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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, 2024
Dec. 31, 2023
Total fixed maturities    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (9) $ (7)
Fair value - less than twelve months $ 936 $ 428
Fair value as percentage of cost - Less than twelve months 99.00% 98.00%
Unrealized Loss - Twelve months or more $ (439) $ (463)
Fair Value - Twelve months or more $ 5,407 $ 5,999
Fair value as percentage of cost - Twelve months or more 92.00% 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 $ 27 $ 11
Fair value as percentage of cost - Less than twelve months 100.00% 100.00%
Unrealized Loss - Twelve months or more $ (7) $ (8)
Fair Value - Twelve months or more $ 150 $ 191
Fair value as percentage of cost - Twelve months or more 96.00% 96.00%
States, municipalities and political subdivisions    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (2) $ (1)
Fair value - less than twelve months $ 184 $ 76
Fair value as percentage of cost - Less than twelve months 99.00% 99.00%
Unrealized Loss - Twelve months or more $ (43) $ (37)
Fair Value - Twelve months or more $ 529 $ 526
Fair value as percentage of cost - Twelve months or more 92.00% 93.00%
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 $ 17 $ 0
Fair value as percentage of cost - Less than twelve months 100.00% 0.00%
Unrealized Loss - Twelve months or more $ (5) $ (7)
Fair Value - Twelve months or more $ 206 $ 207
Fair value as percentage of cost - Twelve months or more 98.00% 97.00%
Residential MBS    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (1) $ (1)
Fair value - less than twelve months $ 127 $ 42
Fair value as percentage of cost - Less than twelve months 99.00% 98.00%
Unrealized Loss - Twelve months or more $ (155) $ (154)
Fair Value - Twelve months or more $ 1,017 $ 1,089
Fair value as percentage of cost - Twelve months or more 87.00% 88.00%
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 $ 0 $ 0
Fair value as percentage of cost - Less than twelve months 0.00% 0.00%
Unrealized Loss - Twelve months or more $ 0 $ (1)
Fair Value - Twelve months or more $ 42 $ 61
Fair value as percentage of cost - Twelve months or more 100.00% 98.00%
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 $ 70 $ 25
Fair value as percentage of cost - Less than twelve months 100.00% 100.00%
Unrealized Loss - Twelve months or more $ (22) $ (28)
Fair Value - Twelve months or more $ 456 $ 807
Fair value as percentage of cost - Twelve months or more 95.00% 97.00%
Other asset-backed securities    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (1) $ (1)
Fair value - less than twelve months $ 103 $ 151
Fair value as percentage of cost - Less than twelve months 99.00% 99.00%
Unrealized Loss - Twelve months or more $ (101) $ (119)
Fair Value - Twelve months or more $ 1,591 $ 1,663
Fair value as percentage of cost - Twelve months or more 94.00% 93.00%
Corporate and other    
Available for sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (5) $ (4)
Fair value - less than twelve months $ 408 $ 123
Fair value as percentage of cost - Less than twelve months 99.00% 97.00%
Unrealized Loss - Twelve months or more $ (106) $ (109)
Fair Value - Twelve months or more $ 1,416 $ 1,455
Fair value as percentage of cost - Twelve months or more 93.00% 93.00%