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Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | $ 4,927 | $ 1,666
Gross Unrealized Losses, Less than 12 Months | 71 | 74
Estimated Fair Value, 12 Months or Longer | 341 | 64
Gross Unrealized Losses, 12 Months or Longer | 18 | 3
Estimated Fair Value, Total | 5,268 | 1,730
Gross Unrealized Losses, Total | 89 | 77
Corporate and other bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 1,853 | 609
Gross Unrealized Losses, Less than 12 Months | 37 | 21
Estimated Fair Value, 12 Months or Longer | 88 | 12
Gross Unrealized Losses, 12 Months or Longer | 5 | 1
Estimated Fair Value, Total | 1,941 | 621
Gross Unrealized Losses, Total | 42 | 22
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 885 | 33
Gross Unrealized Losses, Less than 12 Months | 15 | 0
Estimated Fair Value, 12 Months or Longer | 0 | 0
Gross Unrealized Losses, 12 Months or Longer | 0 | 0
Estimated Fair Value, Total | 885 | 33
Gross Unrealized Losses, Total | 15 |
Residential mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 1,295 | 71
Gross Unrealized Losses, Less than 12 Months | 6 | 1
Estimated Fair Value, 12 Months or Longer | 0 | 11
Gross Unrealized Losses, 12 Months or Longer | 0 | 0
Estimated Fair Value, Total | 1,295 | 82
Gross Unrealized Losses, Total | 6 | 1
Commercial mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 317 | 533
Gross Unrealized Losses, Less than 12 Months | 4 | 40
Estimated Fair Value, 12 Months or Longer | 194 | 28
Gross Unrealized Losses, 12 Months or Longer | 12 | 2
Estimated Fair Value, Total | 511 | 561
Gross Unrealized Losses, Total | 16 | 42
Other asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 439 | 344
Gross Unrealized Losses, Less than 12 Months | 3 | 9
Estimated Fair Value, 12 Months or Longer | 58 | 13
Gross Unrealized Losses, 12 Months or Longer | 1 | 0
Estimated Fair Value, Total | 497 | 357
Gross Unrealized Losses, Total | 4 | 9
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 2,051 | 948
Gross Unrealized Losses, Less than 12 Months | 13 | 50
Estimated Fair Value, 12 Months or Longer | 252 | 52
Gross Unrealized Losses, 12 Months or Longer | 13 | 2
Estimated Fair Value, Total | 2,303 | 1,000
Gross Unrealized Losses, Total | 26 | 52
U.S. Treasury and obligations of government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 65 | 63
Gross Unrealized Losses, Less than 12 Months | 4 | 3
Estimated Fair Value, 12 Months or Longer | 1 | 0
Gross Unrealized Losses, 12 Months or Longer | 0 | 0
Estimated Fair Value, Total | 66 | 63
Gross Unrealized Losses, Total | 4 | 3
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 months | 73 | 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 | 73 | 13
Gross Unrealized Losses, Total | $ 2 | $ 0

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