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Liability For Unpaid Claims And Claim Adjustment Expenses - Incurred and Paid Claims Development (Details) $ in Millions | Dec. 31, 2024 USD ($) claim | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | May 25, 2022 USD ($) | May 24, 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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Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 7 | $ 4 |  |  |  |  |  |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 1,338 | 1,355 | $ 1,263 | $ 1,215 | $ 1,215 | $ 1,167 |  |  |  |  |  |
Liability |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 4,425 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 3,410 |  |  |  |  |  |  |  |  |  |  |
All outstanding liabilities before 2015, net of reinsurance | 26 |  |  |  |  |  |  |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 1,041 |  |  |  |  |  |  |  |  |  |  |
Professional |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 9 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 7 |  |  |  |  |  |  |  |  |  |  |
All outstanding liabilities before 2015, net of reinsurance | 0 |  |  |  |  |  |  |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 2 |  |  |  |  |  |  |  |  |  |  |
Property |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 4,881 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 4,683 |  |  |  |  |  |  |  |  |  |  |
All outstanding liabilities before 2015, net of reinsurance | 0 |  |  |  |  |  |  |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 198 |  |  |  |  |  |  |  |  |  |  |
Specialty |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 684 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 680 |  |  |  |  |  |  |  |  |  |  |
All outstanding liabilities before 2015, net of reinsurance | 0 |  |  |  |  |  |  |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 4 |  |  |  |  |  |  |  |  |  |  |
2015 | Liability |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 338 | 339 | 340 |  |  | 341 | $ 341 | $ 340 | $ 346 | $ 345 | $ 351 | $ 355
IBNR & Expected Development on Reported Losses | $ 2 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 43,968 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 332 | 329 | 327 |  |  | 324 | 318 | 308 | 280 | 240 | 186 | 101
2015 | Professional |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1 | 1 | 1 |  |  | 1 | 1 | 1 | 1 | 1 | 1 | 1
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 71 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 1 | 1 | 1 |  |  | 1 | 1 | 1 | 1 | 1 | 1 | 0
2015 | Property |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 322 | 322 | 322 |  |  | 322 | 322 | 322 | 323 | 323 | 324 | 328
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 77,339 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 322 | 322 | 322 |  |  | 322 | 322 | 321 | 321 | 318 | 313 | 269
2015 | Specialty |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 46 | 46 | 46 |  |  | 46 | 46 | 46 | 46 | 46 | 46 | 47
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 20,776 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 46 | 46 | 46 |  |  | 46 | 46 | 46 | 46 | 46 | 46 | $ 35
2016 | Liability |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 355 | 357 | 358 |  |  | 356 | 359 | 364 | 368 | 373 | 384 |
IBNR & Expected Development on Reported Losses | $ 2 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 46,601 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 346 | 342 | 338 |  |  | 330 | 314 | 294 | 253 | 196 | 111 |
2016 | Professional |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1 | 1 | 1 |  |  | 1 | 1 | 1 | 1 | 1 | 1 |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 62 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 1 | 1 | 1 |  |  | 1 | 1 | 1 | 1 | 0 | 0 |
2016 | Property |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 360 | 360 | 360 |  |  | 360 | 360 | 360 | 359 | 361 | 363 |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 86,839 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 360 | 360 | 360 |  |  | 360 | 359 | 358 | 355 | 350 | 298 |
2016 | Specialty |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 76 | 76 | 76 |  |  | 76 | 76 | 76 | 76 | 76 | 76 |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 26,657 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 76 | 76 | 76 |  |  | 76 | 76 | 76 | 76 | 76 | $ 60 |
2017 | Liability |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 391 | 391 | 393 |  |  | 395 | 394 | 398 | 406 | 415 |  |
IBNR & Expected Development on Reported Losses | $ 5 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 53,691 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 374 | 366 | 359 |  |  | 344 | 322 | 290 | 233 | 116 |  |
2017 | Professional |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1 | 1 | 1 |  |  | 1 | 1 | 1 | 1 | 1 |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 66 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 1 | 1 | 1 |  |  | 1 | 1 | 0 | 0 | 0 |  |
2017 | Property |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 394 | 394 | 394 |  |  | 394 | 395 | 398 | 399 | 393 |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 106,058 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 394 | 393 | 393 |  |  | 393 | 393 | 391 | 384 | 321 |  |
2017 | Specialty |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 95 | 95 | 95 |  |  | 95 | 95 | 95 | 95 | 95 |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 31,886 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 95 | 95 | 95 |  |  | 95 | 95 | 95 | 95 | $ 74 |  |
2018 | Liability |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 393 | 396 | 403 |  |  | 409 | 420 | 436 | 454 |  |  |
IBNR & Expected Development on Reported Losses | $ 6 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 57,338 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 374 | 362 | 353 |  |  | 329 | 297 | 242 | 127 |  |  |
2018 | Professional |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1 | 1 | 1 |  |  | 1 | 1 | 1 | 1 |  |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 57 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 1 | 1 | 1 |  |  | 1 | 1 | 1 | 0 |  |  |
2018 | Property |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 420 | 420 | 420 |  |  | 420 | 419 | 423 | 423 |  |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 89,497 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 420 | 419 | 419 |  |  | 416 | 413 | 407 | 340 |  |  |
2018 | Specialty |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 90 | 90 | 90 |  |  | 90 | 90 | 90 | 90 |  |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 30,505 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 90 | 90 | 90 |  |  | 90 | 90 | 90 | $ 73 |  |  |
2019 | Liability |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 428 | 435 | 443 |  |  | 456 | 469 | 483 |  |  |  |
IBNR & Expected Development on Reported Losses | $ 13 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 52,054 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 395 | 378 | 350 |  |  | 310 | 256 | 133 |  |  |  |
2019 | Professional |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1 | 1 | 1 |  |  | 1 | 1 | 1 |  |  |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 53 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 1 | 1 | 1 |  |  | 1 | 1 | 1 |  |  |  |
2019 | Property |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 416 | 416 | 416 |  |  | 415 | 418 | 425 |  |  |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 86,169 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 416 | 415 | 413 |  |  | 409 | 402 | 341 |  |  |  |
2019 | Specialty |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 83 | 83 | 83 |  |  | 83 | 83 | 83 |  |  |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 27,523 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 83 | 83 | 83 |  |  | 83 | 83 | $ 61 |  |  |  |
2020 | Liability |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 366 | 374 | 386 |  |  | 401 | 436 |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 16 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 40,918 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 326 | 300 | 264 |  |  | 214 | 114 |  |  |  |  |
2020 | Professional |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1 | 1 | 1 |  |  | 1 | 1 |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 53 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 1 | 1 | 1 |  |  | 1 | 1 |  |  |  |  |
2020 | Property |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 461 | 459 | 457 |  |  | 458 | 465 |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 78,223 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 459 | 455 | 452 |  |  | 445 | 370 |  |  |  |  |
2020 | Specialty |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 69 | 69 | 69 |  |  | 69 | 70 |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 27,183 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 69 | 69 | 69 |  |  | 68 | $ 48 |  |  |  |  |
2021 | Liability |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 467 | 477 | 488 |  |  | 498 |  |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 35 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 45,025 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 375 | 330 | 272 |  |  | 140 |  |  |  |  |  |
2021 | Professional |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 0 | 1 | 0 |  |  | 1 |  |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 46 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 0 | 0 | 0 |  |  | 0 |  |  |  |  |  |
2021 | Property |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 513 | 514 | 515 |  |  | 510 |  |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 1 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 78,859 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 510 | 508 | 500 |  |  | 411 |  |  |  |  |  |
2021 | Specialty |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 47 | 47 | 47 |  |  | 55 |  |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 20,482 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 47 | 47 | 46 |  |  | $ 36 |  |  |  |  |  |
2022 | Liability |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 519 | 530 | 548 |  |  |  |  |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 66 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 42,831 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 370 | 296 | 153 |  |  |  |  |  |  |  |  |
2022 | Professional |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1 | 1 | 1 |  |  |  |  |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 30 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 1 | 1 | 1 |  |  |  |  |  |  |  |  |
2022 | Property |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 601 | 599 | 590 |  |  |  |  |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 4 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 79,859 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 590 | 581 | 472 |  |  |  |  |  |  |  |  |
2022 | Specialty |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 56 | 57 | 62 |  |  |  |  |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 17,889 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 56 | 55 | $ 41 |  |  |  |  |  |  |  |  |
2023 | Liability |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 599 | 603 |  |  |  |  |  |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 107 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 52,816 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 351 | 189 |  |  |  |  |  |  |  |  |  |
2023 | Professional |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1 | 0 |  |  |  |  |  |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 27 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 0 | 0 |  |  |  |  |  |  |  |  |  |
2023 | Property |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 716 | 726 |  |  |  |  |  |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 13 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 91,921 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 685 | 568 |  |  |  |  |  |  |  |  |  |
2023 | Specialty |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 108 | 106 |  |  |  |  |  |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 1 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 23,351 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 105 | $ 78 |  |  |  |  |  |  |  |  |  |
2024 | Liability |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 569 |  |  |  |  |  |  |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 219 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 51,650 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 167 |  |  |  |  |  |  |  |  |  |  |
2024 | Professional |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1 |  |  |  |  |  |  |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 0 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 27 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 0 |  |  |  |  |  |  |  |  |  |  |
2024 | Property |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 678 |  |  |  |  |  |  |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 60 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 78,320 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 527 |  |  |  |  |  |  |  |  |  |  |
2024 | Specialty |  |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 14 |  |  |  |  |  |  |  |  |  |  |
IBNR & Expected Development on Reported Losses | $ 1 |  |  |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 19,247 |  |  |  |  |  |  |  |  |  |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 13 |  |  |  |  |  |  |  |  |  |  |

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