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Investments (Details) - Investment Information, Losses - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Investment disclosure details |  |
Continuous unrealized loss position, less than 12 months, fair value | $ 9,177 | $ 23,954
Continuous unrealized loss position, less than 12 months, gross unrealized losses | 179 | 454
Continuous unrealized loss position, 12 months or longer, fair value | 38,531 | 41,709
Continuous unrealized loss position, 12 months or longer, gross unrealized losses | 3,185 | 4,378
Continuous unrealized loss position, total, fair value | 47,708 | 65,663
Continuous unrealized loss position, total, gross unrealized losses | 3,364 | 4,832
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, 3 months or less | 2 | 437
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost greater than 3 months, 6 months or less | 2 | 0
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, greater than 6 months, 12 months or less | 165 | 43
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, greater than 12 months | 642 | 638
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, total | 811 | 1,118
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities [Member] |  |
Investment disclosure details |  |
Continuous unrealized loss position, less than 12 months, fair value | 192 | 557
Continuous unrealized loss position, less than 12 months, gross unrealized losses | 0 | 1
Continuous unrealized loss position, 12 months or longer, fair value | 2,067 | 2,830
Continuous unrealized loss position, 12 months or longer, gross unrealized losses | 86 | 168
Continuous unrealized loss position, total, fair value | 2,259 | 3,387
Continuous unrealized loss position, total, gross unrealized losses | 86 | 169
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, 3 months or less | 0 | 0
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost greater than 3 months, 6 months or less | 0 | 0
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, greater than 6 months, 12 months or less | 0 | 0
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, greater than 12 months | 0 | 0
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, total | 0 | 0
Obligations of U.S. states, municipalities and political subdivisions [Member] |  |
Investment disclosure details |  |
Continuous unrealized loss position, less than 12 months, fair value | 6,006 | 8,584
Continuous unrealized loss position, less than 12 months, gross unrealized losses | 162 | 160
Continuous unrealized loss position, 12 months or longer, fair value | 14,917 | 15,007
Continuous unrealized loss position, 12 months or longer, gross unrealized losses | 1,878 | 2,224
Continuous unrealized loss position, total, fair value | 20,923 | 23,591
Continuous unrealized loss position, total, gross unrealized losses | 2,040 | 2,384
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, 3 months or less | 0 | 366
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost greater than 3 months, 6 months or less | 2 | 0
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, greater than 6 months, 12 months or less | 161 | 43
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, greater than 12 months | 641 | 635
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, total | 804 | 1,044
Debt securities issued by foreign governments [Member] |  |
Investment disclosure details |  |
Continuous unrealized loss position, less than 12 months, fair value | 52 | 113
Continuous unrealized loss position, less than 12 months, gross unrealized losses | 0 | 1
Continuous unrealized loss position, 12 months or longer, fair value | 327 | 454
Continuous unrealized loss position, 12 months or longer, gross unrealized losses | 6 | 12
Continuous unrealized loss position, total, fair value | 379 | 567
Continuous unrealized loss position, total, gross unrealized losses | 6 | 13
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, 3 months or less | 0 | 0
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost greater than 3 months, 6 months or less | 0 | 0
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, greater than 6 months, 12 months or less | 0 | 0
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, greater than 12 months | 0 | 0
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, total | 0 | 0
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities [Member] |  |
Investment disclosure details |  |
Continuous unrealized loss position, less than 12 months, fair value | 1,031 | 7,359
Continuous unrealized loss position, less than 12 months, gross unrealized losses | 7 | 148
Continuous unrealized loss position, 12 months or longer, fair value | 1,773 | 1,419
Continuous unrealized loss position, 12 months or longer, gross unrealized losses | 144 | 188
Continuous unrealized loss position, total, fair value | 2,804 | 8,778
Continuous unrealized loss position, total, gross unrealized losses | 151 | 336
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, 3 months or less | 0 | 58
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost greater than 3 months, 6 months or less | 0 | 0
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, greater than 6 months, 12 months or less | 0 | 0
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, greater than 12 months | 0 | 0
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, total | 0 | 58
Corporate and all other bonds [Member] |  |
Investment disclosure details |  |
Continuous unrealized loss position, less than 12 months, fair value | 1,896 | 7,341
Continuous unrealized loss position, less than 12 months, gross unrealized losses | 10 | 144
Continuous unrealized loss position, 12 months or longer, fair value | 19,447 | 21,999
Continuous unrealized loss position, 12 months or longer, gross unrealized losses | 1,071 | 1,786
Continuous unrealized loss position, total, fair value | 21,343 | 29,340
Continuous unrealized loss position, total, gross unrealized losses | 1,081 | 1,930
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, 3 months or less | 2 | 13
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost greater than 3 months, 6 months or less | 0 | 0
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, greater than 6 months, 12 months or less | 4 | 0
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, greater than 12 months | 1 | 3
Unrealized investment losses on fixed maturity investments for which fair value is less than 80% of amortized cost, total | $ 7 | $ 16

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