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Investments (Securities in a gross unrealized loss position) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months $ 9,019 $ 3,483
Gross Unrealized Losses, Less than 12 Months 267 74
Estimated Fair Value, 12 Months or Longer 18,319 22,248
Gross Unrealized Losses, 12 Months or Longer 2,773 2,921
Estimated Fair Value, Total 27,338 25,731
Gross Unrealized Losses, Total 3,040 2,995
Corporate and other bonds    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 5,846 1,943
Gross Unrealized Losses, Less than 12 Months 165 37
Estimated Fair Value, 12 Months or Longer 10,388 13,406
Gross Unrealized Losses, 12 Months or Longer 1,140 1,308
Estimated Fair Value, Total 16,234 15,349
Gross Unrealized Losses, Total 1,305 1,345
States, municipalities and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 1,247 598
Gross Unrealized Losses, Less than 12 Months 52 18
Estimated Fair Value, 12 Months or Longer 2,967 3,104
Gross Unrealized Losses, 12 Months or Longer 783 685
Estimated Fair Value, Total 4,214 3,702
Gross Unrealized Losses, Total 835 703
Residential mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 849 233
Gross Unrealized Losses, Less than 12 Months 22 4
Estimated Fair Value, 12 Months or Longer 2,010 2,212
Gross Unrealized Losses, 12 Months or Longer 466 421
Estimated Fair Value, Total 2,859 2,445
Gross Unrealized Losses, Total 488 425
Commercial mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 230 200
Gross Unrealized Losses, Less than 12 Months 3 5
Estimated Fair Value, 12 Months or Longer 988 1,184
Gross Unrealized Losses, 12 Months or Longer 139 225
Estimated Fair Value, Total 1,218 1,384
Gross Unrealized Losses, Total 142 230
Other asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 680 392
Gross Unrealized Losses, Less than 12 Months 21 8
Estimated Fair Value, 12 Months or Longer 1,557 1,869
Gross Unrealized Losses, 12 Months or Longer 218 248
Estimated Fair Value, Total 2,237 2,261
Gross Unrealized Losses, Total 239 256
Asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 1,759 825
Gross Unrealized Losses, Less than 12 Months 46 17
Estimated Fair Value, 12 Months or Longer 4,555 5,265
Gross Unrealized Losses, 12 Months or Longer 823 894
Estimated Fair Value, Total 6,314 6,090
Gross Unrealized Losses, Total 869 911
U.S. Treasury and obligations of government-sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 49 65
Gross Unrealized Losses, Less than 12 Months 1 1
Estimated Fair Value, 12 Months or Longer 41 23
Gross Unrealized Losses, 12 Months or Longer 0 1
Estimated Fair Value, Total 90 88
Gross Unrealized Losses, Total 1 2
Foreign government    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 118 52
Gross Unrealized Losses, Less than 12 Months 3 1
Estimated Fair Value, 12 Months or Longer 368 450
Gross Unrealized Losses, 12 Months or Longer 27 33
Estimated Fair Value, Total 486 502
Gross Unrealized Losses, Total $ 30 $ 34