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Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | $ 8,048 | $ 9,019
Gross Unrealized Losses, Less than 12 Months | 221 | 267
Estimated Fair Value, 12 Months or Longer | 17,798 | 18,319
Gross Unrealized Losses, 12 Months or Longer | 2,546 | 2,773
Estimated Fair Value, Total | 25,846 | 27,338
Gross Unrealized Losses, Total | 2,767 | 3,040
Corporate and other bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 5,816 | 5,846
Gross Unrealized Losses, Less than 12 Months | 141 | 165
Estimated Fair Value, 12 Months or Longer | 9,986 | 10,388
Gross Unrealized Losses, 12 Months or Longer | 1,008 | 1,140
Estimated Fair Value, Total | 15,802 | 16,234
Gross Unrealized Losses, Total | 1,149 | 1,305
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 944 | 1,247
Gross Unrealized Losses, Less than 12 Months | 51 | 52
Estimated Fair Value, 12 Months or Longer | 2,986 | 2,967
Gross Unrealized Losses, 12 Months or Longer | 778 | 783
Estimated Fair Value, Total | 3,930 | 4,214
Gross Unrealized Losses, Total | 829 | 835
Residential mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 413 | 849
Gross Unrealized Losses, Less than 12 Months | 9 | 22
Estimated Fair Value, 12 Months or Longer | 2,016 | 2,010
Gross Unrealized Losses, 12 Months or Longer | 417 | 466
Estimated Fair Value, Total | 2,429 | 2,859
Gross Unrealized Losses, Total | 426 | 488
Commercial mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 98 | 230
Gross Unrealized Losses, Less than 12 Months | 1 | 3
Estimated Fair Value, 12 Months or Longer | 969 | 988
Gross Unrealized Losses, 12 Months or Longer | 118 | 139
Estimated Fair Value, Total | 1,067 | 1,218
Gross Unrealized Losses, Total | 119 | 142
Other asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 629 | 680
Gross Unrealized Losses, Less than 12 Months | 16 | 21
Estimated Fair Value, 12 Months or Longer | 1,499 | 1,557
Gross Unrealized Losses, 12 Months or Longer | 200 | 218
Estimated Fair Value, Total | 2,128 | 2,237
Gross Unrealized Losses, Total | 216 | 239
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 1,140 | 1,759
Gross Unrealized Losses, Less than 12 Months | 26 | 46
Estimated Fair Value, 12 Months or Longer | 4,484 | 4,555
Gross Unrealized Losses, 12 Months or Longer | 735 | 823
Estimated Fair Value, Total | 5,624 | 6,314
Gross Unrealized Losses, Total | 761 | 869
U.S. Treasury and obligations of government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 43 | 49
Gross Unrealized Losses, Less than 12 Months | 1 | 1
Estimated Fair Value, 12 Months or Longer | 42 | 41
Gross Unrealized Losses, 12 Months or Longer | 1 | 0
Estimated Fair Value, Total | 85 | 90
Gross Unrealized Losses, Total | 2 | 1
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 105 | 118
Gross Unrealized Losses, Less than 12 Months | 2 | 3
Estimated Fair Value, 12 Months or Longer | 300 | 368
Gross Unrealized Losses, 12 Months or Longer | 24 | 27
Estimated Fair Value, Total | 405 | 486
Gross Unrealized Losses, Total | $ 26 | $ 30

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