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Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | $ 5,695 | $ 1,666
Gross Unrealized Losses, Less than 12 Months | 92 | 74
Estimated Fair Value, 12 Months or Longer | 370 | 64
Gross Unrealized Losses, 12 Months or Longer | 20 | 3
Estimated Fair Value, Total | 6,065 | 1,730
Gross Unrealized Losses, Total | 112 | 77
Corporate and other bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 2,389 | 609
Gross Unrealized Losses, Less than 12 Months | 48 | 21
Estimated Fair Value, 12 Months or Longer | 136 | 12
Gross Unrealized Losses, 12 Months or Longer | 8 | 1
Estimated Fair Value, Total | 2,525 | 621
Gross Unrealized Losses, Total | 56 | 22
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 730 | 33
Gross Unrealized Losses, Less than 12 Months | 14 | 0
Estimated Fair Value, 12 Months or Longer | 0 | 0
Gross Unrealized Losses, 12 Months or Longer | 0 | 0
Estimated Fair Value, Total | 730 | 33
Gross Unrealized Losses, Total | 14 |
Residential mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 1,043 | 71
Gross Unrealized Losses, Less than 12 Months | 8 | 1
Estimated Fair Value, 12 Months or Longer | 0 | 11
Gross Unrealized Losses, 12 Months or Longer | 0 | 0
Estimated Fair Value, Total | 1,043 | 82
Gross Unrealized Losses, Total | 8 | 1
Commercial mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 527 | 533
Gross Unrealized Losses, Less than 12 Months | 7 | 40
Estimated Fair Value, 12 Months or Longer | 167 | 28
Gross Unrealized Losses, 12 Months or Longer | 12 | 2
Estimated Fair Value, Total | 694 | 561
Gross Unrealized Losses, Total | 19 | 42
Other asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 840 | 344
Gross Unrealized Losses, Less than 12 Months | 10 | 9
Estimated Fair Value, 12 Months or Longer | 62 | 13
Gross Unrealized Losses, 12 Months or Longer | 0 | 0
Estimated Fair Value, Total | 902 | 357
Gross Unrealized Losses, Total | 10 | 9
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 2,410 | 948
Gross Unrealized Losses, Less than 12 Months | 25 | 50
Estimated Fair Value, 12 Months or Longer | 229 | 52
Gross Unrealized Losses, 12 Months or Longer | 12 | 2
Estimated Fair Value, Total | 2,639 | 1,000
Gross Unrealized Losses, Total | 37 | 52
U.S. Treasury and obligations of government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 69 | 63
Gross Unrealized Losses, Less than 12 Months | 3 | 3
Estimated Fair Value, 12 Months or Longer | 5 | 0
Gross Unrealized Losses, 12 Months or Longer | 0 | 0
Estimated Fair Value, Total | 74 | 63
Gross Unrealized Losses, Total | 3 | 3
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 97 | 13
Gross Unrealized Losses, Less than 12 Months | 2 | 0
Estimated Fair Value, 12 Months or Longer | 0 | 0
Gross Unrealized Losses, 12 Months or Longer | 0 | 0
Estimated Fair Value, Total | 97 | 13
Gross Unrealized Losses, Total | $ 2 | $ 0

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