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Reserve for Unpaid Losses and Loss Adjustment Expenses - Historical Loss Development Triangles, P&C (Details) $ in Millions | Dec. 31, 2024 USD ($) claim | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
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Workers' Compensation | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 18,389 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 9,665 |  |  |  |  |  |  |  |  |
Workers' Compensation | 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,625 | $ 1,625 | $ 1,645 | $ 1,667 | $ 1,699 | $ 1,714 | $ 1,724 | $ 1,801 | $ 1,835 | $ 1,873
IBNR Reserves | $ 329 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 114,700 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,200 | 1,179 | 1,151 | 1,117 | 1,068 | 1,004 | 909 | 778 | 576 | 261
Workers' Compensation | 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,621 | 1,634 | 1,670 | 1,708 | 1,748 | 1,767 | 1,780 | 1,772 | 1,772 |
IBNR Reserves | $ 331 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 112,747 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,173 | 1,145 | 1,110 | 1,064 | 1,003 | 908 | 779 | 579 | 255 |
Workers' Compensation | 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,597 | 1,635 | 1,665 | 1,757 | 1,822 | 1,840 | 1,869 | 1,862 |  |
IBNR Reserves | $ 392 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 112,274 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,118 | 1,087 | 1,035 | 977 | 900 | 778 | 575 | 261 |  |
Workers' Compensation | 2018 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,798 | 1,836 | 1,870 | 1,904 | 1,915 | 1,917 | 1,916 |  |  |
IBNR Reserves | $ 464 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 120,076 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,215 | 1,170 | 1,090 | 983 | 837 | 624 | 283 |  |  |
Workers' Compensation | 2019 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,864 | 1,899 | 1,934 | 1,934 | 1,935 | 1,937 |  |  |  |
IBNR Reserves | $ 528 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 121,158 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,204 | 1,129 | 1,007 | 856 | 637 | 291 |  |  |  |
Workers' Compensation | 2020 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,712 | 1,808 | 1,849 | 1,864 | 1,865 |  |  |  |  |
IBNR Reserves | $ 601 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 92,347 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 939 | 850 | 695 | 507 | 223 |  |  |  |  |
Workers' Compensation | Short-Duration Insurance Contract, Accident Year 2021 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,831 | 1,831 | 1,832 | 1,831 |  |  |  |  |  |
IBNR Reserves | $ 675 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 103,229 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 920 | 780 | 562 | 254 |  |  |  |  |  |
Workers' Compensation | Short-Duration Insurance Contract, Accident Year 2022 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 2,001 | 2,001 | 2,000 |  |  |  |  |  |  |
IBNR Reserves | $ 819 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 114,189 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 910 | 649 | 293 |  |  |  |  |  |  |
Workers' Compensation | Short-Duration Insurance Contract, Accident Year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 2,166 | 2,166 |  |  |  |  |  |  |  |
IBNR Reserves | $ 1,171 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 117,297 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 677 | 286 |  |  |  |  |  |  |  |
Workers' Compensation | Short-Duration Insurance Contract, Accident Year 2024 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 2,174 |  |  |  |  |  |  |  |  |
IBNR Reserves | $ 1,536 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 109,521 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 309 |  |  |  |  |  |  |  |  |
General liability | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 9,416 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 4,177 |  |  |  |  |  |  |  |  |
General liability | 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 656 | 641 | 647 | 637 | 647 | 633 | 594 | 554 | 560 | 556
IBNR Reserves | $ 60 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 16,903 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 569 | 564 | 547 | 524 | 477 | 409 | 278 | 156 | 55 | 10
General liability | 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 692 | 670 | 636 | 620 | 632 | 632 | 607 | 583 | 613 |
IBNR Reserves | $ 68 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 17,989 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 596 | 564 | 513 | 446 | 368 | 283 | 131 | 52 | 12 |
General liability | 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 690 | 657 | 615 | 613 | 615 | 613 | 614 | 626 |  |
IBNR Reserves | $ 82 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 17,581 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 553 | 506 | 441 | 344 | 255 | 156 | 67 | 15 |  |
General liability | 2018 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 816 | 751 | 728 | 703 | 697 | 669 | 692 |  |  |
IBNR Reserves | $ 167 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 19,019 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 595 | 512 | 409 | 288 | 177 | 83 | 21 |  |  |
General liability | 2019 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 876 | 859 | 839 | 821 | 826 | 822 |  |  |  |
IBNR Reserves | $ 190 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 18,871 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 613 | 501 | 339 | 192 | 100 | 29 |  |  |  |
General liability | 2020 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 857 | 873 | 922 | 922 | 938 |  |  |  |  |
IBNR Reserves | $ 363 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 14,574 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 432 | 308 | 202 | 110 | 45 |  |  |  |  |
General liability | Short-Duration Insurance Contract, Accident Year 2021 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,000 | 983 | 991 | 1,002 |  |  |  |  |  |
IBNR Reserves | $ 493 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 12,839 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 394 | 209 | 115 | 34 |  |  |  |  |  |
General liability | Short-Duration Insurance Contract, Accident Year 2022 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,167 | 1,110 | 1,116 |  |  |  |  |  |  |
IBNR Reserves | $ 746 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 12,673 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 281 | 134 | 26 |  |  |  |  |  |  |
General liability | Short-Duration Insurance Contract, Accident Year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,230 | 1,219 |  |  |  |  |  |  |  |
IBNR Reserves | $ 989 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 10,854 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 128 | 17 |  |  |  |  |  |  |  |
General liability | Short-Duration Insurance Contract, Accident Year 2024 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,432 |  |  |  |  |  |  |  |  |
IBNR Reserves | $ 1,366 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 7,290 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 16 |  |  |  |  |  |  |  |  |
Marine [Member] | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,427 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,114 |  |  |  |  |  |  |  |  |
Marine [Member] | 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 139 | 140 | 142 | 139 | 138 | 133 | 148 | 146 | 146 | 158
IBNR Reserves | $ 1 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 10,559 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 141 | 142 | 142 | 140 | 139 | 133 | 125 | 116 | 85 | 40
Marine [Member] | 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 157 | 158 | 148 | 146 | 149 | 147 | 137 | 142 | 139 |
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 13,811 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 141 | 146 | 143 | 140 | 131 | 122 | 105 | 80 | 35 |
Marine [Member] | 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 172 | 174 | 167 | 165 | 159 | 160 | 173 | 153 |  |
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 16,235 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 167 | 170 | 161 | 150 | 143 | 133 | 106 | 47 |  |
Marine [Member] | 2018 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 155 | 156 | 152 | 146 | 141 | 146 | 131 |  |  |
IBNR Reserves | $ (5) |  |  |  |  |  |  |  |  |
Claims Reported | claim | 10,812 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 151 | 159 | 142 | 135 | 126 | 94 | 33 |  |  |
Marine [Member] | 2019 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 127 | 127 | 129 | 134 | 135 | 139 |  |  |  |
IBNR Reserves | $ (3) |  |  |  |  |  |  |  |  |
Claims Reported | claim | 7,261 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 120 | 115 | 105 | 96 | 80 | 34 |  |  |  |
Marine [Member] | 2020 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 142 | 137 | 134 | 137 | 145 |  |  |  |  |
IBNR Reserves | $ 7 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 5,261 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 114 | 99 | 90 | 68 | 31 |  |  |  |  |
Marine [Member] | Short-Duration Insurance Contract, Accident Year 2021 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 127 | 119 | 127 | 127 |  |  |  |  |  |
IBNR Reserves | $ 15 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 5,357 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 101 | 87 | 63 | 25 |  |  |  |  |  |
Marine [Member] | Short-Duration Insurance Contract, Accident Year 2022 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 130 | 132 | 140 |  |  |  |  |  |  |
IBNR Reserves | $ 22 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 5,306 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 89 | 72 | 27 |  |  |  |  |  |  |
Marine [Member] | Short-Duration Insurance Contract, Accident Year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 129 | 134 |  |  |  |  |  |  |  |
IBNR Reserves | $ 39 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 4,674 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 58 | 22 |  |  |  |  |  |  |  |
Marine [Member] | Short-Duration Insurance Contract, Accident Year 2024 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 149 |  |  |  |  |  |  |  |  |
IBNR Reserves | $ 83 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 3,735 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 32 |  |  |  |  |  |  |  |  |
Package Business [Member] | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 8,630 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 6,279 |  |  |  |  |  |  |  |  |
Package Business [Member] | 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 570 | 564 | 564 | 567 | 581 | 588 | 583 | 585 | 588 | 582
IBNR Reserves | $ 17 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 42,479 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 549 | 542 | 530 | 513 | 505 | 486 | 445 | 383 | 332 | 212
Package Business [Member] | 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 582 | 590 | 591 | 595 | 611 | 625 | 632 | 638 | 655 |
IBNR Reserves | $ 24 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 44,381 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 549 | 545 | 540 | 521 | 500 | 465 | 410 | 353 | 225 |
Package Business [Member] | 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 638 | 640 | 637 | 644 | 657 | 692 | 702 | 695 |  |
IBNR Reserves | $ 33 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 46,958 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 593 | 578 | 561 | 534 | 496 | 447 | 372 | 235 |  |
Package Business [Member] | 2018 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 671 | 654 | 655 | 667 | 688 | 724 | 719 |  |  |
IBNR Reserves | $ 46 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 45,361 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 609 | 571 | 537 | 498 | 451 | 402 | 237 |  |  |
Package Business [Member] | 2019 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 761 | 747 | 744 | 749 | 769 | 813 |  |  |  |
IBNR Reserves | $ 72 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 43,955 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 666 | 626 | 571 | 488 | 413 | 254 |  |  |  |
Package Business [Member] | 2020 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 828 | 837 | 877 | 893 | 915 |  |  |  |  |
IBNR Reserves | $ 101 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 62,964 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 699 | 648 | 573 | 493 | 326 |  |  |  |  |
Package Business [Member] | Short-Duration Insurance Contract, Accident Year 2021 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 958 | 958 | 954 | 946 |  |  |  |  |  |
IBNR Reserves | $ 150 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 47,755 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 746 | 650 | 556 | 368 |  |  |  |  |  |
Package Business [Member] | Short-Duration Insurance Contract, Accident Year 2022 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,043 | 1,039 | 1,038 |  |  |  |  |  |  |
IBNR Reserves | $ 215 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 47,134 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 728 | 633 | 319 |  |  |  |  |  |  |
Package Business [Member] | Short-Duration Insurance Contract, Accident Year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,223 | 1,250 |  |  |  |  |  |  |  |
IBNR Reserves | $ 378 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 46,364 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 725 | 453 |  |  |  |  |  |  |  |
Package Business [Member] | Short-Duration Insurance Contract, Accident Year 2024 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,356 |  |  |  |  |  |  |  |  |
IBNR Reserves | $ 750 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 42,172 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 415 |  |  |  |  |  |  |  |  |
Property Insurance [Member] | P&C Business Insurance [Member] | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 4,244 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 3,676 |  |  |  |  |  |  |  |  |
Property Insurance [Member] | P&C Business Insurance [Member] | 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 299 | 301 | 301 | 301 | 304 | 305 | 301 | 302 | 301 | 298
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 20,977 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 300 | 301 | 302 | 302 | 303 | 301 | 296 | 284 | 257 | 179
Property Insurance [Member] | P&C Business Insurance [Member] | 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 405 | 405 | 405 | 408 | 408 | 406 | 399 | 419 | 405 |
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 23,927 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 406 | 407 | 406 | 406 | 401 | 395 | 378 | 342 | 215 |
Property Insurance [Member] | P&C Business Insurance [Member] | 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 438 | 439 | 438 | 440 | 438 | 456 | 516 | 577 |  |
IBNR Reserves | $ 2 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 24,627 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 441 | 440 | 438 | 432 | 427 | 411 | 378 | 229 |  |
Property Insurance [Member] | P&C Business Insurance [Member] | 2018 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 393 | 393 | 400 | 403 | 423 | 436 | 450 |  |  |
IBNR Reserves | $ 2 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 21,821 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 394 | 394 | 394 | 385 | 378 | 344 | 188 |  |  |
Property Insurance [Member] | P&C Business Insurance [Member] | 2019 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 420 | 421 | 420 | 418 | 439 | 480 |  |  |  |
IBNR Reserves | $ (1) |  |  |  |  |  |  |  |  |
Claims Reported | claim | 20,981 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 410 | 407 | 405 | 383 | 351 | 215 |  |  |  |
Property Insurance [Member] | P&C Business Insurance [Member] | 2020 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 437 | 438 | 440 | 469 | 501 |  |  |  |  |
IBNR Reserves | $ 49 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 20,529 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 373 | 367 | 355 | 336 | 221 |  |  |  |  |
Property Insurance [Member] | P&C Business Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2021 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 434 | 463 | 500 | 531 |  |  |  |  |  |
IBNR Reserves | $ 15 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 18,283 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 412 | 403 | 383 | 241 |  |  |  |  |  |
Property Insurance [Member] | P&C Business Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2022 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 475 | 481 | 497 |  |  |  |  |  |  |
IBNR Reserves | $ 48 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 17,446 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 412 | 369 | 180 |  |  |  |  |  |  |
Property Insurance [Member] | P&C Business Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 424 | 448 |  |  |  |  |  |  |  |
IBNR Reserves | $ 86 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 17,003 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 300 | 199 |  |  |  |  |  |  |  |
Property Insurance [Member] | P&C Business Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2024 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 519 |  |  |  |  |  |  |  |  |
IBNR Reserves | $ 164 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 15,209 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 228 |  |  |  |  |  |  |  |  |
Property Insurance [Member] | P&C Personal Insurance [Member] | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 5,876 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 5,521 |  |  |  |  |  |  |  |  |
Property Insurance [Member] | P&C Personal Insurance [Member] | 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 682 | 682 | 684 | 684 | 684 | 684 | 684 | 690 | 703 | 690
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 120,023 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 682 | 682 | 682 | 681 | 681 | 680 | 674 | 665 | 645 | 487
Property Insurance [Member] | P&C Personal Insurance [Member] | 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 658 | 658 | 658 | 658 | 658 | 658 | 663 | 673 | 669 |
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 119,818 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 658 | 657 | 656 | 655 | 653 | 649 | 640 | 621 | 481 |
Property Insurance [Member] | P&C Personal Insurance [Member] | 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 769 | 771 | 774 | 775 | 783 | 884 | 889 | 866 |  |
IBNR Reserves | $ 4 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 124,780 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 763 | 761 | 762 | 761 | 757 | 795 | 747 | 538 |  |
Property Insurance [Member] | P&C Personal Insurance [Member] | 2018 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 642 | 645 | 639 | 642 | 673 | 910 | 903 |  |  |
IBNR Reserves | $ 8 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 102,924 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 628 | 626 | 627 | 619 | 616 | 712 | 484 |  |  |
Property Insurance [Member] | P&C Personal Insurance [Member] | 2019 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 465 | 467 | 468 | 470 | 475 | 501 |  |  |  |
IBNR Reserves | $ 1 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 84,810 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 463 | 460 | 458 | 445 | 425 | 318 |  |  |  |
Property Insurance [Member] | P&C Personal Insurance [Member] | 2020 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 499 | 505 | 513 | 512 | 525 |  |  |  |  |
IBNR Reserves | $ 5 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 88,546 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 490 | 486 | 478 | 454 | 335 |  |  |  |  |
Property Insurance [Member] | P&C Personal Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2021 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 485 | 491 | 501 | 502 |  |  |  |  |  |
IBNR Reserves | $ 5 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 77,320 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 473 | 464 | 440 | 305 |  |  |  |  |  |
Property Insurance [Member] | P&C Personal Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2022 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 498 | 507 | 499 |  |  |  |  |  |  |
IBNR Reserves | $ 9 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 64,118 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 476 | 453 | 298 |  |  |  |  |  |  |
Property Insurance [Member] | P&C Personal Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 573 | 584 |  |  |  |  |  |  |  |
IBNR Reserves | $ 28 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 68,405 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 521 | 390 |  |  |  |  |  |  |  |
Property Insurance [Member] | P&C Personal Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2024 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 605 |  |  |  |  |  |  |  |  |
IBNR Reserves | $ 158 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 58,223 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 367 |  |  |  |  |  |  |  |  |
Automobile liability | P&C Business Insurance [Member] | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 4,606 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 3,106 |  |  |  |  |  |  |  |  |
Automobile liability | P&C Business Insurance [Member] | 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 358 | 360 | 358 | 360 | 359 | 356 | 356 | 372 | 358 | 308
IBNR Reserves | $ 5 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 28,750 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 351 | 350 | 348 | 344 | 335 | 314 | 267 | 207 | 142 | 62
Automobile liability | P&C Business Insurance [Member] | 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 395 | 396 | 395 | 395 | 391 | 391 | 390 | 393 | 385 |
IBNR Reserves | $ 5 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 29,266 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 388 | 385 | 379 | 357 | 339 | 303 | 232 | 147 | 65 |
Automobile liability | P&C Business Insurance [Member] | 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 398 | 398 | 394 | 381 | 383 | 379 | 383 | 372 |  |
IBNR Reserves | $ 2 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 26,420 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 389 | 386 | 368 | 328 | 285 | 211 | 134 | 60 |  |
Automobile liability | P&C Business Insurance [Member] | 2018 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 435 | 433 | 424 | 406 | 405 | 396 | 349 |  |  |
IBNR Reserves | $ 18 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 24,816 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 406 | 387 | 360 | 305 | 238 | 153 | 62 |  |  |
Automobile liability | P&C Business Insurance [Member] | 2019 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 479 | 471 | 460 | 450 | 439 | 425 |  |  |  |
IBNR Reserves | $ 20 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 28,627 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 428 | 393 | 327 | 247 | 160 | 67 |  |  |  |
Automobile liability | P&C Business Insurance [Member] | 2020 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 388 | 397 | 419 | 424 | 428 |  |  |  |  |
IBNR Reserves | $ 44 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 22,272 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 317 | 264 | 200 | 119 | 55 |  |  |  |  |
Automobile liability | P&C Business Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2021 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 410 | 429 | 443 | 440 |  |  |  |  |  |
IBNR Reserves | $ 86 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 20,222 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 282 | 212 | 127 | 55 |  |  |  |  |  |
Automobile liability | P&C Business Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2022 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 547 | 500 | 468 |  |  |  |  |  |  |
IBNR Reserves | $ 158 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 20,891 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 294 | 171 | 64 |  |  |  |  |  |  |
Automobile liability | P&C Business Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 555 | 527 |  |  |  |  |  |  |  |
IBNR Reserves | $ 279 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 20,649 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 174 | 69 |  |  |  |  |  |  |  |
Automobile liability | P&C Business Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2024 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 641 |  |  |  |  |  |  |  |  |
IBNR Reserves | $ 501 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 19,954 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 77 |  |  |  |  |  |  |  |  |
Automobile liability | P&C Personal Insurance [Member] | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 10,862 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 9,240 |  |  |  |  |  |  |  |  |
Automobile liability | P&C Personal Insurance [Member] | 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,319 | 1,319 | 1,320 | 1,324 | 1,328 | 1,331 | 1,330 | 1,338 | 1,340 | 1,195
IBNR Reserves | $ 2 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 216,911 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,315 | 1,314 | 1,313 | 1,310 | 1,304 | 1,292 | 1,243 | 1,142 | 935 | 475
Automobile liability | P&C Personal Insurance [Member] | 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,388 | 1,384 | 1,384 | 1,386 | 1,395 | 1,397 | 1,393 | 1,402 | 1,407 |
IBNR Reserves | $ 6 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 215,877 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,380 | 1,377 | 1,373 | 1,363 | 1,345 | 1,308 | 1,188 | 968 | 505 |
Automobile liability | P&C Personal Insurance [Member] | 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,198 | 1,197 | 1,198 | 1,200 | 1,214 | 1,228 | 1,275 | 1,277 |  |
IBNR Reserves | $ 6 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 187,564 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,189 | 1,187 | 1,180 | 1,161 | 1,123 | 1,033 | 836 | 441 |  |
Automobile liability | P&C Personal Insurance [Member] | 2018 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,054 | 1,055 | 1,056 | 1,058 | 1,072 | 1,104 | 1,108 |  |  |
IBNR Reserves | $ 18 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 156,295 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,033 | 1,028 | 1,011 | 965 | 888 | 710 | 359 |  |  |
Automobile liability | P&C Personal Insurance [Member] | 2019 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 967 | 971 | 986 | 991 | 1,010 | 1,018 |  |  |  |
IBNR Reserves | $ 10 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 139,762 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 949 | 933 | 897 | 816 | 654 | 323 |  |  |  |
Automobile liability | P&C Personal Insurance [Member] | 2020 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 740 | 741 | 775 | 782 | 805 |  |  |  |  |
IBNR Reserves | $ 23 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 96,731 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 709 | 679 | 615 | 486 | 238 |  |  |  |  |
Automobile liability | P&C Personal Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2021 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 846 | 852 | 886 | 881 |  |  |  |  |  |
IBNR Reserves | $ 57 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 102,129 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 760 | 691 | 553 | 247 |  |  |  |  |  |
Automobile liability | P&C Personal Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2022 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,009 | 1,018 | 928 |  |  |  |  |  |  |
IBNR Reserves | $ 132 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 107,911 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 813 | 662 | 301 |  |  |  |  |  |  |
Automobile liability | P&C Personal Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,129 | 1,138 |  |  |  |  |  |  |  |
IBNR Reserves | $ 270 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 107,253 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 731 | 329 |  |  |  |  |  |  |  |
Automobile liability | P&C Personal Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2024 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,212 |  |  |  |  |  |  |  |  |
IBNR Reserves | $ 622 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 94,233 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 361 |  |  |  |  |  |  |  |  |
Commercial automobile physical damage | P&C Business Insurance [Member] | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 239 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 213 |  |  |  |  |  |  |  |  |
Commercial automobile physical damage | P&C Business Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2022 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 74 | 74 | 70 |  |  |  |  |  |  |
IBNR Reserves | $ 2 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 16,771 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 72 | 73 | 59 |  |  |  |  |  |  |
Commercial automobile physical damage | P&C Business Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 81 | 80 |  |  |  |  |  |  |  |
IBNR Reserves | $ 6 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 16,832 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 74 | 61 |  |  |  |  |  |  |  |
Commercial automobile physical damage | P&C Business Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2024 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 84 |  |  |  |  |  |  |  |  |
IBNR Reserves | $ 8 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 15,533 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 67 |  |  |  |  |  |  |  |  |
Professional liability | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 3,042 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,567 |  |  |  |  |  |  |  |  |
Professional liability | 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 192 | 197 | 196 | 198 | 206 | 213 | 190 | 179 | 174 | 164
IBNR Reserves | $ 1 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 7,279 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 181 | 185 | 175 | 163 | 140 | 124 | 107 | 85 | 40 | 9
Professional liability | 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 202 | 191 | 193 | 195 | 194 | 196 | 203 | 176 | 183 |
IBNR Reserves | $ 20 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 8,462 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 175 | 176 | 166 | 147 | 124 | 111 | 88 | 51 | 8 |
Professional liability | 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 227 | 217 | 242 | 239 | 225 | 231 | 203 | 205 |  |
IBNR Reserves | $ 14 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 9,555 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 189 | 190 | 179 | 149 | 121 | 87 | 48 | 11 |  |
Professional liability | 2018 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 312 | 324 | 265 | 271 | 270 | 274 | 243 |  |  |
IBNR Reserves | $ 18 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 9,910 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 260 | 232 | 194 | 161 | 127 | 71 | 15 |  |  |
Professional liability | 2019 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 385 | 354 | 347 | 330 | 313 | 295 |  |  |  |
IBNR Reserves | $ 81 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 9,972 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 265 | 241 | 197 | 147 | 77 | 21 |  |  |  |
Professional liability | 2020 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 298 | 324 | 336 | 363 | 369 |  |  |  |  |
IBNR Reserves | $ 106 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 8,034 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 171 | 147 | 117 | 71 | 19 |  |  |  |  |
Professional liability | Short-Duration Insurance Contract, Accident Year 2021 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 306 | 327 | 343 | 339 |  |  |  |  |  |
IBNR Reserves | $ 149 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 6,761 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 127 | 95 | 55 | 15 |  |  |  |  |  |
Professional liability | Short-Duration Insurance Contract, Accident Year 2022 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 338 | 355 | 349 |  |  |  |  |  |  |
IBNR Reserves | $ 214 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 7,177 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 95 | 64 | 18 |  |  |  |  |  |  |
Professional liability | Short-Duration Insurance Contract, Accident Year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 388 | 384 |  |  |  |  |  |  |  |
IBNR Reserves | $ 260 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 8,049 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 76 | 20 |  |  |  |  |  |  |  |
Professional liability | Short-Duration Insurance Contract, Accident Year 2024 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 394 |  |  |  |  |  |  |  |  |
IBNR Reserves | $ 337 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 7,546 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 28 |  |  |  |  |  |  |  |  |
Surety Product Line [Member] | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 667 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 276 |  |  |  |  |  |  |  |  |
Surety Product Line [Member] | 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 29 | 37 | 42 | 47 | 48 | 54 | 60 | 63 | 67 | 67
IBNR Reserves | $ 4 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 1,413 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 25 | 25 | 25 | 30 | 32 | 34 | 31 | 24 | 20 | 9
Surety Product Line [Member] | 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 28 | 34 | 37 | 45 | 51 | 55 | 61 | 61 | 61 |
IBNR Reserves | $ 8 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 1,348 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 20 | 20 | 22 | 22 | 22 | 20 | 15 | 12 | 2 |
Surety Product Line [Member] | 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 65 | 68 | 70 | 79 | 94 | 101 | 90 | 63 |  |
IBNR Reserves | $ 22 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 1,799 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 43 | 43 | 43 | 42 | 54 | 55 | 46 | 5 |  |
Surety Product Line [Member] | 2018 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 54 | 63 | 70 | 71 | 72 | 68 | 68 |  |  |
IBNR Reserves | $ 24 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 1,750 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 29 | 30 | 29 | 24 | 23 | 16 | 6 |  |  |
Surety Product Line [Member] | 2019 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 61 | 70 | 73 | 74 | 73 | 72 |  |  |  |
IBNR Reserves | $ 44 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 1,925 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 17 | 16 | 16 | 15 | 13 | 3 |  |  |  |
Surety Product Line [Member] | 2020 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 80 | 83 | 79 | 84 | 83 |  |  |  |  |
IBNR Reserves | $ 51 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 2,294 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 27 | 26 | 21 | 12 | 4 |  |  |  |  |
Surety Product Line [Member] | Short-Duration Insurance Contract, Accident Year 2021 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 84 | 88 | 85 | 85 |  |  |  |  |  |
IBNR Reserves | $ 55 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 2,989 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 29 | 23 | 21 | 8 |  |  |  |  |  |
Surety Product Line [Member] | Short-Duration Insurance Contract, Accident Year 2022 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 93 | 93 | 85 |  |  |  |  |  |  |
IBNR Reserves | $ 29 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 2,571 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 59 | 42 | 11 |  |  |  |  |  |  |
Surety Product Line [Member] | Short-Duration Insurance Contract, Accident Year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 83 | 81 |  |  |  |  |  |  |  |
IBNR Reserves | $ 63 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 1,647 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 17 | 8 |  |  |  |  |  |  |  |
Surety Product Line [Member] | Short-Duration Insurance Contract, Accident Year 2024 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 90 |  |  |  |  |  |  |  |  |
IBNR Reserves | $ 78 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 975 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 10 |  |  |  |  |  |  |  |  |
Assumed Reinsurance [Member] | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 2,107 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,356 |  |  |  |  |  |  |  |  |
Assumed Reinsurance [Member] | 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 96 | 96 | 96 | 96 | 96 | 95 | 94 | 94 | 92 | 102
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 1,737 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 96 | 96 | 95 | 95 | 94 | 91 | 83 | 77 | 64 | $ 42
Assumed Reinsurance [Member] | 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 104 | 104 | 102 | 101 | 102 | 100 | 98 | 91 | 88 |
IBNR Reserves | $ (1) |  |  |  |  |  |  |  |  |
Claims Reported | claim | 1,996 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 101 | 101 | 99 | 97 | 95 | 90 | 84 | 66 | $ 36 |
Assumed Reinsurance [Member] | 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 155 | 155 | 155 | 153 | 157 | 161 | 153 | 129 |  |
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 2,596 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 150 | 151 | 149 | 147 | 145 | 135 | 116 | $ 44 |  |
Assumed Reinsurance [Member] | 2018 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 132 | 132 | 135 | 134 | 129 | 127 | 128 |  |  |
IBNR Reserves | $ (6) |  |  |  |  |  |  |  |  |
Claims Reported | claim | 3,078 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 133 | 144 | 141 | 139 | 133 | 111 | $ 25 |  |  |
Assumed Reinsurance [Member] | 2019 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 208 | 208 | 190 | 186 | 189 | 181 |  |  |  |
IBNR Reserves | $ 11 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 3,843 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 185 | 176 | 159 | 153 | 132 | $ 62 |  |  |  |
Assumed Reinsurance [Member] | 2020 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 181 | 178 | 186 | 180 | 183 |  |  |  |  |
IBNR Reserves | $ 11 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 3,374 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 151 | 132 | 113 | 89 | $ 49 |  |  |  |  |
Assumed Reinsurance [Member] | Short-Duration Insurance Contract, Accident Year 2021 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 204 | 203 | 195 | 191 |  |  |  |  |  |
IBNR Reserves | $ 22 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 2,698 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 157 | 132 | 102 | $ 46 |  |  |  |  |  |
Assumed Reinsurance [Member] | Short-Duration Insurance Contract, Accident Year 2022 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 290 | 274 | 266 |  |  |  |  |  |  |
IBNR Reserves | $ 84 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 2,501 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 173 | 128 | 60 |  |  |  |  |  |  |
Assumed Reinsurance [Member] | Short-Duration Insurance Contract, Accident Year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 327 | 329 |  |  |  |  |  |  |  |
IBNR Reserves | $ 112 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 2,354 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 149 | 63 |  |  |  |  |  |  |  |
Assumed Reinsurance [Member] | Short-Duration Insurance Contract, Accident Year 2024 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 410 |  |  |  |  |  |  |  |  |
IBNR Reserves | $ 297 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 1,049 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 61 |  |  |  |  |  |  |  |  |
Personal automobile physical damage | P&C Personal Insurance [Member] | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,640 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,574 |  |  |  |  |  |  |  |  |
Personal automobile physical damage | P&C Personal Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2022 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 539 | 549 | 533 |  |  |  |  |  |  |
IBNR Reserves | $ 3 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 239,634 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 536 | 538 | $ 498 |  |  |  |  |  |  |
Personal automobile physical damage | P&C Personal Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 544 | 574 |  |  |  |  |  |  |  |
IBNR Reserves | $ 3 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 234,247 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 541 | $ 513 |  |  |  |  |  |  |  |
Personal automobile physical damage | P&C Personal Insurance [Member] | Short-Duration Insurance Contract, Accident Year 2024 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 557 |  |  |  |  |  |  |  |  |
IBNR Reserves | $ 28 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 199,915 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 497 |  |  |  |  |  |  |  |  |

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