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Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | $ 4,653 | $ 3,483
Gross Unrealized Losses, Less than 12 Months | 87 | 74
Estimated Fair Value, 12 Months or Longer | 22,359 | 22,248
Gross Unrealized Losses, 12 Months or Longer | 3,009 | 2,921
Estimated Fair Value, Total | 27,012 | 25,731
Gross Unrealized Losses, Total | 3,096 | 2,995
Corporate and other bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 2,578 | 1,943
Gross Unrealized Losses, Less than 12 Months | 48 | 37
Estimated Fair Value, 12 Months or Longer | 13,459 | 13,406
Gross Unrealized Losses, 12 Months or Longer | 1,326 | 1,308
Estimated Fair Value, Total | 16,037 | 15,349
Gross Unrealized Losses, Total | 1,374 | 1,345
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 686 | 598
Gross Unrealized Losses, Less than 12 Months | 17 | 18
Estimated Fair Value, 12 Months or Longer | 3,266 | 3,104
Gross Unrealized Losses, 12 Months or Longer | 739 | 685
Estimated Fair Value, Total | 3,952 | 3,702
Gross Unrealized Losses, Total | 756 | 703
Residential mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 434 | 233
Gross Unrealized Losses, Less than 12 Months | 8 | 4
Estimated Fair Value, 12 Months or Longer | 2,159 | 2,212
Gross Unrealized Losses, 12 Months or Longer | 475 | 421
Estimated Fair Value, Total | 2,593 | 2,445
Gross Unrealized Losses, Total | 483 | 425
Commercial mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 131 | 200
Gross Unrealized Losses, Less than 12 Months | 2 | 5
Estimated Fair Value, 12 Months or Longer | 1,162 | 1,184
Gross Unrealized Losses, 12 Months or Longer | 191 | 225
Estimated Fair Value, Total | 1,293 | 1,384
Gross Unrealized Losses, Total | 193 | 230
Other asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 588 | 392
Gross Unrealized Losses, Less than 12 Months | 9 | 8
Estimated Fair Value, 12 Months or Longer | 1,833 | 1,869
Gross Unrealized Losses, 12 Months or Longer | 242 | 248
Estimated Fair Value, Total | 2,421 | 2,261
Gross Unrealized Losses, Total | 251 | 256
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 1,153 | 825
Gross Unrealized Losses, Less than 12 Months | 19 | 17
Estimated Fair Value, 12 Months or Longer | 5,154 | 5,265
Gross Unrealized Losses, 12 Months or Longer | 908 | 894
Estimated Fair Value, Total | 6,307 | 6,090
Gross Unrealized Losses, Total | 927 | 911
U.S. Treasury and obligations of government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 100 | 65
Gross Unrealized Losses, Less than 12 Months | 1 | 1
Estimated Fair Value, 12 Months or Longer | 28 | 23
Gross Unrealized Losses, 12 Months or Longer | 1 | 1
Estimated Fair Value, Total | 128 | 88
Gross Unrealized Losses, Total | 2 | 2
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 136 | 52
Gross Unrealized Losses, Less than 12 Months | 2 | 1
Estimated Fair Value, 12 Months or Longer | 452 | 450
Gross Unrealized Losses, 12 Months or Longer | 35 | 33
Estimated Fair Value, Total | 588 | 502
Gross Unrealized Losses, Total | $ 37 | $ 34

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