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Investments (Securities in a gross unrealized loss position) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months $ 2,623 $ 3,483
Gross Unrealized Losses, Less than 12 Months 47 74
Estimated Fair Value, 12 Months or Longer 19,777 22,248
Gross Unrealized Losses, 12 Months or Longer 2,189 2,921
Estimated Fair Value, Total 22,400 25,731
Gross Unrealized Losses, Total 2,236 2,995
Corporate and other bonds    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 1,664 1,943
Gross Unrealized Losses, Less than 12 Months 31 37
Estimated Fair Value, 12 Months or Longer 11,240 13,406
Gross Unrealized Losses, 12 Months or Longer 869 1,308
Estimated Fair Value, Total 12,904 15,349
Gross Unrealized Losses, Total 900 1,345
States, municipalities and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 422 598
Gross Unrealized Losses, Less than 12 Months 7 18
Estimated Fair Value, 12 Months or Longer 3,155 3,104
Gross Unrealized Losses, 12 Months or Longer 610 685
Estimated Fair Value, Total 3,577 3,702
Gross Unrealized Losses, Total 617 703
Residential mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 130 233
Gross Unrealized Losses, Less than 12 Months 2 4
Estimated Fair Value, 12 Months or Longer 2,162 2,212
Gross Unrealized Losses, 12 Months or Longer 360 421
Estimated Fair Value, Total 2,292 2,445
Gross Unrealized Losses, Total 362 425
Commercial mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 112 200
Gross Unrealized Losses, Less than 12 Months 0 5
Estimated Fair Value, 12 Months or Longer 1,134 1,184
Gross Unrealized Losses, 12 Months or Longer 141 225
Estimated Fair Value, Total 1,246 1,384
Gross Unrealized Losses, Total 141 230
Other asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 151 392
Gross Unrealized Losses, Less than 12 Months 4 8
Estimated Fair Value, 12 Months or Longer 1,638 1,869
Gross Unrealized Losses, 12 Months or Longer 182 248
Estimated Fair Value, Total 1,789 2,261
Gross Unrealized Losses, Total 186 256
Asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 393 825
Gross Unrealized Losses, Less than 12 Months 6 17
Estimated Fair Value, 12 Months or Longer 4,934 5,265
Gross Unrealized Losses, 12 Months or Longer 683 894
Estimated Fair Value, Total 5,327 6,090
Gross Unrealized Losses, Total 689 911
U.S. Treasury and obligations of government-sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 45 65
Gross Unrealized Losses, Less than 12 Months 2 1
Estimated Fair Value, 12 Months or Longer 45 23
Gross Unrealized Losses, 12 Months or Longer 2 1
Estimated Fair Value, Total 90 88
Gross Unrealized Losses, Total 4 2
Foreign government    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 99 52
Gross Unrealized Losses, Less than 12 Months 1 1
Estimated Fair Value, 12 Months or Longer 403 450
Gross Unrealized Losses, 12 Months or Longer 25 33
Estimated Fair Value, Total 502 502
Gross Unrealized Losses, Total $ 26 $ 34