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Investments - Available-for-sale Securities in Gross Unrealized Loss Position (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Estimated Fair Value |  |
Total, Estimated Fair Value | $ 22,400 | $ 25,731
Gross Unrealized Losses |  |
Total, Gross Unrealized Losses | 2,236 | 2,995
Fixed maturity securities |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 2,623 | 3,483
12 Months or Longer, Estimated Fair Value | 19,777 | 22,248
Total, Estimated Fair Value | 22,400 | 25,731
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses | 47 | 74
12 Months or Longer, Gross Unrealized Losses | 2,189 | 2,921
Total, Gross Unrealized Losses | 2,236 | 2,995
Corporate bonds and other |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 1,664 | 1,943
12 Months or Longer, Estimated Fair Value | 11,240 | 13,406
Total, Estimated Fair Value | 12,904 | 15,349
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses | 31 | 37
12 Months or Longer, Gross Unrealized Losses | 869 | 1,308
Total, Gross Unrealized Losses | 900 | 1,345
States, municipalities and political subdivisions |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 422 | 598
12 Months or Longer, Estimated Fair Value | 3,155 | 3,104
Total, Estimated Fair Value | 3,577 | 3,702
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses | 7 | 18
12 Months or Longer, Gross Unrealized Losses | 610 | 685
Total, Gross Unrealized Losses | 617 | 703
Residential mortgage-backed |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 130 | 233
12 Months or Longer, Estimated Fair Value | 2,162 | 2,212
Total, Estimated Fair Value | 2,292 | 2,445
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses | 2 | 4
12 Months or Longer, Gross Unrealized Losses | 360 | 421
Total, Gross Unrealized Losses | 362 | 425
Commercial mortgage-backed |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 112 | 200
12 Months or Longer, Estimated Fair Value | 1,134 | 1,184
Total, Estimated Fair Value | 1,246 | 1,384
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses |  | 5
12 Months or Longer, Gross Unrealized Losses | 141 | 225
Total, Gross Unrealized Losses | 141 | 230
Other asset-backed |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 151 | 392
12 Months or Longer, Estimated Fair Value | 1,638 | 1,869
Total, Estimated Fair Value | 1,789 | 2,261
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses | 4 | 8
12 Months or Longer, Gross Unrealized Losses | 182 | 248
Total, Gross Unrealized Losses | 186 | 256
Total asset-backed |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 393 | 825
12 Months or Longer, Estimated Fair Value | 4,934 | 5,265
Total, Estimated Fair Value | 5,327 | 6,090
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses | 6 | 17
12 Months or Longer, Gross Unrealized Losses | 683 | 894
Total, Gross Unrealized Losses | 689 | 911
U.S. Treasury and obligations of government-sponsored enterprises |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 45 | 65
12 Months or Longer, Estimated Fair Value | 45 | 23
Total, Estimated Fair Value | 90 | 88
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses | 2 | 1
12 Months or Longer, Gross Unrealized Losses | 2 | 1
Total, Gross Unrealized Losses | 4 | 2
Foreign government |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 99 | 52
12 Months or Longer, Estimated Fair Value | 403 | 450
Total, Estimated Fair Value | 502 | 502
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses | 1 | 1
12 Months or Longer, Gross Unrealized Losses | 25 | 33
Total, Gross Unrealized Losses | $ 26 | $ 34

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