| Fiscal period | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
| Period End Date | 12/31/2025 | 12/31/2024 | 12/31/2023 | 12/31/2022 | 12/31/2021 | 12/31/2020 | 12/31/2019 | 12/31/2018 | 12/31/2017 | 12/31/2016 |
| Direct:Property-liability insurance premiums earned | -- | -- | 52,301.00 | 47,552.00 | 43,944.00 | 38,115.00 | 37,104.00 | 34,977.00 | 33,221.00 | 32,249.00 |
| Assumed:Property-liability insurance premiums earned | -- | -- | 358.00 | 221.00 | 178.00 | 99.00 | 94.00 | 87.00 | 50.00 | 45.00 |
| Direct:Life and annuity premiums and contract charges | -- | -- | 1,865.00 | 1,840.00 | 1,878.00 | 2,001.00 | 2,074.00 | 2,001.00 | 1,894.00 | 1,766.00 |
| Assumed:Life and annuity premiums and contract charges | -- | -- | 28.00 | 31.00 | 21.00 | 685.00 | 712.00 | 754.00 | 787.00 | 818.00 |
| Ceded:Property-liability insurance premiums earned | -- | -- | 1,989.00 | 1,869.00 | 1,904.00 | 1,141.00 | 1,122.00 | 1,016.00 | 971.00 | 987.00 |
| Ceded:Life and annuity premiums and contract charges | -- | -- | 47.00 | 38.00 | 78.00 | 242.00 | 285.00 | 290.00 | 303.00 | 309.00 |
| Property-liability insurance premiums | 60,503.00 | 56,388.00 | 50,670.00 | 45,904.00 | 42,218.00 | 37,073.00 | 36,076.00 | 34,048.00 | 32,300.00 | 31,307.00 |
| Life and annuity premiums and contract charges | 946.00 | 1,921.00 | 1,846.00 | 1,833.00 | 1,821.00 | 2,444.00 | 2,501.00 | 2,465.00 | 2,378.00 | 2,275.00 |
| Equity securities | 257.00 | 82.00 | 282.00 | -- | 520.00 | 346.00 | 1,210.00 | (594.00) | 255.00 | 23.00 |
| Derivatives | (76.00) | (14.00) | (84.00) | 874.00 | 49.00 | 53.00 | (15.00) | 46.00 | (46.00) | 3.00 |
| Realized capital gains and losses | (168.00) | (225.00) | (300.00) | (1,072.00) | 1,084.00 | 1,356.00 | 1,885.00 | (877.00) | 445.00 | (90.00) |
| Investment write-downs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Dispositions | (67.00) | (123.00) | -- | -- | -- | -- | -- | -- | -- | -- |
| Valuation of derivative instruments | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Settlement of derivative instruments | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Mortgage loans | (2.00) | (1.00) | (4.00) | -- | -- | (47.00) | -- | 2.00 | 1.00 | -- |
| Other investments | (47.00) | 40.00 | 42.00 | -- | 122.00 | (3.00) | 29.00 | 7.00 | 9.00 | (4.00) |
| Fixed income securities | (215.00) | (200.00) | (540.00) | -- | 425.00 | 983.00 | 461.00 | (237.00) | 94.00 | (91.00) |
| Short-term investments | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Limited partnership interests | (18.00) | (9.00) | 499.00 | -- | -- | 24.00 | 200.00 | (101.00) | 132.00 | (21.00) |
| Net investment income | 3,449.00 | 3,092.00 | 2,478.00 | 2,403.00 | 3,293.00 | 2,853.00 | 3,159.00 | 3,240.00 | 3,401.00 | 3,042.00 |
| Equity securities | 99.00 | 77.00 | 75.00 | (900.00) | -- | 98.00 | 206.00 | 170.00 | 174.00 | 137.00 |
| Other | 119.00 | 106.00 | 169.00 | 21.00 | -- | 251.00 | 262.00 | 272.00 | 236.00 | 222.00 |
| Short-term investments | 345.00 | 290.00 | 253.00 | -- | -- | 23.00 | 102.00 | 73.00 | 30.00 | 16.00 |
| Fixed income securities | 2,509.00 | 2,298.00 | 1,761.00 | (875.00) | -- | 2,136.00 | 2,175.00 | 2,077.00 | 2,078.00 | 2,060.00 |
| Mortgage loans | 41.00 | 36.00 | 35.00 | (1.00) | 20.00 | 220.00 | 220.00 | 217.00 | 206.00 | 217.00 |
| Investment expense | (298.00) | (315.00) | (314.00) | -- | -- | (213.00) | (277.00) | (274.00) | (212.00) | (171.00) |
| Limited partnership interests | 634.00 | 600.00 | 499.00 | (191.00) | (52.00) | 338.00 | 471.00 | 705.00 | 889.00 | 561.00 |
| Other revenue | 2,955.00 | 2,930.00 | 2,400.00 | 2,344.00 | 2,172.00 | 1,065.00 | 1,054.00 | 939.00 | -- | -- |
| Total Revenues | 67,685.00 | 64,106.00 | 57,094.00 | 51,412.00 | 50,588.00 | 44,791.00 | 44,675.00 | 39,815.00 | 38,524.00 | 36,534.00 |
| Property-liability insurance claims and claims expense | 37,454.00 | 39,735.00 | 41,070.00 | 37,264.00 | 29,318.00 | 22,001.00 | 23,976.00 | 22,839.00 | 21,929.00 | 22,221.00 |
| Life and annuity contract benefits | 656.00 | 1,241.00 | 1,071.00 | 1,061.00 | 1,015.00 | 2,243.00 | 2,039.00 | 1,973.00 | 1,923.00 | 1,857.00 |
| Interest credited to contractholder funds | -- | -- | -- | -- | 34.00 | 638.00 | 640.00 | 654.00 | 690.00 | 726.00 |
| Amortization of deferred policy acquisition costs | 8,389.00 | 8,039.00 | 7,278.00 | 6,644.00 | 6,252.00 | 5,630.00 | 5,533.00 | 5,222.00 | 4,784.00 | 4,550.00 |
| Amortization of goodwill | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Goodwill impairment | -- | -- | -- | -- | -- | -- | 106.00 | -- | 125.00 | -- |
| Amortization of purchased intangible assets | 231.00 | 280.00 | 329.00 | 353.00 | 376.00 | 118.00 | 126.00 | 105.00 | -- | -- |
| Operating costs and expenses | (8,977.00) | (8,626.00) | (7,137.00) | (7,446.00) | (7,260.00) | (5,732.00) | (5,690.00) | (5,869.00) | (4,658.00) | (4,106.00) |
| Pension and other postretirement remeasurement gains and losses | 35.00 | 37.00 | (9.00) | (116.00) | 644.00 | 51.00 | (114.00) | -- | -- | -- |
| Shelter-in-Place Payback expense | -- | -- | -- | -- | (29.00) | (948.00) | -- | -- | -- | -- |
| Interest expense | 399.00 | 400.00 | 379.00 | 335.00 | 330.00 | 318.00 | 327.00 | 332.00 | 335.00 | 295.00 |
| Restructuring and related charges | 61.00 | 61.00 | 169.00 | 51.00 | 170.00 | 259.00 | 41.00 | 83.00 | 109.00 | 30.00 |
| Loss on disposition of operations | -- | -- | -- | -- | -- | -- | 6.00 | 6.00 | 20.00 | 5.00 |
| Loss on extinguishment of debt | -- | -- | -- | -- | -- | -- | -- | -- | -- | 0.00 |
| Gain on disposition of operations | 1,603.00 | -- | -- | -- | -- | 4.00 | -- | -- | -- | -- |
| Income from operations before income tax expenses | 13,156.00 | 5,761.00 | (348.00) | (1,858.00) | 6,448.00 | 6,959.00 | 6,089.00 | 2,744.00 | 3,991.00 | 2,754.00 |
| Income tax expense | 2,890.00 | 1,162.00 | (135.00) | (494.00) | 1,289.00 | 1,383.00 | 1,242.00 | 492.00 | 802.00 | 877.00 |
| Current | 2,734.00 | 1,179.00 | 114.00 | (36.00) | 841.00 | 1,499.00 | -- | 704.00 | 1,018.00 | 654.00 |
| Deferred | 156.00 | (17.00) | (249.00) | (458.00) | 448.00 | (116.00) | -- | (212.00) | (216.00) | 223.00 |
| Net income from continuing operations | -- | -- | (213.00) | (1,364.00) | 5,159.00 | -- | -- | -- | -- | -- |
| Loss from discontinued operations, net of tax | -- | -- | 0.00 | -- | (3,593.00) | -- | -- | -- | -- | -- |
| Income before cumulative effect of change in accounting principle | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Cumulative effect of change in accounting principle, after-tax | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net income | 10,266.00 | 4,599.00 | (213.00) | (1,364.00) | 1,566.00 | 5,576.00 | 4,847.00 | -- | -- | -- |
| Less: Net loss attributable to noncontrolling interest | (16.00) | (68.00) | (25.00) | (53.00) | (33.00) | -- | -- | -- | -- | -- |
| Consolidated Net income | -- | 4,667.00 | (188.00) | (1,311.00) | 1,599.00 | -- | -- | 2,252.00 | 3,189.00 | 1,877.00 |
| Preferred stock dividends | 117.00 | 117.00 | 128.00 | 105.00 | 114.00 | 115.00 | 169.00 | 148.00 | 116.00 | 116.00 |
| Dividends on preferred securities of subsidiary trusts | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net income | 10,165.00 | 4,550.00 | (316.00) | (1,416.00) | 1,485.00 | 5,461.00 | 4,678.00 | 2,104.00 | 3,073.00 | 1,761.00 |
| Continuing operations- Basic | -- | -- | (1.20) | (5.22) | 17.23 | -- | -- | -- | -- | -- |
| Discontinued operations- Basic | -- | -- | -- | -- | (12.19) | -- | -- | -- | -- | -- |
| Net income per share-Basic | 38.56 | 17.22 | (1.20) | (5.22) | 5.04 | 17.53 | 14.25 | 6.05 | 8.49 | 4.72 |
| Continuing operations- Diluted | -- | -- | (1.20) | (5.22) | 16.98 | -- | -- | -- | -- | -- |
| Discontinued operations- Diluted | -- | -- | -- | -- | (12.02) | -- | -- | -- | -- | -- |
| Net income per share-Diluted | 38.06 | 16.99 | (1.20) | (5.22) | 4.96 | 17.31 | 14.03 | 5.96 | 8.36 | 4.67 |
| Weighted average shares-Basic | 263.60 | 264.30 | 262.50 | 271.20 | 294.80 | 311.60 | 328.20 | 347.80 | 362.00 | 372.80 |
| Weighted average shares-Diluted | 267.10 | 267.80 | 262.50 | 271.20 | 299.10 | 315.50 | 333.50 | 353.20 | 367.80 | 377.30 |