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Insurance Claim Reserves (Details) - Claim Development
$ in Millions
Dec. 31, 2021
USD ($)
claims
Dec. 31, 2020
USD ($)
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 ($)
Dec. 31, 2012
USD ($)
Claims Development                    
Total net liability (Audited) $ 49,779                  
Property-casualty [Member]                    
Claims Development                    
Total net liability (Audited) 49,779                  
Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 12,323                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 6,481                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 5,842                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 3,051                  
Total net liability (Audited) 8,893                  
Business Insurance [Member] | Commercial property [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 5,477                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 4,611                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 866                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 131                  
Total net liability (Audited) 997                  
Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 18,678                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 14,538                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 4,140                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 287                  
Total net liability (Audited) 4,427                  
Business Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 8,688                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 5,183                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 3,505                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 235                  
Total net liability (Audited) 3,740                  
Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 24,062                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 13,345                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 10,717                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 5,906                  
Total net liability (Audited) 16,623                  
Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 5,890                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 3,626                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 2,264                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 33                  
Total net liability (Audited) 2,297                  
Bond & Specialty Insurance [Member] | Fidelity and surety [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 1,133                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 667                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 466                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 61                  
Total net liability (Audited) 527                  
Personal Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 16,232                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 13,307                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 2,925                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 230                  
Total net liability (Audited) 3,155                  
Personal Insurance [Member] | Homeowners (excluding Other) [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 13,258                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 11,618                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 1,640                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 21                  
Total net liability (Audited) 1,661                  
Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 4,092                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 3,368                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 724                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 21                  
Total net liability (Audited) 745                  
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 927 $ 941 $ 920 $ 917 $ 905 $ 892 $ 913 $ 935 $ 985 $ 989
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 837 831 811 754 699 589 489 295 150 32
IBNR Reserves Dec. 31, 2021 (Audited) $ 59                  
Cumulative Number of Reported Claims (Audited) | claims 25,061                  
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) $ 1,851 1,853 1,854 1,859 1,867 1,888 1,888 1,903 1,883 1,885
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 1,818 1,811 1,804 1,780 1,752 1,699 1,590 1,424 1,246 795
IBNR Reserves Dec. 31, 2021 (Audited) $ 21                  
Cumulative Number of Reported Claims (Audited) | claims 105,054                  
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) $ 2,375 2,377 2,387 2,416 2,453 2,445 2,456 2,457 2,456 2,447
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 1,793 1,768 1,735 1,689 1,629 1,536 1,394 1,217 940 443
IBNR Reserves Dec. 31, 2021 (Audited) $ 347                  
Cumulative Number of Reported Claims (Audited) | claims 138,454                  
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) $ 605 581 593 605 599 601 605 614 591 538
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 493 459 453 436 419 383 342 255 160 38
IBNR Reserves Dec. 31, 2021 (Audited) $ 14                  
Cumulative Number of Reported Claims (Audited) | claims 4,872                  
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) $ 372 372 371 383 390 407 408 425 423 446
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 365 362 356 351 342 324 295 268 237 $ 170
IBNR Reserves Dec. 31, 2021 (Audited) $ 0                  
Cumulative Number of Reported Claims (Audited) | claims 51,245                  
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 2021) $ 963 975 975 933 927 940 958 975 965  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 853 836 816 745 639 498 363 175 35  
IBNR Reserves Dec. 31, 2021 (Audited) $ 72                  
Cumulative Number of Reported Claims (Audited) | claims 22,775                  
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 2021) $ 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 2021) 1,544 1,532 1,516 1,475 1,410 1,304 1,167 987 644  
IBNR Reserves Dec. 31, 2021 (Audited) $ 26                  
Cumulative Number of Reported Claims (Audited) | claims 83,991                  
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 2021) $ 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 2021) 1,729 1,700 1,659 1,604 1,525 1,413 1,237 954 458  
IBNR Reserves Dec. 31, 2021 (Audited) $ 344                  
Cumulative Number of Reported Claims (Audited) | claims 134,573                  
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 2021) $ 564 575 586 607 654 630 606 565 510  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 482 462 451 434 400 352 252 154 34  
IBNR Reserves Dec. 31, 2021 (Audited) $ (4)                  
Cumulative Number of Reported Claims (Audited) | claims 4,467                  
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 2021) $ 436 439 444 454 456 469 481 490 497  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 430 423 415 397 378 345 311 278 $ 199  
IBNR Reserves Dec. 31, 2021 (Audited) $ (7)                  
Cumulative Number of Reported Claims (Audited) | claims 54,268                  
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 2021) $ 979 988 1,013 956 948 983 989 976    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 832 805 750 640 515 321 163 37    
IBNR Reserves Dec. 31, 2021 (Audited) $ 100                  
Cumulative Number of Reported Claims (Audited) | claims 22,576                  
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 2021) $ 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 2021) 1,560 1,544 1,512 1,448 1,328 1,154 956 628    
IBNR Reserves Dec. 31, 2021 (Audited) $ 32                  
Cumulative Number of Reported Claims (Audited) | claims 78,465                  
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 2021) $ 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 2021) 1,672 1,634 1,581 1,505 1,399 1,224 944 455    
IBNR Reserves Dec. 31, 2021 (Audited) $ 393                  
Cumulative Number of Reported Claims (Audited) | claims 131,465                  
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 2021) $ 449 450 452 473 518 563 571 549    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 426 418 407 367 312 239 150 38    
IBNR Reserves Dec. 31, 2021 (Audited) $ 15                  
Cumulative Number of Reported Claims (Audited) | claims 4,375                  
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 2021) $ 430 433 434 437 444 456 456 440    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 426 411 394 371 339 309 272 $ 194    
IBNR Reserves Dec. 31, 2021 (Audited) $ (10)                  
Cumulative Number of Reported Claims (Audited) | claims 52,300                  
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 2021) $ 1,072 1,087 1,057 967 923 956 998      
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 875 828 740 558 336 137 36      
IBNR Reserves Dec. 31, 2021 (Audited) $ 113                  
Cumulative Number of Reported Claims (Audited) | claims 21,689                  
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 2021) $ 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 2021) 1,489 1,452 1,409 1,310 1,144 970 595      
IBNR Reserves Dec. 31, 2021 (Audited) $ 46                  
Cumulative Number of Reported Claims (Audited) | claims 71,922                  
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 2021) $ 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 2021) 1,520 1,470 1,411 1,310 1,154 893 430      
IBNR Reserves Dec. 31, 2021 (Audited) $ 462                  
Cumulative Number of Reported Claims (Audited) | claims 130,920                  
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 2021) $ 413 414 395 437 486 524 528      
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 381 348 338 310 234 141 38      
IBNR Reserves Dec. 31, 2021 (Audited) $ 21                  
Cumulative Number of Reported Claims (Audited) | claims 4,226                  
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 2021) $ 361 366 367 366 369 369 370      
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 344 330 315 290 260 232 $ 166      
IBNR Reserves Dec. 31, 2021 (Audited) $ (2)                  
Cumulative Number of Reported Claims (Audited) | claims 45,220                  
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 2021) $ 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 2021) 858 758 649 421 191 35        
IBNR Reserves Dec. 31, 2021 (Audited) $ 189                  
Cumulative Number of Reported Claims (Audited) | claims 20,556                  
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 2021) $ 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 2021) 1,437 1,373 1,278 1,133 950 585        
IBNR Reserves Dec. 31, 2021 (Audited) $ 63                  
Cumulative Number of Reported Claims (Audited) | claims 69,368                  
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 2021) $ 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 2021) 1,433 1,367 1,272 1,118 873 421        
IBNR Reserves Dec. 31, 2021 (Audited) $ 456                  
Cumulative Number of Reported Claims (Audited) | claims 130,036                  
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 2021) $ 510 514 520 504 511 512        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 446 378 313 233 141 30        
IBNR Reserves Dec. 31, 2021 (Audited) $ 34                  
Cumulative Number of Reported Claims (Audited) | claims 4,398                  
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 2021) $ 428 429 429 420 419 370        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 395 377 352 317 291 $ 217        
IBNR Reserves Dec. 31, 2021 (Audited) $ 2                  
Cumulative Number of Reported Claims (Audited) | claims 45,764                  
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 2021) $ 1,226 1,234 1,196 1,143 1,133          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 724 552 378 180 40          
IBNR Reserves Dec. 31, 2021 (Audited) $ 266                  
Cumulative Number of Reported Claims (Audited) | claims 19,262                  
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Business Insurance [Member] | Commercial property [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) $ 1,117 1,128 1,151 1,177 1,209          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 1,103 1,094 1,073 1,003 618          
IBNR Reserves Dec. 31, 2021 (Audited) $ 3                  
Cumulative Number of Reported Claims (Audited) | claims 25,143                  
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 2021) $ 1,935 1,919 1,956 1,928 1,872          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 1,674 1,531 1,388 1,199 716          
IBNR Reserves Dec. 31, 2021 (Audited) $ 104                  
Cumulative Number of Reported Claims (Audited) | claims 72,318                  
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Business Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) $ 1,533 1,522 1,524 1,501 1,386          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 1,361 1,226 1,027 746 456          
IBNR Reserves Dec. 31, 2021 (Audited) $ 53                  
Cumulative Number of Reported Claims (Audited) | claims 192,155                  
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 2021) $ 2,439 2,483 2,584 2,681 2,779          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 1,418 1,314 1,154 890 433          
IBNR Reserves Dec. 31, 2021 (Audited) $ 638                  
Cumulative Number of Reported Claims (Audited) | claims 122,110                  
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 2021) $ 524 493 526 517 534          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 404 340 262 155 38          
IBNR Reserves Dec. 31, 2021 (Audited) $ 65                  
Cumulative Number of Reported Claims (Audited) | claims 4,585                  
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Bond & Specialty Insurance [Member] | Fidelity and surety [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) $ 226 241 240 271 244          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 210 205 194 166 70          
IBNR Reserves Dec. 31, 2021 (Audited) $ 1                  
Cumulative Number of Reported Claims (Audited) | claims 940                  
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Personal Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) $ 3,199 3,206 3,221 3,256 3,323          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 3,121 3,046 2,887 2,575 1,912          
IBNR Reserves Dec. 31, 2021 (Audited) $ 24                  
Cumulative Number of Reported Claims (Audited) | claims 1,062,811                  
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Personal Insurance [Member] | Homeowners (excluding Other) [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) $ 2,160 2,170 2,343 2,340 2,312          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 2,103 2,089 2,197 2,059 1,471          
IBNR Reserves Dec. 31, 2021 (Audited) $ 14                  
Cumulative Number of Reported Claims (Audited) | claims 170,198                  
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 2021) $ 413 414 414 391 355          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 356 328 304 263 $ 187          
IBNR Reserves Dec. 31, 2021 (Audited) $ 5                  
Cumulative Number of Reported Claims (Audited) | claims 46,825                  
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 2021) $ 1,395 1,344 1,312 1,253            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 709 441 202 42            
IBNR Reserves Dec. 31, 2021 (Audited) $ 407                  
Cumulative Number of Reported Claims (Audited) | claims 19,135                  
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 2021) $ 1,068 1,070 1,079 1,093            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 1,005 981 928 561            
IBNR Reserves Dec. 31, 2021 (Audited) $ 20                  
Cumulative Number of Reported Claims (Audited) | claims 25,077                  
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 2021) $ 2,112 2,092 2,114 1,976            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 1,669 1,500 1,302 792            
IBNR Reserves Dec. 31, 2021 (Audited) $ 163                  
Cumulative Number of Reported Claims (Audited) | claims 72,853                  
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 2021) $ 1,761 1,745 1,742 1,645            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 1,404 1,159 848 515            
IBNR Reserves Dec. 31, 2021 (Audited) $ 130                  
Cumulative Number of Reported Claims (Audited) | claims 204,588                  
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 2021) $ 2,503 2,599 2,687 2,744            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 1,330 1,169 919 440            
IBNR Reserves Dec. 31, 2021 (Audited) $ 737                  
Cumulative Number of Reported Claims (Audited) | claims 122,931                  
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 2021) $ 595 585 548 530            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 383 290 182 49            
IBNR Reserves Dec. 31, 2021 (Audited) $ 99                  
Cumulative Number of Reported Claims (Audited) | claims 4,795                  
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 2021) $ 220 220 235 220            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 206 202 171 64            
IBNR Reserves Dec. 31, 2021 (Audited) $ 2                  
Cumulative Number of Reported Claims (Audited) | claims 907                  
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 2021) $ 3,220 3,233 3,269 3,281            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 3,040 2,880 2,582 1,889            
IBNR Reserves Dec. 31, 2021 (Audited) $ 60                  
Cumulative Number of Reported Claims (Audited) | claims 1,051,415                  
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 2021) $ 2,325 2,381 2,574 2,610            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 2,239 2,255 2,298 1,657            
IBNR Reserves Dec. 31, 2021 (Audited) $ 21                  
Cumulative Number of Reported Claims (Audited) | claims 187,306                  
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 2021) $ 480 475 474 451            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 389 349 312 $ 224            
IBNR Reserves Dec. 31, 2021 (Audited) $ 17                  
Cumulative Number of Reported Claims (Audited) | claims 50,599                  
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 2021) $ 1,498 1,486 1,447              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 482 233 51              
IBNR Reserves Dec. 31, 2021 (Audited) $ 682                  
Cumulative Number of Reported Claims (Audited) | claims 17,717                  
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 2021) $ 1,031 1,034 1,069              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 1,001 957 610              
IBNR Reserves Dec. 31, 2021 (Audited) $ (12)                  
Cumulative Number of Reported Claims (Audited) | claims 25,376                  
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 2021) $ 2,089 2,087 2,017              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 1,423 1,187 707              
IBNR Reserves Dec. 31, 2021 (Audited) $ 294                  
Cumulative Number of Reported Claims (Audited) | claims 66,484                  
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 2021) $ 1,976 1,951 1,835              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 1,269 934 539              
IBNR Reserves Dec. 31, 2021 (Audited) $ 321                  
Cumulative Number of Reported Claims (Audited) | claims 206,533                  
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 2021) $ 2,699 2,714 2,680              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 1,229 951 466              
IBNR Reserves Dec. 31, 2021 (Audited) $ 844                  
Cumulative Number of Reported Claims (Audited) | claims 119,678                  
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 2021) $ 665 653 588              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 323 189 51              
IBNR Reserves Dec. 31, 2021 (Audited) $ 214                  
Cumulative Number of Reported Claims (Audited) | claims 5,290                  
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 2021) $ 200 193 203              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 147 121 49              
IBNR Reserves Dec. 31, 2021 (Audited) $ 37                  
Cumulative Number of Reported Claims (Audited) | claims 871                  
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 2021) $ 3,333 3,361 3,362              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 2,958 2,650 1,933              
IBNR Reserves Dec. 31, 2021 (Audited) $ 153                  
Cumulative Number of Reported Claims (Audited) | claims 1,032,740                  
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 2021) $ 2,343 2,344 2,297              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 2,269 2,179 1,613              
IBNR Reserves Dec. 31, 2021 (Audited) $ 26                  
Cumulative Number of Reported Claims (Audited) | claims 181,209                  
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 2021) $ 473 451 456              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 333 296 $ 221              
IBNR Reserves Dec. 31, 2021 (Audited) $ 53                  
Cumulative Number of Reported Claims (Audited) | claims 48,179                  
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 2021) $ 1,493 1,467                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 244 61                
IBNR Reserves Dec. 31, 2021 (Audited) $ 1,013                  
Cumulative Number of Reported Claims (Audited) | claims 12,141                  
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 2021) $ 1,025 1,107                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 857 580                
IBNR Reserves Dec. 31, 2021 (Audited) $ 38                  
Cumulative Number of Reported Claims (Audited) | claims 25,434                  
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 2021) $ 2,141 2,142                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 1,180 791                
IBNR Reserves Dec. 31, 2021 (Audited) $ 575                  
Cumulative Number of Reported Claims (Audited) | claims 67,796                  
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 2021) $ 1,677 1,788                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 696 437                
IBNR Reserves Dec. 31, 2021 (Audited) $ 640                  
Cumulative Number of Reported Claims (Audited) | claims 141,722                  
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 2021) $ 2,530 2,559                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 794 389                
IBNR Reserves Dec. 31, 2021 (Audited) $ 1,249                  
Cumulative Number of Reported Claims (Audited) | claims 95,611                  
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 2021) $ 753 772                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 210 52                
IBNR Reserves Dec. 31, 2021 (Audited) $ 399                  
Cumulative Number of Reported Claims (Audited) | claims 5,004                  
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 2021) $ 203 274                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 79 50                
IBNR Reserves Dec. 31, 2021 (Audited) $ 93                  
Cumulative Number of Reported Claims (Audited) | claims 754                  
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 2021) $ 2,764 2,829                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 2,126 1,571                
IBNR Reserves Dec. 31, 2021 (Audited) $ 353                  
Cumulative Number of Reported Claims (Audited) | claims 808,338                  
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 2021) $ 2,967 3,019                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 2,673 2,019                
IBNR Reserves Dec. 31, 2021 (Audited) $ 170                  
Cumulative Number of Reported Claims (Audited) | claims 219,786                  
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 2021) $ 342 356                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 199 $ 148                
IBNR Reserves Dec. 31, 2021 (Audited) $ 88                  
Cumulative Number of Reported Claims (Audited) | claims 30,098                  
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 2021) $ 1,591                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 67                  
IBNR Reserves Dec. 31, 2021 (Audited) $ 1,365                  
Cumulative Number of Reported Claims (Audited) | claims 9,119                  
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 2021) $ 1,236                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 645                  
IBNR Reserves Dec. 31, 2021 (Audited) $ 94                  
Cumulative Number of Reported Claims (Audited) | claims 21,996                  
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 2021) $ 2,164                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 744                  
IBNR Reserves Dec. 31, 2021 (Audited) $ 892                  
Cumulative Number of Reported Claims (Audited) | claims 47,190                  
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 2021) $ 1,741                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 453                  
IBNR Reserves Dec. 31, 2021 (Audited) $ 941                  
Cumulative Number of Reported Claims (Audited) | claims 132,893                  
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 2021) $ 2,356                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 427                  
IBNR Reserves Dec. 31, 2021 (Audited) $ 1,420                  
Cumulative Number of Reported Claims (Audited) | claims 83,546                  
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 2021) $ 812                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 78                  
IBNR Reserves Dec. 31, 2021 (Audited) $ 613                  
Cumulative Number of Reported Claims (Audited) | claims 3,847                  
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 2021) $ 284                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 25                  
IBNR Reserves Dec. 31, 2021 (Audited) $ 253                  
Cumulative Number of Reported Claims (Audited) | claims 421                  
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 2021) $ 3,716                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 2,062                  
IBNR Reserves Dec. 31, 2021 (Audited) $ 1,028                  
Cumulative Number of Reported Claims (Audited) | claims 894,499                  
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 2021) $ 3,463                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 2,334                  
IBNR Reserves Dec. 31, 2021 (Audited) $ 774                  
Cumulative Number of Reported Claims (Audited) | claims 203,280                  
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 2021) $ 357                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2021) 131                  
IBNR Reserves Dec. 31, 2021 (Audited) $ 136                  
Cumulative Number of Reported Claims (Audited) | claims 26,606