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Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | $ 9,836 | $ 25,234
Gross Unrealized Losses, Less than 12 Months | 605 | 2,946
Estimated Fair Value, 12 Months or Longer | 21,281 | 4,277
Gross Unrealized Losses, 12 Months or Longer | 4,283 | 1,110
Estimated Fair Value, Total | 31,117 | 29,511
Gross Unrealized Losses, Total | 4,888 | 4,056
Corporate and other bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 6,374 | 15,946
Gross Unrealized Losses, Less than 12 Months | 378 | 1,585
Estimated Fair Value, 12 Months or Longer | 12,794 | 1,634
Gross Unrealized Losses, 12 Months or Longer | 2,059 | 424
Estimated Fair Value, Total | 19,168 | 17,580
Gross Unrealized Losses, Total | 2,437 | 2,009
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 1,593 | 4,079
Gross Unrealized Losses, Less than 12 Months | 138 | 769
Estimated Fair Value, 12 Months or Longer | 2,902 | 456
Gross Unrealized Losses, 12 Months or Longer | 1,014 | 170
Estimated Fair Value, Total | 4,495 | 4,535
Gross Unrealized Losses, Total | 1,152 | 939
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 1,562 | 4,660
Gross Unrealized Losses, Less than 12 Months | 79 | 565
Estimated Fair Value, 12 Months or Longer | 5,128 | 2,093
Gross Unrealized Losses, 12 Months or Longer | 1,162 | 498
Estimated Fair Value, Total | 6,690 | 6,753
Gross Unrealized Losses, Total | 1,241 | 1,063
Residential mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 680 | 1,406
Gross Unrealized Losses, Less than 12 Months | 30 | 144
Estimated Fair Value, 12 Months or Longer | 2,094 | 1,143
Gross Unrealized Losses, 12 Months or Longer | 569 | 303
Estimated Fair Value, Total | 2,774 | 2,549
Gross Unrealized Losses, Total | 599 | 447
Commercial mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 273 | 1,167
Gross Unrealized Losses, Less than 12 Months | 9 | 159
Estimated Fair Value, 12 Months or Longer | 1,161 | 408
Gross Unrealized Losses, 12 Months or Longer | 267 | 96
Estimated Fair Value, Total | 1,434 | 1,575
Gross Unrealized Losses, Total | 276 | 255
Other asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 609 | 2,087
Gross Unrealized Losses, Less than 12 Months | 40 | 262
Estimated Fair Value, 12 Months or Longer | 1,873 | 542
Gross Unrealized Losses, 12 Months or Longer | 326 | 99
Estimated Fair Value, Total | 2,482 | 2,629
Gross Unrealized Losses, Total | 366 | 361
U.S. Treasury and obligations of government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 106 | 76
Gross Unrealized Losses, Less than 12 Months | 1 | 1
Estimated Fair Value, 12 Months or Longer | 21 | 16
Gross Unrealized Losses, 12 Months or Longer | 1 | 1
Estimated Fair Value, Total | 127 | 92
Gross Unrealized Losses, Total | 2 | 2
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 201 | 473
Gross Unrealized Losses, Less than 12 Months | 9 | 26
Estimated Fair Value, 12 Months or Longer | 436 | 78
Gross Unrealized Losses, 12 Months or Longer | 47 | 17
Estimated Fair Value, Total | 637 | 551
Gross Unrealized Losses, Total | $ 56 | $ 43

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