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Investments - Available-for-sale Securities in Gross Unrealized Loss Position (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Estimated Fair Value |  |
Total, Estimated Fair Value | $ 20,691 | $ 27,288
Gross Unrealized Losses |  |
Total, Gross Unrealized Losses | 2,295 | 3,039
Fixed maturity securities |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 4,305 | 8,969
12 Months or Longer, Estimated Fair Value | 16,386 | 18,319
Total, Estimated Fair Value | 20,691 | 27,288
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses | 109 | 266
12 Months or Longer, Gross Unrealized Losses | 2,186 | 2,773
Total, Gross Unrealized Losses | 2,295 | 3,039
Corporate bonds and other |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 2,802 | 5,846
12 Months or Longer, Estimated Fair Value | 8,578 | 10,388
Total, Estimated Fair Value | 11,380 | 16,234
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses | 58 | 165
12 Months or Longer, Gross Unrealized Losses | 786 | 1,140
Total, Gross Unrealized Losses | 844 | 1,305
States, municipalities and political subdivisions |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 701 | 1,247
12 Months or Longer, Estimated Fair Value | 3,162 | 2,967
Total, Estimated Fair Value | 3,863 | 4,214
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses | 33 | 52
12 Months or Longer, Gross Unrealized Losses | 732 | 783
Total, Gross Unrealized Losses | 765 | 835
Total asset-backed |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 665 | 1,709
12 Months or Longer, Estimated Fair Value | 4,322 | 4,555
Total, Estimated Fair Value | 4,987 | 6,264
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses | 14 | 45
12 Months or Longer, Gross Unrealized Losses | 646 | 823
Total, Gross Unrealized Losses | 660 | 868
Residential mortgage-backed |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 133 | 849
12 Months or Longer, Estimated Fair Value | 2,038 | 2,010
Total, Estimated Fair Value | 2,171 | 2,859
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses | 2 | 22
12 Months or Longer, Gross Unrealized Losses | 380 | 466
Total, Gross Unrealized Losses | 382 | 488
Commercial mortgage-backed |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 27 | 180
12 Months or Longer, Estimated Fair Value | 923 | 988
Total, Estimated Fair Value | 950 | 1,168
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses |  | 2
12 Months or Longer, Gross Unrealized Losses | 88 | 139
Total, Gross Unrealized Losses | 88 | 141
Other asset-backed |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 505 | 680
12 Months or Longer, Estimated Fair Value | 1,361 | 1,557
Total, Estimated Fair Value | 1,866 | 2,237
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses | 12 | 21
12 Months or Longer, Gross Unrealized Losses | 178 | 218
Total, Gross Unrealized Losses | 190 | 239
U.S. Treasury and obligations of government-sponsored enterprises |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 29 | 49
12 Months or Longer, Estimated Fair Value | 23 | 41
Total, Estimated Fair Value | 52 | 90
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses | 2 | 1
12 Months or Longer, Gross Unrealized Losses | 1 |
Total, Gross Unrealized Losses | 3 | 1
Foreign government |  |
Estimated Fair Value |  |
Less than 12 Months, Estimated Fair Value | 108 | 118
12 Months or Longer, Estimated Fair Value | 301 | 368
Total, Estimated Fair Value | 409 | 486
Gross Unrealized Losses |  |
Less than 12 Months, Gross Unrealized Losses | 2 | 3
12 Months or Longer, Gross Unrealized Losses | 21 | 27
Total, Gross Unrealized Losses | $ 23 | $ 30

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