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Insurance Claim Reserves (Details) - Claim Development
$ in Millions
Dec. 31, 2022
USD ($)
claims
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Claims Development                    
Total net liability (Audited) $ 51,926                  
Property-casualty [Member]                    
Claims Development                    
Total net liability (Audited) 51,926                  
Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 13,243                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 7,034                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 6,209                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 3,060                  
Total net liability (Audited) 9,269                  
Business Insurance [Member] | Commercial property [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 5,594                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 4,620                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 974                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 135                  
Total net liability (Audited) 1,109                  
Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 19,252                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 14,724                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 4,528                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 291                  
Total net liability (Audited) 4,819                  
Business Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 9,090                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 5,469                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 3,621                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 235                  
Total net liability (Audited) 3,856                  
Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 23,405                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 13,077                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 10,328                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 6,145                  
Total net liability (Audited) 16,473                  
Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 6,066                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 3,758                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 2,308                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 80                  
Total net liability (Audited) 2,388                  
Bond & Specialty Insurance [Member] | Fidelity and surety [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 1,102                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 564                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 538                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 26                  
Total net liability (Audited) 564                  
Personal Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 17,816                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 14,378                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 3,438                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 216                  
Total net liability (Audited) 3,654                  
Personal Insurance [Member] | Homeowners (excluding Other) [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 15,334                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 13,080                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 2,254                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 73                  
Total net liability (Audited) 2,327                  
Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 3,841                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 3,158                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 683                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 25                  
Total net liability (Audited) 708                  
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 963 $ 963 $ 975 $ 975 $ 933 $ 927 $ 940 $ 958 $ 975 $ 965
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 868 853 836 816 745 639 498 363 175 35
IBNR Reserves Dec. 31, 2022 (Audited) $ 67                  
Cumulative Number of Reported Claims (Audited) | claims 22,807                  
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 1,591 1,593 1,598 1,599 1,600 1,591 1,609 1,620 1,623 1,615
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 1,556 1,544 1,532 1,516 1,475 1,410 1,304 1,167 987 644
IBNR Reserves Dec. 31, 2022 (Audited) $ 19                  
Cumulative Number of Reported Claims (Audited) | claims 84,057                  
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 2,273 2,304 2,321 2,354 2,423 2,463 2,506 2,540 2,545 2,553
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 1,756 1,729 1,700 1,659 1,604 1,525 1,413 1,237 954 458
IBNR Reserves Dec. 31, 2022 (Audited) $ 309                  
Cumulative Number of Reported Claims (Audited) | claims 135,317                  
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 561 564 575 586 607 654 630 606 565 510
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 551 482 462 451 434 400 352 252 154 34
IBNR Reserves Dec. 31, 2022 (Audited) $ (8)                  
Cumulative Number of Reported Claims (Audited) | claims 4,471                  
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 410 407 410 414 424 425 438 449 458 464
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 403 402 395 387 371 353 322 291 260 $ 186
IBNR Reserves Dec. 31, 2022 (Audited) $ (4)                  
Cumulative Number of Reported Claims (Audited) | claims 54,237                  
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 971 979 988 1,013 956 948 983 989 976  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 849 832 805 750 640 515 321 163 37  
IBNR Reserves Dec. 31, 2022 (Audited) $ 86                  
Cumulative Number of Reported Claims (Audited) | claims 22,619                  
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 1,619 1,622 1,627 1,627 1,626 1,617 1,625 1,627 1,663  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 1,577 1,560 1,544 1,512 1,448 1,328 1,154 956 628  
IBNR Reserves Dec. 31, 2022 (Audited) $ 23                  
Cumulative Number of Reported Claims (Audited) | claims 78,513                  
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 2,277 2,336 2,352 2,393 2,430 2,476 2,547 2,553 2,554  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 1,703 1,672 1,634 1,581 1,505 1,399 1,224 944 455  
IBNR Reserves Dec. 31, 2022 (Audited) $ 352                  
Cumulative Number of Reported Claims (Audited) | claims 131,630                  
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 451 449 450 452 473 518 563 571 549  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 431 426 418 407 367 312 239 150 38  
IBNR Reserves Dec. 31, 2022 (Audited) $ 14                  
Cumulative Number of Reported Claims (Audited) | claims 4,379                  
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 410 402 405 405 408 415 426 425 410  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 401 398 383 368 347 317 289 254 $ 181  
IBNR Reserves Dec. 31, 2022 (Audited) $ (3)                  
Cumulative Number of Reported Claims (Audited) | claims 52,294                  
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 2022) $ 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 2022) 927 875 828 740 558 336 137 36    
IBNR Reserves Dec. 31, 2022 (Audited) $ 78                  
Cumulative Number of Reported Claims (Audited) | claims 21,778                  
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 2022) $ 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 2022) 1,512 1,489 1,452 1,409 1,310 1,144 970 595    
IBNR Reserves Dec. 31, 2022 (Audited) $ 32                  
Cumulative Number of Reported Claims (Audited) | claims 72,237                  
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 2022) $ 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 2022) 1,547 1,520 1,470 1,411 1,310 1,154 893 430    
IBNR Reserves Dec. 31, 2022 (Audited) $ 398                  
Cumulative Number of Reported Claims (Audited) | claims 131,175                  
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 2022) $ 414 413 414 395 437 486 524 528    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 383 381 348 338 310 234 141 38    
IBNR Reserves Dec. 31, 2022 (Audited) $ 23                  
Cumulative Number of Reported Claims (Audited) | claims 4,229                  
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 2022) $ 337 337 342 343 341 345 345 345    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 328 321 308 294 270 243 216 $ 155    
IBNR Reserves Dec. 31, 2022 (Audited) $ (4)                  
Cumulative Number of Reported Claims (Audited) | claims 45,217                  
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 2022) $ 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 2022) 951 858 758 649 421 191 35      
IBNR Reserves Dec. 31, 2022 (Audited) $ 143                  
Cumulative Number of Reported Claims (Audited) | claims 20,662                  
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 2022) $ 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 2022) 1,477 1,437 1,373 1,278 1,133 950 585      
IBNR Reserves Dec. 31, 2022 (Audited) $ 42                  
Cumulative Number of Reported Claims (Audited) | claims 69,487                  
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 2022) $ 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 2022) 1,486 1,433 1,367 1,272 1,118 873 421      
IBNR Reserves Dec. 31, 2022 (Audited) $ 379                  
Cumulative Number of Reported Claims (Audited) | claims 131,848                  
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 2022) $ 511 510 514 520 504 511 512      
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 463 446 378 313 233 141 30      
IBNR Reserves Dec. 31, 2022 (Audited) $ 19                  
Cumulative Number of Reported Claims (Audited) | claims 4,407                  
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 2022) $ 401 400 401 401 392 392 346      
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 381 369 352 329 296 271 $ 202      
IBNR Reserves Dec. 31, 2022 (Audited) $ (3)                  
Cumulative Number of Reported Claims (Audited) | claims 45,765                  
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 2022) $ 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 2022) 914 724 552 378 180 40        
IBNR Reserves Dec. 31, 2022 (Audited) $ 171                  
Cumulative Number of Reported Claims (Audited) | claims 19,450                  
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 2022) $ 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 2022) 1,763 1,674 1,531 1,388 1,199 716        
IBNR Reserves Dec. 31, 2022 (Audited) $ 80                  
Cumulative Number of Reported Claims (Audited) | claims 72,491                  
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 2022) $ 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 2022) 1,490 1,418 1,314 1,154 890 433        
IBNR Reserves Dec. 31, 2022 (Audited) $ 501                  
Cumulative Number of Reported Claims (Audited) | claims 125,747                  
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 2022) $ 554 524 493 526 517 534        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 450 404 340 262 155 38        
IBNR Reserves Dec. 31, 2022 (Audited) $ 49                  
Cumulative Number of Reported Claims (Audited) | claims 4,606                  
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 2022) $ 389 386 386 386 365 331        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 352 332 307 284 246 $ 174        
IBNR Reserves Dec. 31, 2022 (Audited) $ (4)                  
Cumulative Number of Reported Claims (Audited) | claims 46,822                  
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 2022) $ 1,477 1,395 1,344 1,312 1,253          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 939 709 441 202 42          
IBNR Reserves Dec. 31, 2022 (Audited) $ 294                  
Cumulative Number of Reported Claims (Audited) | claims 19,508                  
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Business Insurance [Member] | Commercial property [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 1,051 1,068 1,070 1,079 1,093          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 1,009 1,005 981 928 561          
IBNR Reserves Dec. 31, 2022 (Audited) $ 14                  
Cumulative Number of Reported Claims (Audited) | claims 25,094                  
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 2022) $ 2,121 2,112 2,092 2,114 1,976          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 1,815 1,669 1,500 1,302 792          
IBNR Reserves Dec. 31, 2022 (Audited) $ 108                  
Cumulative Number of Reported Claims (Audited) | claims 76,526                  
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Business Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 1,781 1,761 1,745 1,742 1,645          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 1,594 1,404 1,159 848 515          
IBNR Reserves Dec. 31, 2022 (Audited) $ 63                  
Cumulative Number of Reported Claims (Audited) | claims 204,942                  
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 2022) $ 2,416 2,503 2,599 2,687 2,744          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 1,440 1,330 1,169 919 440          
IBNR Reserves Dec. 31, 2022 (Audited) $ 625                  
Cumulative Number of Reported Claims (Audited) | claims 123,572                  
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 2022) $ 605 595 585 548 530          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 458 383 290 182 49          
IBNR Reserves Dec. 31, 2022 (Audited) $ 49                  
Cumulative Number of Reported Claims (Audited) | claims 4,850                  
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Bond & Specialty Insurance [Member] | Fidelity and surety [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 216 220 220 235 220          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 214 206 202 171 64          
IBNR Reserves Dec. 31, 2022 (Audited) $ (7)                  
Cumulative Number of Reported Claims (Audited) | claims 914                  
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Personal Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 3,223 3,220 3,233 3,269 3,281          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 3,144 3,040 2,880 2,582 1,889          
IBNR Reserves Dec. 31, 2022 (Audited) $ 22                  
Cumulative Number of Reported Claims (Audited) | claims 1,051,593                  
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Personal Insurance [Member] | Homeowners (excluding Other) [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 2,321 2,325 2,381 2,574 2,610          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 2,253 2,239 2,255 2,298 1,657          
IBNR Reserves Dec. 31, 2022 (Audited) $ 24                  
Cumulative Number of Reported Claims (Audited) | claims 187,375                  
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 2022) $ 451 448 444 442 421          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 394 363 326 292 $ 210          
IBNR Reserves Dec. 31, 2022 (Audited) $ 7                  
Cumulative Number of Reported Claims (Audited) | claims 50,601                  
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 2022) $ 1,567 1,498 1,486 1,447            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 816 482 233 51            
IBNR Reserves Dec. 31, 2022 (Audited) $ 452                  
Cumulative Number of Reported Claims (Audited) | claims 18,691                  
Short-duration Insurance Contracts, Accident Year 2019 [Member] | Business Insurance [Member] | Commercial property [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 1,039 1,031 1,034 1,069            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 1,012 1,001 957 610            
IBNR Reserves Dec. 31, 2022 (Audited) $ 3                  
Cumulative Number of Reported Claims (Audited) | claims 25,427                  
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 2022) $ 2,103 2,089 2,087 2,017            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 1,628 1,423 1,187 707            
IBNR Reserves Dec. 31, 2022 (Audited) $ 182                  
Cumulative Number of Reported Claims (Audited) | claims 67,315                  
Short-duration Insurance Contracts, Accident Year 2019 [Member] | Business Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 1,992 1,976 1,951 1,835            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 1,577 1,269 934 539            
IBNR Reserves Dec. 31, 2022 (Audited) $ 149                  
Cumulative Number of Reported Claims (Audited) | claims 207,185                  
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 2022) $ 2,632 2,699 2,714 2,680            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 1,402 1,229 951 466            
IBNR Reserves Dec. 31, 2022 (Audited) $ 724                  
Cumulative Number of Reported Claims (Audited) | claims 120,190                  
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 2022) $ 670 665 653 588            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 410 323 189 51            
IBNR Reserves Dec. 31, 2022 (Audited) $ 146                  
Cumulative Number of Reported Claims (Audited) | claims 5,408                  
Short-duration Insurance Contracts, Accident Year 2019 [Member] | Bond & Specialty Insurance [Member] | Fidelity and surety [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 185 200 193 203            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 154 147 121 49            
IBNR Reserves Dec. 31, 2022 (Audited) $ 18                  
Cumulative Number of Reported Claims (Audited) | claims 888                  
Short-duration Insurance Contracts, Accident Year 2019 [Member] | Personal Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 3,339 3,333 3,361 3,362            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 3,159 2,958 2,650 1,933            
IBNR Reserves Dec. 31, 2022 (Audited) $ 64                  
Cumulative Number of Reported Claims (Audited) | claims 1,033,458                  
Short-duration Insurance Contracts, Accident Year 2019 [Member] | Personal Insurance [Member] | Homeowners (excluding Other) [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) $ 2,341 2,343 2,344 2,297            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 2,300 2,269 2,179 1,613            
IBNR Reserves Dec. 31, 2022 (Audited) $ 12                  
Cumulative Number of Reported Claims (Audited) | claims 181,434                  
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 2022) $ 444 441 421 426            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 348 311 277 $ 207            
IBNR Reserves Dec. 31, 2022 (Audited) $ 22                  
Cumulative Number of Reported Claims (Audited) | claims 48,212                  
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 2022) $ 1,470 1,493 1,467              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 458 244 61              
IBNR Reserves Dec. 31, 2022 (Audited) $ 719                  
Cumulative Number of Reported Claims (Audited) | claims 13,622                  
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 2022) $ 1,005 1,025 1,107              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 907 857 580              
IBNR Reserves Dec. 31, 2022 (Audited) $ 38                  
Cumulative Number of Reported Claims (Audited) | claims 25,638                  
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 2022) $ 2,126 2,141 2,142              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 1,373 1,180 791              
IBNR Reserves Dec. 31, 2022 (Audited) $ 424                  
Cumulative Number of Reported Claims (Audited) | claims 69,470                  
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 2022) $ 1,621 1,677 1,788              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 958 696 437              
IBNR Reserves Dec. 31, 2022 (Audited) $ 364                  
Cumulative Number of Reported Claims (Audited) | claims 142,649                  
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 2022) $ 2,433 2,530 2,559              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 1,017 794 389              
IBNR Reserves Dec. 31, 2022 (Audited) $ 908                  
Cumulative Number of Reported Claims (Audited) | claims 96,477                  
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 2022) $ 741 753 772              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 333 210 52              
IBNR Reserves Dec. 31, 2022 (Audited) $ 265                  
Cumulative Number of Reported Claims (Audited) | claims 5,329                  
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 2022) $ 219 203 274              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 110 79 50              
IBNR Reserves Dec. 31, 2022 (Audited) $ 95                  
Cumulative Number of Reported Claims (Audited) | claims 787                  
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 2022) $ 2,729 2,764 2,829              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 2,411 2,126 1,571              
IBNR Reserves Dec. 31, 2022 (Audited) $ 150                  
Cumulative Number of Reported Claims (Audited) | claims 810,317                  
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 2022) $ 2,909 2,967 3,019              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 2,755 2,673 2,019              
IBNR Reserves Dec. 31, 2022 (Audited) $ 68                  
Cumulative Number of Reported Claims (Audited) | claims 220,946                  
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 2022) $ 306 320 332              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 209 186 $ 138              
IBNR Reserves Dec. 31, 2022 (Audited) $ 46                  
Cumulative Number of Reported Claims (Audited) | claims 30,208                  
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 2022) $ 1,589 1,591                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 231 67                
IBNR Reserves Dec. 31, 2022 (Audited) $ 1,058                  
Cumulative Number of Reported Claims (Audited) | claims 12,974                  
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 2022) $ 1,190 1,236                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 1,068 645                
IBNR Reserves Dec. 31, 2022 (Audited) $ 2                  
Cumulative Number of Reported Claims (Audited) | claims 25,436                  
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 2022) $ 2,097 2,164                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 1,206 744                
IBNR Reserves Dec. 31, 2022 (Audited) $ 521                  
Cumulative Number of Reported Claims (Audited) | claims 55,421                  
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 2022) $ 1,757 1,741                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 800 453                
IBNR Reserves Dec. 31, 2022 (Audited) $ 561                  
Cumulative Number of Reported Claims (Audited) | claims 147,563                  
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 2022) $ 2,349 2,356                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 848 427                
IBNR Reserves Dec. 31, 2022 (Audited) $ 1,006                  
Cumulative Number of Reported Claims (Audited) | claims 94,430                  
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 2022) $ 756 812                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 210 78                
IBNR Reserves Dec. 31, 2022 (Audited) $ 404                  
Cumulative Number of Reported Claims (Audited) | claims 5,272                  
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 2022) $ 172 284                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 50 25                
IBNR Reserves Dec. 31, 2022 (Audited) $ 117                  
Cumulative Number of Reported Claims (Audited) | claims 576                  
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 2022) $ 3,770 3,716                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 2,981 2,062                
IBNR Reserves Dec. 31, 2022 (Audited) $ 426                  
Cumulative Number of Reported Claims (Audited) | claims 997,397                  
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 2022) $ 3,486 3,463                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 3,235 2,334                
IBNR Reserves Dec. 31, 2022 (Audited) $ 148                  
Cumulative Number of Reported Claims (Audited) | claims 231,949                  
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 2022) $ 322 334                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 180 $ 123                
IBNR Reserves Dec. 31, 2022 (Audited) $ 66                  
Cumulative Number of Reported Claims (Audited) | claims 28,114                  
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 2022) $ 1,696                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 81                  
IBNR Reserves Dec. 31, 2022 (Audited) $ 1,452                  
Cumulative Number of Reported Claims (Audited) | claims 11,568                  
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 2022) $ 1,309                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 624                  
IBNR Reserves Dec. 31, 2022 (Audited) $ 227                  
Cumulative Number of Reported Claims (Audited) | claims 23,549                  
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 2022) $ 2,502                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 817                  
IBNR Reserves Dec. 31, 2022 (Audited) $ 1,036                  
Cumulative Number of Reported Claims (Audited) | claims 42,299                  
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 2022) $ 1,939                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 540                  
IBNR Reserves Dec. 31, 2022 (Audited) $ 989                  
Cumulative Number of Reported Claims (Audited) | claims 141,652                  
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 2022) $ 2,293                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 388                  
IBNR Reserves Dec. 31, 2022 (Audited) $ 1,415                  
Cumulative Number of Reported Claims (Audited) | claims 92,937                  
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 2022) $ 803                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 69                  
IBNR Reserves Dec. 31, 2022 (Audited) $ 616                  
Cumulative Number of Reported Claims (Audited) | claims 3,462                  
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 2022) $ 310                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 36                  
IBNR Reserves Dec. 31, 2022 (Audited) $ 244                  
Cumulative Number of Reported Claims (Audited) | claims 526                  
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 2022) $ 4,755                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 2,683                  
IBNR Reserves Dec. 31, 2022 (Audited) $ 1,334                  
Cumulative Number of Reported Claims (Audited) | claims 1,015,497                  
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 2022) $ 4,277                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 2,537                  
IBNR Reserves Dec. 31, 2022 (Audited) $ 1,339                  
Cumulative Number of Reported Claims (Audited) | claims 191,981                  
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 2022) $ 371                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2022) 162                  
IBNR Reserves Dec. 31, 2022 (Audited) $ 104                  
Cumulative Number of Reported Claims (Audited) | claims 30,724