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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, 2021
Dec. 31, 2020
Fixed maturities    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (23) $ (14)
Fair value - less than twelve months $ 3,270 $ 952
Fair value as percentage of cost - less than twelve months 99.00% 99.00%
Unrealized loss - twelve months or more $ (5) $ (7)
Fair value - twelve months or more $ 226 $ 497
Fair value as a percentage of cost - twelve months or more 98.00% 99.00%
U.S. Government and government agencies    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (1) $ 0
Fair value - less than twelve months $ 92 $ 23
Fair value as percentage of cost - less than twelve months 99.00% 100.00%
Unrealized loss - twelve months or more $ (1) $ 0
Fair value - twelve months or more $ 22 $ 0
Fair value as a percentage of cost - twelve months or more 96.00% 0.00%
States, municipalities and political subdivisions    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ 0 $ 0
Fair value - less than twelve months $ 9 $ 39
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 $ 13 $ 10
Fair value as a percentage of cost - twelve months or more 100.00% 100.00%
Foreign government    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (2) $ 0
Fair value - less than twelve months $ 160 $ 7
Fair value as percentage of cost - less than twelve months 99.00% 100.00%
Unrealized loss - twelve months or more $ 0 $ 0
Fair value - twelve months or more $ 0 $ 0
Fair value as a 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 $ (3) $ (1)
Fair value - less than twelve months $ 419 $ 86
Fair value as percentage of cost - less than twelve months 99.00% 99.00%
Unrealized loss - twelve months or more $ 0 $ 0
Fair value - twelve months or more $ 7 $ 7
Fair value as a 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 $ 34 $ 7
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 $ 5
Fair value as a percentage of cost - twelve months or more 0.00% 100.00%
Collateralized loan obligations    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (1) $ (1)
Fair value - less than twelve months $ 806 $ 192
Fair value as percentage of cost - less than twelve months 100.00% 99.00%
Unrealized loss - twelve months or more $ (1) $ (3)
Fair value - twelve months or more $ 77 $ 366
Fair value as a percentage of cost - twelve months or more 99.00% 99.00%
Other asset-backed securities    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (8) $ (10)
Fair value - less than twelve months $ 1,250 $ 465
Fair value as percentage of cost - less than twelve months 99.00% 98.00%
Unrealized loss - twelve months or more $ (3) $ (3)
Fair value - twelve months or more $ 81 $ 92
Fair value as a percentage of cost - twelve months or more 96.00% 97.00%
Corporate and other    
Available-for-sale securities in a continuous unrealized loss position    
Unrealized loss - less than twelve months $ (8) $ (2)
Fair value - less than twelve months $ 500 $ 133
Fair value as percentage of cost - less than twelve months 98.00% 99.00%
Unrealized loss - twelve months or more $ 0 $ (1)
Fair value - twelve months or more $ 26 $ 17
Fair value as a percentage of cost - twelve months or more 100.00% 94.00%