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Insurance Claim Reserves (Details) - Claim Development
$ in Millions
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Claims Development                    
Total net liability (Audited) $ 43,559                  
Property-casualty [Member]                    
Claims Development                    
Total net liability (Audited) 43,559                  
Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 9,850                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 5,640                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 4,210                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 2,949                  
Total net liability (Audited) 7,159                  
Business Insurance [Member] | Commercial property [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 4,655                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 3,825                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 830                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 143                  
Total net liability (Audited) 973                  
Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 17,837                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 14,659                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 3,178                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 357                  
Total net liability (Audited) 3,535                  
Business Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 6,993                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 4,339                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 2,654                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 207                  
Total net liability (Audited) 2,861                  
Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 23,783                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 13,020                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 10,763                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 5,276                  
Total net liability (Audited) 16,039                  
Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 5,464                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 3,702                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 1,762                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 71                  
Total net liability (Audited) 1,833                  
Bond & Specialty Insurance [Member] | Fidelity and surety [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 971                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 582                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 389                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 30                  
Total net liability (Audited) 419                  
Personal Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 13,511                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 10,975                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 2,536                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 240                  
Total net liability (Audited) 2,776                  
Personal Insurance [Member] | Homeowners (excluding Other) [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 9,378                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 8,025                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 1,353                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 23                  
Total net liability (Audited) 1,376                  
Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 3,982                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 3,306                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Disclosed Accident Years (Audited) 676                  
Liability for Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance, Before Disclosed Accident Years (Audited) 34                  
Total net liability (Audited) 710                  
Short-duration Insurance Contracts, Accident Year 2009 [Member] | Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 775 $ 783 $ 796 $ 809 $ 837 $ 869 $ 960 $ 1,028 $ 1,071 $ 1,060
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 701 689 667 643 613 543 446 314 167 35
IBNR Reserves Dec. 31, 2018 (Audited) $ 56                  
Cumulative Number of Reported Claims (Audited) | item 25,702                  
Short-duration Insurance Contracts, Accident Year 2009 [Member] | Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 1,493 1,500 1,509 1,514 1,514 1,511 1,498 1,501 1,506 1,484
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,466 1,457 1,449 1,436 1,408 1,360 1,264 1,121 958 603
IBNR Reserves Dec. 31, 2018 (Audited) $ 21                  
Cumulative Number of Reported Claims (Audited) | item 103,448                  
Short-duration Insurance Contracts, Accident Year 2009 [Member] | Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 1,728 1,736 1,750 1,775 1,766 1,753 1,753 1,746 1,778 1,799
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,303 1,274 1,235 1,193 1,137 1,065 961 828 623 288
IBNR Reserves Dec. 31, 2018 (Audited) $ 221                  
Cumulative Number of Reported Claims (Audited) | item 104,789                  
Short-duration Insurance Contracts, Accident Year 2009 [Member] | Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 626 631 641 655 660 680 686 665 624 592
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 597 595 592 563 497 460 390 310 167 36
IBNR Reserves Dec. 31, 2018 (Audited) $ 11                  
Cumulative Number of Reported Claims (Audited) | item 6,297                  
Short-duration Insurance Contracts, Accident Year 2009 [Member] | Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 440 442 449 449 456 464 456 450 442 454
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 434 433 430 419 403 379 350 323 283 $ 189
Cumulative Number of Reported Claims (Audited) | item 55,162                  
Short-duration Insurance Contracts, Accident Year 2010 [Member] | Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 911 908 918 912 927 959 1,021 1,031 1,028  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 800 781 756 702 629 487 324 139 35  
IBNR Reserves Dec. 31, 2018 (Audited) $ 79                  
Cumulative Number of Reported Claims (Audited) | item 27,911                  
Short-duration Insurance Contracts, Accident Year 2010 [Member] | Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 1,881 1,885 1,898 1,892 1,895 1,861 1,832 1,826 1,711  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,834 1,819 1,798 1,763 1,698 1,579 1,395 1,180 709  
IBNR Reserves Dec. 31, 2018 (Audited) $ 32                  
Cumulative Number of Reported Claims (Audited) | item 111,931                  
Short-duration Insurance Contracts, Accident Year 2010 [Member] | Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 2,003 2,021 2,055 2,052 2,049 2,056 2,035 2,042 1,886  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,465 1,430 1,385 1,321 1,246 1,133 978 750 341  
IBNR Reserves Dec. 31, 2018 (Audited) $ 271                  
Cumulative Number of Reported Claims (Audited) | item 117,368                  
Short-duration Insurance Contracts, Accident Year 2010 [Member] | Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 657 653 653 668 661 679 679 612 571  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 631 623 597 565 482 396 291 152 33  
IBNR Reserves Dec. 31, 2018 (Audited) $ 18                  
Cumulative Number of Reported Claims (Audited) | item 5,673                  
Short-duration Insurance Contracts, Accident Year 2010 [Member] | Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 457 459 465 469 477 488 475 464 463  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 442 437 425 409 380 351 313 278 $ 182  
IBNR Reserves Dec. 31, 2018 (Audited) $ 5                  
Cumulative Number of Reported Claims (Audited) | item 54,919                  
Short-duration Insurance Contracts, Accident Year 2011 [Member] | Business Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 908 913 935 972 998 1,065 1,074 1,004    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 799 762 725 660 539 355 187 47    
IBNR Reserves Dec. 31, 2018 (Audited) $ 80                  
Cumulative Number of Reported Claims (Audited) | item 27,444                  
Short-duration Insurance Contracts, Accident Year 2011 [Member] | Business Insurance [Member] | Commercial multi-peril [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 2,279 2,283 2,287 2,296 2,286 2,269 2,244 2,235    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 2,222 2,193 2,156 2,088 1,979 1,803 1,573 1,060    
IBNR Reserves Dec. 31, 2018 (Audited) $ 38                  
Cumulative Number of Reported Claims (Audited) | item 125,743                  
Short-duration Insurance Contracts, Accident Year 2011 [Member] | Business Insurance [Member] | Workers' compensation [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 2,348 2,363 2,385 2,379 2,350 2,347 2,303 2,284    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,696 1,652 1,583 1,487 1,365 1,185 911 420    
IBNR Reserves Dec. 31, 2018 (Audited) $ 356                  
Cumulative Number of Reported Claims (Audited) | item 136,728                  
Short-duration Insurance Contracts, Accident Year 2011 [Member] | Bond & Specialty Insurance [Member] | General liability [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 508 520 545 601 632 639 596 565    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 490 476 447 414 324 249 143 33    
IBNR Reserves Dec. 31, 2018 (Audited) $ (12)                  
Cumulative Number of Reported Claims (Audited) | item 5,212                  
Short-duration Insurance Contracts, Accident Year 2011 [Member] | Personal Insurance [Member] | International - Canada [Member] | Property-casualty [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 396 401 406 412 420 424 416 436    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 378 370 353 332 299 266 237 $ 167    
IBNR Reserves Dec. 31, 2018 (Audited) $ 4                  
Cumulative Number of Reported Claims (Audited) | item 55,783                  
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 2018) $ 917 905 892 913 935 985 989      
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 754 699 589 489 295 150 32      
IBNR Reserves Dec. 31, 2018 (Audited) $ 98                  
Cumulative Number of Reported Claims (Audited) | item 24,801                  
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 2018) $ 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 2018) 1,780 1,752 1,699 1,590 1,424 1,246 795      
IBNR Reserves Dec. 31, 2018 (Audited) $ 42                  
Cumulative Number of Reported Claims (Audited) | item 104,800                  
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 2018) $ 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 2018) 1,689 1,629 1,536 1,394 1,217 940 443      
IBNR Reserves Dec. 31, 2018 (Audited) $ 404                  
Cumulative Number of Reported Claims (Audited) | item 137,922                  
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 2018) $ 605 599 601 605 614 591 538      
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 436 419 383 342 255 160 38      
IBNR Reserves Dec. 31, 2018 (Audited) $ 97                  
Cumulative Number of Reported Claims (Audited) | item 4,853                  
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 2018) $ 355 361 377 378 394 393 413      
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 325 317 300 274 249 219 $ 157      
IBNR Reserves Dec. 31, 2018 (Audited) $ 12                  
Cumulative Number of Reported Claims (Audited) | item 51,226                  
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 2018) $ 933 927 940 958 975 965        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 745 639 498 363 175 35        
IBNR Reserves Dec. 31, 2018 (Audited) $ 101                  
Cumulative Number of Reported Claims (Audited) | item 22,446                  
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 2018) $ 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 2018) 1,475 1,410 1,304 1,167 987 644        
IBNR Reserves Dec. 31, 2018 (Audited) $ 51                  
Cumulative Number of Reported Claims (Audited) | item 83,667                  
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 2018) $ 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 2018) 1,604 1,525 1,413 1,237 954 458        
IBNR Reserves Dec. 31, 2018 (Audited) $ 473                  
Cumulative Number of Reported Claims (Audited) | item 132,424                  
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 2018) $ 607 654 630 606 565 510        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 434 400 352 252 154 34        
IBNR Reserves Dec. 31, 2018 (Audited) $ 103                  
Cumulative Number of Reported Claims (Audited) | item 4,442                  
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 2018) $ 421 422 435 446 455 461        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 368 351 320 289 258 $ 184        
IBNR Reserves Dec. 31, 2018 (Audited) $ 14                  
Cumulative Number of Reported Claims (Audited) | item 54,231                  
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 2018) $ 956 948 983 989 976          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 640 515 321 163 37          
IBNR Reserves Dec. 31, 2018 (Audited) $ 177                  
Cumulative Number of Reported Claims (Audited) | item 22,108                  
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Business Insurance [Member] | Commercial property [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 834 835 836 860 936          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 817 803 775 710 464          
IBNR Reserves Dec. 31, 2018 (Audited) $ 6                  
Cumulative Number of Reported Claims (Audited) | item 21,568                  
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 2018) $ 1,626 1,617 1,625 1,627 1,663          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,448 1,328 1,154 956 628          
IBNR Reserves Dec. 31, 2018 (Audited) $ 72                  
Cumulative Number of Reported Claims (Audited) | item 78,097                  
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Business Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 1,193 1,171 1,155 1,153 1,156          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,089 977 812 611 394          
IBNR Reserves Dec. 31, 2018 (Audited) $ 36                  
Cumulative Number of Reported Claims (Audited) | item 177,493                  
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 2018) $ 2,430 2,476 2,547 2,553 2,554          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,505 1,399 1,224 944 455          
IBNR Reserves Dec. 31, 2018 (Audited) $ 563                  
Cumulative Number of Reported Claims (Audited) | item 124,507                  
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 2018) $ 473 518 563 571 549          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 367 312 239 150 38          
IBNR Reserves Dec. 31, 2018 (Audited) $ 67                  
Cumulative Number of Reported Claims (Audited) | item 4,335                  
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Bond & Specialty Insurance [Member] | Fidelity and surety [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 130 136 165 212 223          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 124 127 111 96 58          
IBNR Reserves Dec. 31, 2018 (Audited) $ (4)                  
Cumulative Number of Reported Claims (Audited) | item 1,069                  
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Personal Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 1,980 1,985 1,981 1,994 2,014          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,936 1,879 1,763 1,564 1,193          
IBNR Reserves Dec. 31, 2018 (Audited) $ 14                  
Cumulative Number of Reported Claims (Audited) | item 670,431                  
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Personal Insurance [Member] | Homeowners (excluding Other) [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 1,451 1,457 1,453 1,450 1,515          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,433 1,425 1,402 1,338 1,053          
IBNR Reserves Dec. 31, 2018 (Audited) $ 7                  
Cumulative Number of Reported Claims (Audited) | item 151,705                  
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 2018) $ 405 412 423 422 408          
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 344 314 287 252 $ 180          
IBNR Reserves Dec. 31, 2018 (Audited) $ (3)                  
Cumulative Number of Reported Claims (Audited) | item 52,291                  
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 2018) $ 967 923 956 998            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 558 336 137 36            
IBNR Reserves Dec. 31, 2018 (Audited) $ 222                  
Cumulative Number of Reported Claims (Audited) | item 21,033                  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Business Insurance [Member] | Commercial property [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 731 741 750 786            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 699 681 615 376            
IBNR Reserves Dec. 31, 2018 (Audited) $ 6                  
Cumulative Number of Reported Claims (Audited) | item 20,143                  
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 2018) $ 1,597 1,593 1,625 1,568            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,310 1,144 970 595            
IBNR Reserves Dec. 31, 2018 (Audited) $ 110                  
Cumulative Number of Reported Claims (Audited) | item 71,242                  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Business Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 1,283 1,234 1,202 1,188            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,058 885 650 405            
IBNR Reserves Dec. 31, 2018 (Audited) $ 83                  
Cumulative Number of Reported Claims (Audited) | item 173,333                  
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 2018) $ 2,441 2,505 2,585 2,644            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,310 1,154 893 430            
IBNR Reserves Dec. 31, 2018 (Audited) $ 751                  
Cumulative Number of Reported Claims (Audited) | item 122,388                  
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 2018) $ 437 486 524 528            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 310 234 141 38            
IBNR Reserves Dec. 31, 2018 (Audited) $ 92                  
Cumulative Number of Reported Claims (Audited) | item 4,155                  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Bond & Specialty Insurance [Member] | Fidelity and surety [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 145 179 191 217            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 86 87 75 32            
IBNR Reserves Dec. 31, 2018 (Audited) $ 38                  
Cumulative Number of Reported Claims (Audited) | item 827                  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Personal Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 2,222 2,236 2,244 2,186            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 2,109 1,985 1,768 1,319            
IBNR Reserves Dec. 31, 2018 (Audited) $ 35                  
Cumulative Number of Reported Claims (Audited) | item 757,837                  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Personal Insurance [Member] | Homeowners (excluding Other) [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 1,452 1,461 1,454 1,438            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,421 1,395 1,333 994            
IBNR Reserves Dec. 31, 2018 (Audited) $ 10                  
Cumulative Number of Reported Claims (Audited) | item 145,088                  
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 2018) $ 339 342 342 343            
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 269 241 215 $ 154            
IBNR Reserves Dec. 31, 2018 (Audited) $ 16                  
Cumulative Number of Reported Claims (Audited) | item 45,201                  
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 2018) $ 1,087 1,058 1,075              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 421 191 35              
IBNR Reserves Dec. 31, 2018 (Audited) $ 439                  
Cumulative Number of Reported Claims (Audited) | item 19,190                  
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Business Insurance [Member] | Commercial property [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 820 863 896              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 745 685 441              
IBNR Reserves Dec. 31, 2018 (Audited) $ 22                  
Cumulative Number of Reported Claims (Audited) | item 22,267                  
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 2018) $ 1,598 1,623 1,662              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,133 950 585              
IBNR Reserves Dec. 31, 2018 (Audited) $ 204                  
Cumulative Number of Reported Claims (Audited) | item 68,024                  
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Business Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 1,371 1,303 1,278              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 931 688 412              
IBNR Reserves Dec. 31, 2018 (Audited) $ 191                  
Cumulative Number of Reported Claims (Audited) | item 182,647                  
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 2018) $ 2,569 2,690 2,768              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,118 873 421              
IBNR Reserves Dec. 31, 2018 (Audited) $ 863                  
Cumulative Number of Reported Claims (Audited) | item 122,493                  
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 2018) $ 504 511 512              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 233 141 30              
IBNR Reserves Dec. 31, 2018 (Audited) $ 153                  
Cumulative Number of Reported Claims (Audited) | item 4,235                  
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Bond & Specialty Insurance [Member] | Fidelity and surety [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 205 239 226              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 142 121 54              
IBNR Reserves Dec. 31, 2018 (Audited) $ 12                  
Cumulative Number of Reported Claims (Audited) | item 866                  
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Personal Insurance [Member] | Automobile [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 2,772 2,791 2,779              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 2,466 2,203 1,610              
IBNR Reserves Dec. 31, 2018 (Audited) $ 126                  
Cumulative Number of Reported Claims (Audited) | item 921,479                  
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Personal Insurance [Member] | Homeowners (excluding Other) [Member]                    
Claims Development                    
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) $ 1,525 1,547 1,556              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,455 1,392 1,049              
IBNR Reserves Dec. 31, 2018 (Audited) $ 27                  
Cumulative Number of Reported Claims (Audited) | item 143,797                  
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 2018) $ 389 389 343              
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 294 269 $ 201              
IBNR Reserves Dec. 31, 2018 (Audited) $ 32                  
Cumulative Number of Reported Claims (Audited) | item 45,728                  
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 2018) $ 1,143 1,133                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 180 40                
IBNR Reserves Dec. 31, 2018 (Audited) $ 717                  
Cumulative Number of Reported Claims (Audited) | item 16,464                  
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 2018) $ 1,177 1,209                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,003 618                
IBNR Reserves Dec. 31, 2018 (Audited) $ 30                  
Cumulative Number of Reported Claims (Audited) | item 24,855                  
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 2018) $ 1,928 1,872                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,199 716                
IBNR Reserves Dec. 31, 2018 (Audited) $ 357                  
Cumulative Number of Reported Claims (Audited) | item 69,218                  
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 2018) $ 1,501 1,386                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 746 456                
IBNR Reserves Dec. 31, 2018 (Audited) $ 401                  
Cumulative Number of Reported Claims (Audited) | item 190,126                  
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 2018) $ 2,681 2,779                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 890 433                
IBNR Reserves Dec. 31, 2018 (Audited) $ 1,179                  
Cumulative Number of Reported Claims (Audited) | item 119,890                  
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 2018) $ 517 534                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 155 38                
IBNR Reserves Dec. 31, 2018 (Audited) $ 266                  
Cumulative Number of Reported Claims (Audited) | item 4,128                  
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 2018) $ 271 244                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 166 70                
IBNR Reserves Dec. 31, 2018 (Audited) $ 64                  
Cumulative Number of Reported Claims (Audited) | item 863                  
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 2018) $ 3,256 3,323                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 2,575 1,912                
IBNR Reserves Dec. 31, 2018 (Audited) $ 341                  
Cumulative Number of Reported Claims (Audited) | item 1,059,610                  
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 2018) $ 2,340 2,312                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 2,059 1,471                
IBNR Reserves Dec. 31, 2018 (Audited) $ 101                  
Cumulative Number of Reported Claims (Audited) | item 168,357                  
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 2018) $ 362 329                
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 244 $ 173                
IBNR Reserves Dec. 31, 2018 (Audited) $ 26                  
Cumulative Number of Reported Claims (Audited) | item 46,545                  
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 2018) $ 1,253                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 42                  
IBNR Reserves Dec. 31, 2018 (Audited) $ 1,080                  
Cumulative Number of Reported Claims (Audited) | item 13,107                  
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 2018) $ 1,093                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 561                  
IBNR Reserves Dec. 31, 2018 (Audited) $ 73                  
Cumulative Number of Reported Claims (Audited) | item 21,547                  
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 2018) $ 1,976                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 792                  
IBNR Reserves Dec. 31, 2018 (Audited) $ 605                  
Cumulative Number of Reported Claims (Audited) | item 58,784                  
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 2018) $ 1,645                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 515                  
IBNR Reserves Dec. 31, 2018 (Audited) $ 736                  
Cumulative Number of Reported Claims (Audited) | item 185,419                  
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 2018) $ 2,744                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 440                  
IBNR Reserves Dec. 31, 2018 (Audited) $ 1,738                  
Cumulative Number of Reported Claims (Audited) | item 109,002                  
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 2018) $ 530                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 49                  
IBNR Reserves Dec. 31, 2018 (Audited) $ 406                  
Cumulative Number of Reported Claims (Audited) | item 2,894                  
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 2018) $ 220                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 64                  
IBNR Reserves Dec. 31, 2018 (Audited) $ 121                  
Cumulative Number of Reported Claims (Audited) | item 595                  
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 2018) $ 3,281                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,889                  
IBNR Reserves Dec. 31, 2018 (Audited) $ 825                  
Cumulative Number of Reported Claims (Audited) | item 960,293                  
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 2018) $ 2,610                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 1,657                  
IBNR Reserves Dec. 31, 2018 (Audited) $ 568                  
Cumulative Number of Reported Claims (Audited) | item 165,780                  
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 2018) $ 418                  
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Audited for 2018) 208                  
IBNR Reserves Dec. 31, 2018 (Audited) $ 89                  
Cumulative Number of Reported Claims (Audited) | item 46,883