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Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | $ 15,913 | $ 5,695
Gross Unrealized Losses, Less than 12 Months | 1,086 | 92
Estimated Fair Value, 12 Months or Longer | 611 | 370
Gross Unrealized Losses, 12 Months or Longer | 71 | 20
Estimated Fair Value, Total | 16,524 | 6,065
Gross Unrealized Losses, Total | 1,157 | 112
Corporate and other bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 7,390 | 2,389
Gross Unrealized Losses, Less than 12 Months | 441 | 48
Estimated Fair Value, 12 Months or Longer | 327 | 136
Gross Unrealized Losses, 12 Months or Longer | 45 | 8
Estimated Fair Value, Total | 7,717 | 2,525
Gross Unrealized Losses, Total | 486 | 56
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 2,796 | 730
Gross Unrealized Losses, Less than 12 Months | 314 | 14
Estimated Fair Value, 12 Months or Longer | 35 | 0
Gross Unrealized Losses, 12 Months or Longer | 5 | 0
Estimated Fair Value, Total | 2,831 | 730
Gross Unrealized Losses, Total | 319 | 14
Residential mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 2,315 | 1,043
Gross Unrealized Losses, Less than 12 Months | 160 | 8
Estimated Fair Value, 12 Months or Longer | 0 | 0
Gross Unrealized Losses, 12 Months or Longer | 0 | 0
Estimated Fair Value, Total | 2,315 | 1,043
Gross Unrealized Losses, Total | 160 | 8
Commercial mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 1,274 | 527
Gross Unrealized Losses, Less than 12 Months | 65 | 7
Estimated Fair Value, 12 Months or Longer | 151 | 167
Gross Unrealized Losses, 12 Months or Longer | 16 | 12
Estimated Fair Value, Total | 1,425 | 694
Gross Unrealized Losses, Total | 81 | 19
Other asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 1,717 | 840
Gross Unrealized Losses, Less than 12 Months | 90 | 10
Estimated Fair Value, 12 Months or Longer | 67 | 62
Gross Unrealized Losses, 12 Months or Longer | 3 | 0
Estimated Fair Value, Total | 1,784 | 902
Gross Unrealized Losses, Total | 93 | 10
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 5,306 | 2,410
Gross Unrealized Losses, Less than 12 Months | 315 | 25
Estimated Fair Value, 12 Months or Longer | 218 | 229
Gross Unrealized Losses, 12 Months or Longer | 19 | 12
Estimated Fair Value, Total | 5,524 | 2,639
Gross Unrealized Losses, Total | 334 | 37
U.S. Treasury and obligations of government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 94 | 69
Gross Unrealized Losses, Less than 12 Months | 5 | 3
Estimated Fair Value, 12 Months or Longer | 5 | 5
Gross Unrealized Losses, 12 Months or Longer | 0 | 0
Estimated Fair Value, Total | 99 | 74
Gross Unrealized Losses, Total | 5 | 3
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 327 | 97
Gross Unrealized Losses, Less than 12 Months | 11 | 2
Estimated Fair Value, 12 Months or Longer | 26 | 0
Gross Unrealized Losses, 12 Months or Longer | 2 | 0
Estimated Fair Value, Total | 353 | 97
Gross Unrealized Losses, Total | $ 13 | $ 2

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