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Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | $ 11,350 | $ 25,234
Gross Unrealized Losses, Less than 12 Months | 506 | 2,946
Estimated Fair Value, 12 Months or Longer | 18,262 | 4,277
Gross Unrealized Losses, 12 Months or Longer | 3,280 | 1,110
Estimated Fair Value, Total | 29,612 | 29,511
Gross Unrealized Losses, Total | 3,786 | 4,056
Corporate and other bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 7,681 | 15,946
Gross Unrealized Losses, Less than 12 Months | 350 | 1,585
Estimated Fair Value, 12 Months or Longer | 10,087 | 1,634
Gross Unrealized Losses, 12 Months or Longer | 1,559 | 424
Estimated Fair Value, Total | 17,768 | 17,580
Gross Unrealized Losses, Total | 1,909 | 2,009
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 1,486 | 4,079
Gross Unrealized Losses, Less than 12 Months | 64 | 769
Estimated Fair Value, 12 Months or Longer | 2,783 | 456
Gross Unrealized Losses, 12 Months or Longer | 729 | 170
Estimated Fair Value, Total | 4,269 | 4,535
Gross Unrealized Losses, Total | 793 | 939
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 1,886 | 4,660
Gross Unrealized Losses, Less than 12 Months | 82 | 565
Estimated Fair Value, 12 Months or Longer | 4,963 | 2,093
Gross Unrealized Losses, 12 Months or Longer | 949 | 498
Estimated Fair Value, Total | 6,849 | 6,753
Gross Unrealized Losses, Total | 1,031 | 1,063
Residential mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 822 | 1,406
Gross Unrealized Losses, Less than 12 Months | 35 | 144
Estimated Fair Value, 12 Months or Longer | 1,810 | 1,143
Gross Unrealized Losses, 12 Months or Longer | 409 | 303
Estimated Fair Value, Total | 2,632 | 2,549
Gross Unrealized Losses, Total | 444 | 447
Commercial mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 325 | 1,167
Gross Unrealized Losses, Less than 12 Months | 15 | 159
Estimated Fair Value, 12 Months or Longer | 1,171 | 408
Gross Unrealized Losses, 12 Months or Longer | 242 | 96
Estimated Fair Value, Total | 1,496 | 1,575
Gross Unrealized Losses, Total | 257 | 255
Other asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 739 | 2,087
Gross Unrealized Losses, Less than 12 Months | 32 | 262
Estimated Fair Value, 12 Months or Longer | 1,982 | 542
Gross Unrealized Losses, 12 Months or Longer | 298 | 99
Estimated Fair Value, Total | 2,721 | 2,629
Gross Unrealized Losses, Total | 330 | 361
U.S. Treasury and obligations of government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 84 | 76
Gross Unrealized Losses, Less than 12 Months | 2 | 1
Estimated Fair Value, 12 Months or Longer | 34 | 16
Gross Unrealized Losses, 12 Months or Longer | 1 | 1
Estimated Fair Value, Total | 118 | 92
Gross Unrealized Losses, Total | 3 | 2
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 213 | 473
Gross Unrealized Losses, Less than 12 Months | 8 | 26
Estimated Fair Value, 12 Months or Longer | 395 | 78
Gross Unrealized Losses, 12 Months or Longer | 42 | 17
Estimated Fair Value, Total | 608 | 551
Gross Unrealized Losses, Total | $ 50 | $ 43

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