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Investments - Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | $ 45,338 | $ 44,196
Gross Unrealized Gains | 1,134 | 715
Gross Unrealized Losses | 2,295 | 3,039
Allowance for Credit Losses | 61 | 45
Estimated Fair Value | 44,116 | 41,827
Corporate and other bonds |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 25,592 | 25,839
Gross Unrealized Gains | 734 | 423
Gross Unrealized Losses | 844 | 1,305
Allowance for Credit Losses | 21 | 13
Estimated Fair Value | 25,461 | 24,944
States, municipalities and political subdivisions |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 8,840 | 7,396
Gross Unrealized Gains | 301 | 243
Gross Unrealized Losses | 765 | 835
Allowance for Credit Losses |  |
Estimated Fair Value | 8,376 | 6,804
Asset-backed |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 9,464 | 9,274
Gross Unrealized Gains | 89 | 42
Gross Unrealized Losses | 660 | 868
Allowance for Credit Losses | 40 | 32
Estimated Fair Value | 8,853 | 8,416
Residential mortgage-backed |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 4,041 | 3,725
Gross Unrealized Gains | 42 | 7
Gross Unrealized Losses | 382 | 488
Allowance for Credit Losses |  |
Estimated Fair Value | 3,701 | 3,244
Commercial mortgage-backed |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 1,633 | 1,779
Gross Unrealized Gains | 19 | 11
Gross Unrealized Losses | 88 | 141
Allowance for Credit Losses | 22 | 18
Estimated Fair Value | 1,542 | 1,631
Other asset-backed |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 3,790 | 3,770
Gross Unrealized Gains | 28 | 24
Gross Unrealized Losses | 190 | 239
Allowance for Credit Losses | 18 | 14
Estimated Fair Value | 3,610 | 3,541
U.S. Treasury and obligations of government-sponsored enterprises |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 226 | 220
Gross Unrealized Gains |  | 1
Gross Unrealized Losses | 3 | 1
Allowance for Credit Losses |  |
Estimated Fair Value | 223 | 220
Foreign government |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 736 | 701
Gross Unrealized Gains | 10 | 6
Gross Unrealized Losses | 23 | 30
Allowance for Credit Losses |  |
Estimated Fair Value | 723 | 677
Fixed maturities available-for-sale |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 44,858 | 43,430
Gross Unrealized Gains | 1,134 | 715
Gross Unrealized Losses | 2,295 | 3,039
Allowance for Credit Losses | 61 | 45
Estimated Fair Value | 43,636 | 41,061
Fixed maturities trading |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |
Cost or Amortized Cost | 480 | 766
Gross Unrealized Gains |  |
Gross Unrealized Losses |  |
Allowance for Credit Losses |  |
Estimated Fair Value | $ 480 | $ 766

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