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Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | $ 28,394 | $ 5,695
Gross Unrealized Losses, Less than 12 Months | 4,152 | 92
Estimated Fair Value, 12 Months or Longer | 1,550 | 370
Gross Unrealized Losses, 12 Months or Longer | 431 | 20
Estimated Fair Value, Total | 29,944 | 6,065
Gross Unrealized Losses, Total | 4,583 | 112
Corporate and other bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 16,707 | 2,389
Gross Unrealized Losses, Less than 12 Months | 2,117 | 48
Estimated Fair Value, 12 Months or Longer | 914 | 136
Gross Unrealized Losses, 12 Months or Longer | 281 | 8
Estimated Fair Value, Total | 17,621 | 2,525
Gross Unrealized Losses, Total | 2,398 | 56
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 4,793 | 730
Gross Unrealized Losses, Less than 12 Months | 1,029 | 14
Estimated Fair Value, 12 Months or Longer | 128 | 0
Gross Unrealized Losses, 12 Months or Longer | 51 | 0
Estimated Fair Value, Total | 4,921 | 730
Gross Unrealized Losses, Total | 1,080 | 14
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 6,387 | 2,410
Gross Unrealized Losses, Less than 12 Months | 963 | 25
Estimated Fair Value, 12 Months or Longer | 483 | 229
Gross Unrealized Losses, 12 Months or Longer | 93 | 12
Estimated Fair Value, Total | 6,870 | 2,639
Gross Unrealized Losses, Total | 1,056 | 37
Residential mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 2,582 | 1,043
Gross Unrealized Losses, Less than 12 Months | 462 | 8
Estimated Fair Value, 12 Months or Longer | 17 | 0
Gross Unrealized Losses, 12 Months or Longer | 8 | 0
Estimated Fair Value, Total | 2,599 | 1,043
Gross Unrealized Losses, Total | 470 | 8
Commercial mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 1,372 | 527
Gross Unrealized Losses, Less than 12 Months | 194 | 7
Estimated Fair Value, 12 Months or Longer | 233 | 167
Gross Unrealized Losses, 12 Months or Longer | 43 | 12
Estimated Fair Value, Total | 1,605 | 694
Gross Unrealized Losses, Total | 237 | 19
Other asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 2,433 | 840
Gross Unrealized Losses, Less than 12 Months | 307 | 10
Estimated Fair Value, 12 Months or Longer | 233 | 62
Gross Unrealized Losses, 12 Months or Longer | 42 | 0
Estimated Fair Value, Total | 2,666 | 902
Gross Unrealized Losses, Total | 349 | 10
U.S. Treasury and obligations of government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 61 | 69
Gross Unrealized Losses, Less than 12 Months | 1 | 3
Estimated Fair Value, 12 Months or Longer | 0 | 5
Gross Unrealized Losses, 12 Months or Longer | 0 | 0
Estimated Fair Value, Total | 61 | 74
Gross Unrealized Losses, Total | 1 | 3
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 446 | 97
Gross Unrealized Losses, Less than 12 Months | 42 | 2
Estimated Fair Value, 12 Months or Longer | 25 | 0
Gross Unrealized Losses, 12 Months or Longer | 6 | 0
Estimated Fair Value, Total | 471 | 97
Gross Unrealized Losses, Total | $ 48 | $ 2

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