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Insurance Claim Reserves (Details) - Claim Development
$ in Millions
Dec. 31, 2024
USD ($)
claims
Dec. 31, 2023
USD ($)
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 ($)
Dec. 31, 2015
USD ($)
Claims Development                    
Total net liability (Audited) $ 57,447                  
Property-casualty [Member]                    
Claims Development                    
Total net liability (Audited) 57,447                  
Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 16,443                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 8,550                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 7,893                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 3,207                  
Total net liability (Audited) 11,100                  
Business Insurance [Member] | Commercial property [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 6,274                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 5,106                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 1,168                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 98                  
Total net liability (Audited) 1,266                  
Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 21,811                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 16,391                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 5,420                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 338                  
Total net liability (Audited) 5,758                  
Business Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 10,167                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 5,684                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 4,483                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 308                  
Total net liability (Audited) 4,791                  
Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 22,352                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 12,857                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 9,495                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 6,262                  
Total net liability (Audited) 15,757                  
Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 6,754                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 4,147                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 2,607                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 74                  
Total net liability (Audited) 2,681                  
Bond & Specialty Insurance [Member] | Fidelity and surety [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,217                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 537                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 680                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 34                  
Total net liability (Audited) 714                  
Personal Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 21,460                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 17,356                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 4,104                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 198                  
Total net liability (Audited) 4,302                  
Personal Insurance [Member] | Homeowners (excluding Other) [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 20,467                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 18,223                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 2,244                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 31                  
Total net liability (Audited) 2,275                  
Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 3,738                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 2,962                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 776                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 19                  
Total net liability (Audited) 795                  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,100 $ 1,110 $ 1,082 $ 1,072 $ 1,087 $ 1,057 $ 967 $ 923 $ 956 $ 998
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,002 975 927 875 828 740 558 336 137 36
IBNR Reserves Dec. 31, 2024 (Audited) $ 70                  
Cumulative Number of Reported Claims (Audited) | claims 22,069                  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 1,564 1,563 1,571 1,584 1,593 1,606 1,597 1,593 1,625 1,568
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,535 1,523 1,512 1,489 1,452 1,409 1,310 1,144 970 595
IBNR Reserves Dec. 31, 2024 (Audited) $ 14                  
Cumulative Number of Reported Claims (Audited) | claims 73,061                  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,050 2,097 2,155 2,220 2,279 2,372 2,441 2,505 2,585 2,644
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,592 1,574 1,547 1,520 1,470 1,411 1,310 1,154 893 430
IBNR Reserves Dec. 31, 2024 (Audited) $ 292                  
Cumulative Number of Reported Claims (Audited) | claims 131,266                  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 411 407 414 413 414 395 437 486 524 528
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 392 387 383 381 348 338 310 234 141 38
IBNR Reserves Dec. 31, 2024 (Audited) $ 8                  
Cumulative Number of Reported Claims (Audited) | claims 4,235                  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 318 318 317 317 322 322 321 324 325 325
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 314 311 309 302 290 276 255 228 203 $ 146
IBNR Reserves Dec. 31, 2024 (Audited) $ (1)                  
Cumulative Number of Reported Claims (Audited) | claims 44,956                  
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 1,173 1,183 1,185 1,179 1,204 1,187 1,087 1,058 1,075  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,031 991 951 858 758 649 421 191 35  
IBNR Reserves Dec. 31, 2024 (Audited) $ 99                  
Cumulative Number of Reported Claims (Audited) | claims 20,947                  
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 1,590 1,578 1,579 1,587 1,601 1,590 1,598 1,623 1,662  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,547 1,510 1,477 1,437 1,373 1,278 1,133 950 585  
IBNR Reserves Dec. 31, 2024 (Audited) $ 19                  
Cumulative Number of Reported Claims (Audited) | claims 69,612                  
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,111 2,151 2,235 2,300 2,372 2,473 2,569 2,690 2,768  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,553 1,522 1,486 1,433 1,367 1,272 1,118 873 421  
IBNR Reserves Dec. 31, 2024 (Audited) $ 262                  
Cumulative Number of Reported Claims (Audited) | claims 132,057                  
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 512 509 511 510 514 520 504 511 512  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 479 472 463 446 378 313 233 141 30  
IBNR Reserves Dec. 31, 2024 (Audited) $ 20                  
Cumulative Number of Reported Claims (Audited) | claims 4,419                  
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 380 379 378 376 377 377 369 369 325  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 370 364 358 347 331 310 279 255 $ 190  
IBNR Reserves Dec. 31, 2024 (Audited) $ (2)                  
Cumulative Number of Reported Claims (Audited) | claims 45,503                  
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 1,306 1,288 1,243 1,226 1,234 1,196 1,143 1,133    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,111 1,029 914 724 552 378 180 40    
IBNR Reserves Dec. 31, 2024 (Audited) $ 117                  
Cumulative Number of Reported Claims (Audited) | claims 19,913                  
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 1,928 1,930 1,943 1,935 1,919 1,956 1,928 1,872    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,843 1,815 1,763 1,674 1,531 1,388 1,199 716    
IBNR Reserves Dec. 31, 2024 (Audited) $ 43                  
Cumulative Number of Reported Claims (Audited) | claims 72,767                  
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,190 2,243 2,342 2,439 2,483 2,584 2,681 2,779    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,585 1,544 1,490 1,418 1,314 1,154 890 433    
IBNR Reserves Dec. 31, 2024 (Audited) $ 338                  
Cumulative Number of Reported Claims (Audited) | claims 129,935                  
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 582 565 554 524 493 526 517 534    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 513 488 450 404 340 262 155 38    
IBNR Reserves Dec. 31, 2024 (Audited) $ 43                  
Cumulative Number of Reported Claims (Audited) | claims 4,623                  
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 363 369 366 363 363 363 343 312    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 352 344 332 313 289 267 231 $ 164    
IBNR Reserves Dec. 31, 2024 (Audited) $ (3)                  
Cumulative Number of Reported Claims (Audited) | claims 46,522                  
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 1,571 1,530 1,477 1,395 1,344 1,312 1,253      
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,270 1,146 939 709 441 202 42      
IBNR Reserves Dec. 31, 2024 (Audited) $ 134                  
Cumulative Number of Reported Claims (Audited) | claims 20,059                  
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,125 2,127 2,121 2,112 2,092 2,114 1,976      
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,986 1,917 1,815 1,669 1,500 1,302 792      
IBNR Reserves Dec. 31, 2024 (Audited) $ 56                  
Cumulative Number of Reported Claims (Audited) | claims 80,273                  
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,245 2,318 2,416 2,503 2,599 2,687 2,744      
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,578 1,516 1,440 1,330 1,169 919 440      
IBNR Reserves Dec. 31, 2024 (Audited) $ 381                  
Cumulative Number of Reported Claims (Audited) | claims 132,125                  
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 636 612 605 595 585 548 530      
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 559 504 458 383 290 182 49      
IBNR Reserves Dec. 31, 2024 (Audited) $ 42                  
Cumulative Number of Reported Claims (Audited) | claims 4,890                  
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 424 427 425 422 418 416 396      
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 399 386 370 342 306 275 $ 197      
IBNR Reserves Dec. 31, 2024 (Audited) $ (3)                  
Cumulative Number of Reported Claims (Audited) | claims 50,329                  
Short-duration Insurance Contracts, Accident Year 2019 [Member] | Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 1,698 1,706 1,567 1,498 1,486 1,447        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,276 1,074 816 482 233 51        
IBNR Reserves Dec. 31, 2024 (Audited) $ 216                  
Cumulative Number of Reported Claims (Audited) | claims 19,730                  
Short-duration Insurance Contracts, Accident Year 2019 [Member] | Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,110 2,103 2,103 2,089 2,087 2,017        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,916 1,801 1,628 1,423 1,187 707        
IBNR Reserves Dec. 31, 2024 (Audited) $ 78                  
Cumulative Number of Reported Claims (Audited) | claims 75,593                  
Short-duration Insurance Contracts, Accident Year 2019 [Member] | Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,424 2,521 2,632 2,699 2,714 2,680        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,593 1,518 1,402 1,229 951 466        
IBNR Reserves Dec. 31, 2024 (Audited) $ 463                  
Cumulative Number of Reported Claims (Audited) | claims 126,972                  
Short-duration Insurance Contracts, Accident Year 2019 [Member] | Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 654 662 670 665 653 588        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 554 513 410 323 189 51        
IBNR Reserves Dec. 31, 2024 (Audited) $ 47                  
Cumulative Number of Reported Claims (Audited) | claims 5,503                  
Short-duration Insurance Contracts, Accident Year 2019 [Member] | Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 424 419 418 415 396 401        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 380 356 328 293 260 $ 194        
IBNR Reserves Dec. 31, 2024 (Audited) $ 9                  
Cumulative Number of Reported Claims (Audited) | claims 47,920                  
Short-duration Insurance Contracts, Accident Year 2020 [Member] | Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 1,568 1,577 1,470 1,493 1,467          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,031 770 458 244 61          
IBNR Reserves Dec. 31, 2024 (Audited) $ 322                  
Cumulative Number of Reported Claims (Audited) | claims 19,208                  
Short-duration Insurance Contracts, Accident Year 2020 [Member] | Business Insurance [Member] | Commercial property [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 983 993 1,005 1,025 1,107          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 939 932 907 857 580          
IBNR Reserves Dec. 31, 2024 (Audited) $ 33                  
Cumulative Number of Reported Claims (Audited) | claims 25,713                  
Short-duration Insurance Contracts, Accident Year 2020 [Member] | Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,061 2,111 2,126 2,141 2,142          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,687 1,547 1,373 1,180 791          
IBNR Reserves Dec. 31, 2024 (Audited) $ 216                  
Cumulative Number of Reported Claims (Audited) | claims 70,726                  
Short-duration Insurance Contracts, Accident Year 2020 [Member] | Business Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 1,551 1,558 1,621 1,677 1,788          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,345 1,192 958 696 437          
IBNR Reserves Dec. 31, 2024 (Audited) $ 102                  
Cumulative Number of Reported Claims (Audited) | claims 143,151                  
Short-duration Insurance Contracts, Accident Year 2020 [Member] | Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,152 2,271 2,433 2,530 2,559          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,273 1,164 1,017 794 389          
IBNR Reserves Dec. 31, 2024 (Audited) $ 519                  
Cumulative Number of Reported Claims (Audited) | claims 98,066                  
Short-duration Insurance Contracts, Accident Year 2020 [Member] | Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 684 698 741 753 772          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 525 447 333 210 52          
IBNR Reserves Dec. 31, 2024 (Audited) $ 108                  
Cumulative Number of Reported Claims (Audited) | claims 5,501                  
Short-duration Insurance Contracts, Accident Year 2020 [Member] | Bond & Specialty Insurance [Member] | Fidelity and surety [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 206 222 219 203 274          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 139 125 110 79 50          
IBNR Reserves Dec. 31, 2024 (Audited) $ 49                  
Cumulative Number of Reported Claims (Audited) | claims 816                  
Short-duration Insurance Contracts, Accident Year 2020 [Member] | Personal Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,695 2,717 2,729 2,764 2,829          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 2,631 2,561 2,411 2,126 1,571          
IBNR Reserves Dec. 31, 2024 (Audited) $ 26                  
Cumulative Number of Reported Claims (Audited) | claims 811,007                  
Short-duration Insurance Contracts, Accident Year 2020 [Member] | Personal Insurance [Member] | Homeowners (excluding Other) [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,859 2,869 2,909 2,967 3,019          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 2,823 2,802 2,755 2,673 2,019          
IBNR Reserves Dec. 31, 2024 (Audited) $ 16                  
Cumulative Number of Reported Claims (Audited) | claims 221,346                  
Short-duration Insurance Contracts, Accident Year 2020 [Member] | Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 281 283 288 301 313          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 233 214 196 175 $ 130          
IBNR Reserves Dec. 31, 2024 (Audited) $ 10                  
Cumulative Number of Reported Claims (Audited) | claims 30,038                  
Short-duration Insurance Contracts, Accident Year 2021 [Member] | Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 1,711 1,628 1,589 1,591            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 826 493 231 67            
IBNR Reserves Dec. 31, 2024 (Audited) $ 575                  
Cumulative Number of Reported Claims (Audited) | claims 15,694                  
Short-duration Insurance Contracts, Accident Year 2021 [Member] | Business Insurance [Member] | Commercial property [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 1,201 1,190 1,190 1,236            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,169 1,141 1,068 645            
IBNR Reserves Dec. 31, 2024 (Audited) $ (5)                  
Cumulative Number of Reported Claims (Audited) | claims 25,796                  
Short-duration Insurance Contracts, Accident Year 2021 [Member] | Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,107 2,097 2,097 2,164            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,616 1,437 1,206 744            
IBNR Reserves Dec. 31, 2024 (Audited) $ 238                  
Cumulative Number of Reported Claims (Audited) | claims 58,432                  
Short-duration Insurance Contracts, Accident Year 2021 [Member] | Business Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 1,800 1,786 1,757 1,741            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,405 1,135 800 453            
IBNR Reserves Dec. 31, 2024 (Audited) $ 181                  
Cumulative Number of Reported Claims (Audited) | claims 149,164                  
Short-duration Insurance Contracts, Accident Year 2021 [Member] | Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,237 2,294 2,349 2,356            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,234 1,076 848 427            
IBNR Reserves Dec. 31, 2024 (Audited) $ 555                  
Cumulative Number of Reported Claims (Audited) | claims 95,805                  
Short-duration Insurance Contracts, Accident Year 2021 [Member] | Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 659 683 756 812            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 401 316 210 78            
IBNR Reserves Dec. 31, 2024 (Audited) $ 151                  
Cumulative Number of Reported Claims (Audited) | claims 5,712                  
Short-duration Insurance Contracts, Accident Year 2021 [Member] | Bond & Specialty Insurance [Member] | Fidelity and surety [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 87 93 172 284            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 58 57 50 25            
IBNR Reserves Dec. 31, 2024 (Audited) $ 28                  
Cumulative Number of Reported Claims (Audited) | claims 609                  
Short-duration Insurance Contracts, Accident Year 2021 [Member] | Personal Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 3,724 3,751 3,770 3,716            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 3,541 3,350 2,981 2,062            
IBNR Reserves Dec. 31, 2024 (Audited) $ 82                  
Cumulative Number of Reported Claims (Audited) | claims 1,000,923                  
Short-duration Insurance Contracts, Accident Year 2021 [Member] | Personal Insurance [Member] | Homeowners (excluding Other) [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 3,423 3,444 3,486 3,463            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 3,372 3,344 3,235 2,334            
IBNR Reserves Dec. 31, 2024 (Audited) $ 22                  
Cumulative Number of Reported Claims (Audited) | claims 233,960                  
Short-duration Insurance Contracts, Accident Year 2021 [Member] | Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 292 295 302 314            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 216 197 170 $ 115            
IBNR Reserves Dec. 31, 2024 (Audited) $ 23                  
Cumulative Number of Reported Claims (Audited) | claims 28,054                  
Short-duration Insurance Contracts, Accident Year 2022 [Member] | Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 1,916 1,736 1,696              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 668 302 81              
IBNR Reserves Dec. 31, 2024 (Audited) $ 851                  
Cumulative Number of Reported Claims (Audited) | claims 18,258                  
Short-duration Insurance Contracts, Accident Year 2022 [Member] | Business Insurance [Member] | Commercial property [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 1,372 1,369 1,309              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,247 1,113 624              
IBNR Reserves Dec. 31, 2024 (Audited) $ 3                  
Cumulative Number of Reported Claims (Audited) | claims 28,896                  
Short-duration Insurance Contracts, Accident Year 2022 [Member] | Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,569 2,533 2,502              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,752 1,476 817              
IBNR Reserves Dec. 31, 2024 (Audited) $ 436                  
Cumulative Number of Reported Claims (Audited) | claims 54,444                  
Short-duration Insurance Contracts, Accident Year 2022 [Member] | Business Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,050 2,040 1,939              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,324 966 540              
IBNR Reserves Dec. 31, 2024 (Audited) $ 365                  
Cumulative Number of Reported Claims (Audited) | claims 160,389                  
Short-duration Insurance Contracts, Accident Year 2022 [Member] | Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,226 2,294 2,293              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,081 830 388              
IBNR Reserves Dec. 31, 2024 (Audited) $ 676                  
Cumulative Number of Reported Claims (Audited) | claims 103,114                  
Short-duration Insurance Contracts, Accident Year 2022 [Member] | Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 727 763 803              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 335 212 69              
IBNR Reserves Dec. 31, 2024 (Audited) $ 264                  
Cumulative Number of Reported Claims (Audited) | claims 5,098                  
Short-duration Insurance Contracts, Accident Year 2022 [Member] | Bond & Specialty Insurance [Member] | Fidelity and surety [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 187 261 310              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 99 82 36              
IBNR Reserves Dec. 31, 2024 (Audited) $ 71                  
Cumulative Number of Reported Claims (Audited) | claims 744                  
Short-duration Insurance Contracts, Accident Year 2022 [Member] | Personal Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 4,729 4,784 4,755              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 4,278 3,855 2,683              
IBNR Reserves Dec. 31, 2024 (Audited) $ 219                  
Cumulative Number of Reported Claims (Audited) | claims 1,131,357                  
Short-duration Insurance Contracts, Accident Year 2022 [Member] | Personal Insurance [Member] | Homeowners (excluding Other) [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 4,146 4,184 4,277              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 4,018 3,828 2,537              
IBNR Reserves Dec. 31, 2024 (Audited) $ 43                  
Cumulative Number of Reported Claims (Audited) | claims 235,908                  
Short-duration Insurance Contracts, Accident Year 2022 [Member] | Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 360 356 349              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 248 220 $ 152              
IBNR Reserves Dec. 31, 2024 (Audited) $ 35                  
Cumulative Number of Reported Claims (Audited) | claims 33,023                  
Short-duration Insurance Contracts, Accident Year 2023 [Member] | Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,060 1,998                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 280 54                
IBNR Reserves Dec. 31, 2024 (Audited) $ 1,432                  
Cumulative Number of Reported Claims (Audited) | claims 16,973                  
Short-duration Insurance Contracts, Accident Year 2023 [Member] | Business Insurance [Member] | Commercial property [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 1,244 1,268                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,049 614                
IBNR Reserves Dec. 31, 2024 (Audited) $ 7                  
Cumulative Number of Reported Claims (Audited) | claims 29,166                  
Short-duration Insurance Contracts, Accident Year 2023 [Member] | Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,811 2,781                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,603 935                
IBNR Reserves Dec. 31, 2024 (Audited) $ 716                  
Cumulative Number of Reported Claims (Audited) | claims 52,398                  
Short-duration Insurance Contracts, Accident Year 2023 [Member] | Business Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,222 2,245                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 1,006 589                
IBNR Reserves Dec. 31, 2024 (Audited) $ 744                  
Cumulative Number of Reported Claims (Audited) | claims 166,691                  
Short-duration Insurance Contracts, Accident Year 2023 [Member] | Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,365 2,373                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 925 444                
IBNR Reserves Dec. 31, 2024 (Audited) $ 836                  
Cumulative Number of Reported Claims (Audited) | claims 97,620                  
Short-duration Insurance Contracts, Accident Year 2023 [Member] | Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 888 862                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 274 90                
IBNR Reserves Dec. 31, 2024 (Audited) $ 422                  
Cumulative Number of Reported Claims (Audited) | claims 5,730                  
Short-duration Insurance Contracts, Accident Year 2023 [Member] | Bond & Specialty Insurance [Member] | Fidelity and surety [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 374 353                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 202 96                
IBNR Reserves Dec. 31, 2024 (Audited) $ 104                  
Cumulative Number of Reported Claims (Audited) | claims 948                  
Short-duration Insurance Contracts, Accident Year 2023 [Member] | Personal Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 5,133 5,206                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 4,068 2,888                
IBNR Reserves Dec. 31, 2024 (Audited) $ 593                  
Cumulative Number of Reported Claims (Audited) | claims 1,109,494                  
Short-duration Insurance Contracts, Accident Year 2023 [Member] | Personal Insurance [Member] | Homeowners (excluding Other) [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 5,018 5,171                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 4,608 3,369                
IBNR Reserves Dec. 31, 2024 (Audited) $ 214                  
Cumulative Number of Reported Claims (Audited) | claims 267,031                  
Short-duration Insurance Contracts, Accident Year 2023 [Member] | Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 434 410                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 262 $ 184                
IBNR Reserves Dec. 31, 2024 (Audited) $ 74                  
Cumulative Number of Reported Claims (Audited) | claims 32,737                  
Short-duration Insurance Contracts, Accident Year 2024 [Member] | Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,340                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 55                  
IBNR Reserves Dec. 31, 2024 (Audited) $ 2,120                  
Cumulative Number of Reported Claims (Audited) | claims 12,629                  
Short-duration Insurance Contracts, Accident Year 2024 [Member] | Business Insurance [Member] | Commercial property [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 1,474                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 702                  
IBNR Reserves Dec. 31, 2024 (Audited) $ 201                  
Cumulative Number of Reported Claims (Audited) | claims 25,257                  
Short-duration Insurance Contracts, Accident Year 2024 [Member] | Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,946                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 906                  
IBNR Reserves Dec. 31, 2024 (Audited) $ 1,255                  
Cumulative Number of Reported Claims (Audited) | claims 42,267                  
Short-duration Insurance Contracts, Accident Year 2024 [Member] | Business Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,544                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 604                  
IBNR Reserves Dec. 31, 2024 (Audited) $ 1,493                  
Cumulative Number of Reported Claims (Audited) | claims 150,376                  
Short-duration Insurance Contracts, Accident Year 2024 [Member] | Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 2,352                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 443                  
IBNR Reserves Dec. 31, 2024 (Audited) $ 1,363                  
Cumulative Number of Reported Claims (Audited) | claims 86,556                  
Short-duration Insurance Contracts, Accident Year 2024 [Member] | Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 1,001                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 115                  
IBNR Reserves Dec. 31, 2024 (Audited) $ 716                  
Cumulative Number of Reported Claims (Audited) | claims 4,772                  
Short-duration Insurance Contracts, Accident Year 2024 [Member] | Bond & Specialty Insurance [Member] | Fidelity and surety [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 363                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 39                  
IBNR Reserves Dec. 31, 2024 (Audited) $ 311                  
Cumulative Number of Reported Claims (Audited) | claims 783                  
Short-duration Insurance Contracts, Accident Year 2024 [Member] | Personal Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 5,179                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 2,838                  
IBNR Reserves Dec. 31, 2024 (Audited) $ 1,561                  
Cumulative Number of Reported Claims (Audited) | claims 945,540                  
Short-duration Insurance Contracts, Accident Year 2024 [Member] | Personal Insurance [Member] | Homeowners (excluding Other) [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 5,021                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 3,402                  
IBNR Reserves Dec. 31, 2024 (Audited) $ 1,129                  
Cumulative Number of Reported Claims (Audited) | claims 212,797                  
Short-duration Insurance Contracts, Accident Year 2024 [Member] | Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) $ 462                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2024) 188                  
IBNR Reserves Dec. 31, 2024 (Audited) $ 128                  
Cumulative Number of Reported Claims (Audited) | claims 31,642