twelve months 97.00% 99.00%
Unrealized Loss - Twelve months or more $ (5) $ (1)
Fair Value - Twelve months or more $ 61 $ 22
Fair value as percentage of cost - Twelve months or more 92.00% 96.00%
States, municipalities and political subdivisions    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (12) $ 0
Fair value - less than twelve months $ 444 $ 9
Fair value as percentage of cost - Less than twelve months 97.00% 100.00%
Unrealized Loss - Twelve months or more $ (1) $ 0
Fair Value - Twelve months or more $ 12 $ 13
Fair value as percentage of cost - Twelve months or more 92.00% 100.00%
Foreign government    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (9) $ (2)
Fair value - less than twelve months $ 241 $ 160
Fair value as percentage of cost - Less than twelve months 96.00% 99.00%
Unrealized Loss - Twelve months or more $ 0 $ 0
Fair Value - Twelve months or more $ 0 $ 0
Fair value as percentage of cost - Twelve months or more 0.00% 0.00%
Residential MBS    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (55) $ (3)
Fair value - less than twelve months $ 1,213 $ 419
Fair value as percentage of cost - Less than twelve months 96.00% 99.00%
Unrealized Loss - Twelve months or more $ 0 $ 0
Fair Value - Twelve months or more $ 11 $ 7
Fair value as percentage of cost - Twelve months or more 100.00% 100.00%
Commercial MBS    
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 $ 34
Fair value as percentage of cost - Less than twelve months 100.00% 100.00%
Unrealized Loss - Twelve months or more $ 0 $ 0
Fair Value - Twelve months or more $ 0 $ 0
Fair value as percentage of cost - Twelve months or more 0.00% 0.00%
Collateralized loan obligations    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (12) $ (1)
Fair value - less than twelve months $ 1,302 $ 806
Fair value as percentage of cost - Less than twelve months 99.00% 100.00%
Unrealized Loss - Twelve months or more $ (2) $ (1)
Fair Value - Twelve months or more $ 78 $ 77
Fair value as percentage of cost - Twelve months or more 98.00% 99.00%
Other asset-backed securities    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (63) $ (8)
Fair value - less than twelve months $ 2,053 $ 1,250
Fair value as percentage of cost - Less than twelve months 97.00% 99.00%
Unrealized Loss - Twelve months or more $ (5) $ (3)
Fair Value - Twelve months or more $ 82 $ 81
Fair value as percentage of cost - Twelve months or more 94.00% 96.00%
Corporate and other    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (49) $ (8)
Fair value - less than twelve months $ 1,226 $ 500
Fair value as percentage of cost - Less than twelve months 96.00% 98.00%
Unrealized Loss - Twelve months or more $ (4) $ 0
Fair Value - Twelve months or more $ 68 $ 26
Fair value as percentage of cost - Twelve months or more 94.00% 100.00%