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Investments (Securities in a gross unrealized loss position) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months $ 5,662 $ 3,483
Gross Unrealized Losses, Less than 12 Months 130 74
Estimated Fair Value, 12 Months or Longer 22,429 22,248
Gross Unrealized Losses, 12 Months or Longer 3,148 2,921
Estimated Fair Value, Total 28,091 25,731
Gross Unrealized Losses, Total 3,278 2,995
Corporate and other bonds    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 3,388 1,943
Gross Unrealized Losses, Less than 12 Months 84 37
Estimated Fair Value, 12 Months or Longer 13,395 13,406
Gross Unrealized Losses, 12 Months or Longer 1,412 1,308
Estimated Fair Value, Total 16,783 15,349
Gross Unrealized Losses, Total 1,496 1,345
States, municipalities and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 899 598
Gross Unrealized Losses, Less than 12 Months 23 18
Estimated Fair Value, 12 Months or Longer 3,257 3,104
Gross Unrealized Losses, 12 Months or Longer 777 685
Estimated Fair Value, Total 4,156 3,702
Gross Unrealized Losses, Total 800 703
Residential mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 556 233
Gross Unrealized Losses, Less than 12 Months 9 4
Estimated Fair Value, 12 Months or Longer 2,227 2,212
Gross Unrealized Losses, 12 Months or Longer 486 421
Estimated Fair Value, Total 2,783 2,445
Gross Unrealized Losses, Total 495 425
Commercial mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 170 200
Gross Unrealized Losses, Less than 12 Months 1 5
Estimated Fair Value, 12 Months or Longer 1,153 1,184
Gross Unrealized Losses, 12 Months or Longer 185 225
Estimated Fair Value, Total 1,323 1,384
Gross Unrealized Losses, Total 186 230
Other asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 372 392
Gross Unrealized Losses, Less than 12 Months 9 8
Estimated Fair Value, 12 Months or Longer 1,904 1,869
Gross Unrealized Losses, 12 Months or Longer 251 248
Estimated Fair Value, Total 2,276 2,261
Gross Unrealized Losses, Total 260 256
Asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 1,098 825
Gross Unrealized Losses, Less than 12 Months 19 17
Estimated Fair Value, 12 Months or Longer 5,284 5,265
Gross Unrealized Losses, 12 Months or Longer 922 894
Estimated Fair Value, Total 6,382 6,090
Gross Unrealized Losses, Total 941 911
U.S. Treasury and obligations of government-sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 117 65
Gross Unrealized Losses, Less than 12 Months 1 1
Estimated Fair Value, 12 Months or Longer 51 23
Gross Unrealized Losses, 12 Months or Longer 2 1
Estimated Fair Value, Total 168 88
Gross Unrealized Losses, Total 3 2
Foreign government    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value, Less than 12 months 160 52
Gross Unrealized Losses, Less than 12 Months 3 1
Estimated Fair Value, 12 Months or Longer 442 450
Gross Unrealized Losses, 12 Months or Longer 35 33
Estimated Fair Value, Total 602 502
Gross Unrealized Losses, Total $ 38 $ 34