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Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | $ 15,037 | $ 25,234
Gross Unrealized Losses, Less than 12 Months | 790 | 2,946
Estimated Fair Value, 12 Months or Longer | 13,229 | 4,277
Gross Unrealized Losses, 12 Months or Longer | 2,628 | 1,110
Estimated Fair Value, Total | 28,266 | 29,511
Gross Unrealized Losses, Total | 3,418 | 4,056
Corporate and other bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 10,753 | 15,946
Gross Unrealized Losses, Less than 12 Months | 545 | 1,585
Estimated Fair Value, 12 Months or Longer | 6,184 | 1,634
Gross Unrealized Losses, 12 Months or Longer | 1,130 | 424
Estimated Fair Value, Total | 16,937 | 17,580
Gross Unrealized Losses, Total | 1,675 | 2,009
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 1,708 | 4,079
Gross Unrealized Losses, Less than 12 Months | 87 | 769
Estimated Fair Value, 12 Months or Longer | 2,347 | 456
Gross Unrealized Losses, 12 Months or Longer | 654 | 170
Estimated Fair Value, Total | 4,055 | 4,535
Gross Unrealized Losses, Total | 741 | 939
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 2,288 | 4,660
Gross Unrealized Losses, Less than 12 Months | 150 | 565
Estimated Fair Value, 12 Months or Longer | 4,330 | 2,093
Gross Unrealized Losses, 12 Months or Longer | 811 | 498
Estimated Fair Value, Total | 6,618 | 6,753
Gross Unrealized Losses, Total | 961 | 1,063
Residential mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 741 | 1,406
Gross Unrealized Losses, Less than 12 Months | 28 | 144
Estimated Fair Value, 12 Months or Longer | 1,784 | 1,143
Gross Unrealized Losses, 12 Months or Longer | 385 | 303
Estimated Fair Value, Total | 2,525 | 2,549
Gross Unrealized Losses, Total | 413 | 447
Commercial mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 474 | 1,167
Gross Unrealized Losses, Less than 12 Months | 36 | 159
Estimated Fair Value, 12 Months or Longer | 1,072 | 408
Gross Unrealized Losses, 12 Months or Longer | 206 | 96
Estimated Fair Value, Total | 1,546 | 1,575
Gross Unrealized Losses, Total | 242 | 255
Other asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 1,073 | 2,087
Gross Unrealized Losses, Less than 12 Months | 86 | 262
Estimated Fair Value, 12 Months or Longer | 1,474 | 542
Gross Unrealized Losses, 12 Months or Longer | 220 | 99
Estimated Fair Value, Total | 2,547 | 2,629
Gross Unrealized Losses, Total | 306 | 361
U.S. Treasury and obligations of government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 57 | 76
Gross Unrealized Losses, Less than 12 Months | 1 | 1
Estimated Fair Value, 12 Months or Longer | 41 | 16
Gross Unrealized Losses, 12 Months or Longer | 1 | 1
Estimated Fair Value, Total | 98 | 92
Gross Unrealized Losses, Total | 2 | 2
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 231 | 473
Gross Unrealized Losses, Less than 12 Months | 7 | 26
Estimated Fair Value, 12 Months or Longer | 327 | 78
Gross Unrealized Losses, 12 Months or Longer | 32 | 17
Estimated Fair Value, Total | 558 | 551
Gross Unrealized Losses, Total | $ 39 | $ 43

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