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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

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