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INSURANCE LIABILITIES (Details - Undiscounted, Incurred and Paid Losses and Allocated Loss Adjustment Expenses
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2008
USD ($)
Dec. 31, 2007
USD ($)
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 8,746                  
All outstanding liabilities before 2007, net of reinsurance 1,537                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below (7,690)                  
U.S. Workers Compensation                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance 28,764                  
All outstanding liabilities before 2007, net of reinsurance 3,429                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 13,069                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below (19,124)                  
2016 Prior Year Development 1,920                  
Unallocated Loss Adjustment Expense Prior Year Development 13                  
Total 1,057                  
U.S. Excess Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance 14,902                  
All outstanding liabilities before 2007, net of reinsurance 1,537                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 8,749                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below (7,690)                  
2016 Prior Year Development 1,058 $ 1,400 $ (106)              
Unallocated Loss Adjustment Expense Prior Year Development (67)                  
Total 1,099                  
U.S. Other Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance 23,085                  
All outstanding liabilities before 2007, net of reinsurance 1,505                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below (15,844)                  
2016 Prior Year Development 1,563                  
Unallocated Loss Adjustment Expense Prior Year Development 116                  
Total 1,160                  
U.S. Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance 18,377                  
All outstanding liabilities before 2007, net of reinsurance 411                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 6,102                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below (12,686)                  
2016 Prior Year Development 306 502 160              
Unallocated Loss Adjustment Expense Prior Year Development 37                  
Total 237                  
Europe Casualty and Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance 13,202                  
All outstanding liabilities before 2007, net of reinsurance 390                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 5,587                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below (8,005)                  
2016 Prior Year Development 355 139 24              
Unallocated Loss Adjustment Expense Prior Year Development 2                  
Total 360                  
U.S. And Europe                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance 32,284                  
All outstanding liabilities before 2007, net of reinsurance 97                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 5,913                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below (26,468)                  
2016 Prior Year Development 402 (128)                
Unallocated Loss Adjustment Expense Prior Year Development 42                  
Total 354                  
U.S. Europe And Japan                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance 46,773                  
All outstanding liabilities before 2007, net of reinsurance 26                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 3,454                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below (43,345)                  
2016 Prior Year Development (114)                  
Unallocated Loss Adjustment Expense Prior Year Development 3                  
Total (114)                  
U.S. Long Tail Insurance Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance 6,260                  
All outstanding liabilities before 2007, net of reinsurance 3,878                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 5,967                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below (4,171)                  
2016 Prior Year Development 390                  
Unallocated Loss Adjustment Expense Prior Year Development (5)                  
Total 50                  
Prior to 2007                    
Claims Development [LineItems]                    
2016 Prior Year Development 1,544 1,798 1,070              
Prior to 2007 | U.S. Workers Compensation                    
Claims Development [LineItems]                    
2016 Prior Year Development 850 122 158              
Prior to 2007 | U.S. Excess Casualty                    
Claims Development [LineItems]                    
2016 Prior Year Development 26 476 437              
Prior to 2007 | U.S. Other Casualty                    
Claims Development [LineItems]                    
2016 Prior Year Development 287 366 242              
Prior to 2007 | U.S. Financial Lines                    
Claims Development [LineItems]                    
2016 Prior Year Development 32 135 (24)              
Prior to 2007 | Europe Casualty and Financial Lines                    
Claims Development [LineItems]                    
2016 Prior Year Development (7)                  
Prior to 2007 | U.S. And Europe                    
Claims Development [LineItems]                    
2016 Prior Year Development 6                  
Prior to 2007 | U.S. Europe And Japan                    
Claims Development [LineItems]                    
2016 Prior Year Development (3)                  
Prior to 2007 | U.S. Long Tail Insurance Lines                    
Claims Development [LineItems]                    
2016 Prior Year Development 345                  
Prior to 2007 | Property And Special Risks [Member]                    
Claims Development [LineItems]                    
2016 Prior Year Development 6 16 (4)              
Prior to 2007 | Legacy portfolio [Member]                    
Claims Development [LineItems]                    
2016 Prior Year Development 345 621 258              
Prior to 2007 | All Other                    
Claims Development [LineItems]                    
2016 Prior Year Development (2) 62 3              
2007 | U.S. Workers Compensation                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance 4,548 4,395 4,379 $ 4,469 $ 4,513 $ 4,528 $ 4,544 $ 4,414 $ 4,441 $ 4,505
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 3,855 3,773 3,665 3,577 3,359 3,122 2,844 2,452 1,856 926
2016 Prior Year Development 153                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 392                  
Cumulative Number of Reported Claims | item 225,243                  
2007 | U.S. Excess Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 2,194 2,113 2,183 2,208 2,232 2,072 2,246 1,752 1,820 1,854
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,857 1,796 1,712 1,613 1,402 1,085 732 301 102 8
2016 Prior Year Development 81                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 228                  
Cumulative Number of Reported Claims | item 6,423                  
2007 | U.S. Other Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 2,874 2,846 2,774 2,787 2,805 2,770 2,736 2,615 2,633 2,892
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,577 2,525 2,422 2,377 2,244 1,974 1,621 1,206 773 386
2016 Prior Year Development 28                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 166                  
Cumulative Number of Reported Claims | item 102,070                  
2007 | U.S. Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,968 1,972 1,932 1,964 2,008 2,022 2,015 2,079 2,091 1,900
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,811 1,800 1,748 1,684 1,531 1,364 1,184 816 413 61
2016 Prior Year Development (4)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 74                  
Cumulative Number of Reported Claims | item 19,088                  
2007 | Europe Casualty and Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,184 1,178 1,171 1,167 1,088 1,094 1,057 1,084 1,073 1,047
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,067 1,025 996 961 846 765 632 454 297 88
2016 Prior Year Development 6                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 14                  
Cumulative Number of Reported Claims | item 191,746                  
2007 | U.S. And Europe                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 2,070 2,072 2,069 2,073 2,073 2,087 2,119 2,153 2,061 2,259
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,007 2,006 1,982 1,962 1,930 1,880 1,784 1,629 1,294 520
2016 Prior Year Development (2)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 34                  
Cumulative Number of Reported Claims | item 88,737                  
2007 | U.S. Europe And Japan                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 4,744 4,745 4,742 4,742 4,739 4,729 4,710 4,725 4,805 4,662
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 4,731 4,727 4,717 4,699 4,670 4,628 4,547 4,395 4,162 2,867
2016 Prior Year Development (1)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 4                  
Cumulative Number of Reported Claims | item 1,737,033                  
2007 | U.S. Long Tail Insurance Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 876 860 859 851 843 833 801 807 743 959
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 784 770 751 710 641 578 431 321 230 $ 145
2016 Prior Year Development 16                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 55                  
Cumulative Number of Reported Claims | item 56,148                  
2008 | U.S. Workers Compensation                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 4,547 4,398 4,385 4,398 4,471 4,425 4,422 4,184 4,114  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 3,707 3,609 3,476 3,272 3,044 2,655 2,252 1,678 785  
2016 Prior Year Development 149                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 504                  
Cumulative Number of Reported Claims | item 198,597                  
2008 | U.S. Excess Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,638 1,667 1,721 1,884 1,832 1,951 2,173 2,000 1,979  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,226 1,172 1,061 954 842 667 439 97 11  
2016 Prior Year Development (29)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 228                  
Cumulative Number of Reported Claims | item 4,561                  
2008 | U.S. Other Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 3,113 3,074 3,007 2,903 2,901 2,821 2,757 2,693 2,886  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,755 2,651 2,506 2,316 2,039 1,691 1,171 711 277  
2016 Prior Year Development 39                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 274                  
Cumulative Number of Reported Claims | item 116,937                  
2008 | U.S. Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 2,112 2,089 1,964 1,906 1,970 1,861 2,049 2,084 1,911  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,001 1,898 1,712 1,590 1,385 1,183 888 420 32  
2016 Prior Year Development 23                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 32                  
Cumulative Number of Reported Claims | item 21,709                  
2008 | Europe Casualty and Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,426 1,420 1,458 1,430 1,424 1,401 1,424 1,396 1,311  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,304 1,242 1,199 1,128 1,014 870 655 429 116  
2016 Prior Year Development 6                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 53                  
Cumulative Number of Reported Claims | item 238,417                  
2008 | U.S. And Europe                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 4,124 4,132 4,140 4,169 4,225 4,276 4,318 4,360 4,114  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 4,064 4,046 4,030 4,013 3,970 3,825 3,600 3,029 1,455  
2016 Prior Year Development (8)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 31                  
Cumulative Number of Reported Claims | item 95,060                  
2008 | U.S. Europe And Japan                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 4,630 4,631 4,625 4,621 4,618 4,611 4,592 4,592 4,535  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 4,608 4,596 4,584 4,557 4,511 4,432 4,275 3,958 2,781  
2016 Prior Year Development (1)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 9                  
Cumulative Number of Reported Claims | item 1,851,828                  
2008 | U.S. Long Tail Insurance Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 967 961 964 911 895 855 872 1,025 936  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 830 817 773 711 643 559 485 360 $ 130  
2016 Prior Year Development 6                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 75                  
Cumulative Number of Reported Claims | item 40,046                  
2009 | U.S. Workers Compensation                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 3,733 3,606 3,616 3,639 3,666 3,608 3,633 3,466    
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,887 2,780 2,621 2,390 2,120 1,756 1,328 630    
2016 Prior Year Development 127                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 547                  
Cumulative Number of Reported Claims | item 147,209                  
2009 | U.S. Excess Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,520 1,418 1,328 1,465 1,650 1,812 1,920 1,851    
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,175 965 788 624 449 249 69 8    
2016 Prior Year Development 102                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 224                  
Cumulative Number of Reported Claims | item 3,689                  
2009 | U.S. Other Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 2,791 2,807 2,745 2,624 2,509 2,513 2,445 2,343    
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,534 2,314 2,168 1,929 1,577 1,180 770 378    
2016 Prior Year Development (16)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 151                  
Cumulative Number of Reported Claims | item 89,845                  
2009 | U.S. Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 2,289 2,196 2,203 2,102 1,909 1,855 1,806 1,719    
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,075 1,968 1,839 1,614 1,273 887 499 129    
2016 Prior Year Development 93                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 34                  
Cumulative Number of Reported Claims | item 22,595                  
2009 | Europe Casualty and Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,759 1,704 1,699 1,689 1,661 1,659 1,627 1,539    
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,421 1,309 1,156 1,033 881 645 379 125    
2016 Prior Year Development 55                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 78                  
Cumulative Number of Reported Claims | item 232,281                  
2009 | U.S. And Europe                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 2,272 2,265 2,285 2,282 2,327 2,318 2,320 2,608    
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,206 2,184 2,156 2,097 1,985 1,780 1,438 661    
2016 Prior Year Development 7                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 32                  
Cumulative Number of Reported Claims | item 79,096                  
2009 | U.S. Europe And Japan                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 4,611 4,612 4,614 4,616 4,624 4,590 4,634 4,698    
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 4,587 4,570 4,545 4,504 4,428 4,268 4,016 2,780    
2016 Prior Year Development (1)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 7                  
Cumulative Number of Reported Claims | item 1,959,522                  
2009 | U.S. Long Tail Insurance Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 564 584 588 621 566 532 523 543    
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 431 414 394 354 273 220 125 $ 38    
2016 Prior Year Development (20)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 91                  
Cumulative Number of Reported Claims | item 16,213                  
2010 | U.S. Workers Compensation                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 3,311 3,214 3,211 3,148 3,125 3,049 2,706      
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,426 2,288 2,126 1,855 1,537 1,093 550      
2016 Prior Year Development 97                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 550                  
Cumulative Number of Reported Claims | item 132,987                  
2010 | U.S. Excess Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,722 1,736 1,649 1,782 2,091 2,094 1,885      
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,052 946 795 654 475 197 10      
2016 Prior Year Development (14)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 399                  
Cumulative Number of Reported Claims | item 3,459                  
2010 | U.S. Other Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 2,420 2,301 2,258 2,109 2,160 2,016 2,037      
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,889 1,741 1,557 1,275 902 578 279      
2016 Prior Year Development 119                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 329                  
Cumulative Number of Reported Claims | item 95,749                  
2010 | U.S. Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,485 1,470 1,373 1,381 1,420 1,526 1,576      
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,281 1,180 1,017 800 566 285 31      
2016 Prior Year Development 15                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 46                  
Cumulative Number of Reported Claims | item 20,126                  
2010 | Europe Casualty and Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,250 1,252 1,218 1,277 1,255 1,258 1,300      
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 995 936 850 725 570 378 133      
2016 Prior Year Development (2)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 103                  
Cumulative Number of Reported Claims | item 265,264                  
2010 | U.S. And Europe                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 2,692 2,684 2,716 2,710 2,687 2,747 3,014      
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,612 2,570 2,496 2,396 2,207 1,849 828      
2016 Prior Year Development 8                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 25                  
Cumulative Number of Reported Claims | item 78,713                  
2010 | U.S. Europe And Japan                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 4,832 4,832 4,838 4,836 4,846 4,826 4,819      
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 4,788 4,764 4,721 4,643 4,496 4,184 2,920      
2016 Prior Year Development 0                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 13                  
Cumulative Number of Reported Claims | item 2,215,816                  
2010 | U.S. Long Tail Insurance Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 601 572 576 548 527 521 633      
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 445 425 395 313 235 142 $ 55      
2016 Prior Year Development 29                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 81                  
Cumulative Number of Reported Claims | item 8,475                  
2011 | U.S. Workers Compensation                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 3,152 3,113 3,158 3,091 2,953 2,901        
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,285 2,129 1,884 1,561 1,129 519        
2016 Prior Year Development 39                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 521                  
Cumulative Number of Reported Claims | item 124,486                  
2011 | U.S. Excess Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,611 1,528 1,427 1,595 1,824 1,784        
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 921 716 387 225 63 5        
2016 Prior Year Development 83                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 425                  
Cumulative Number of Reported Claims | item 3,368                  
2011 | U.S. Other Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 2,639 2,601 2,458 2,321 2,222 1,970        
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,048 1,822 1,488 1,109 726 235        
2016 Prior Year Development 38                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 381                  
Cumulative Number of Reported Claims | item 74,916                  
2011 | U.S. Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,951 1,921 1,887 1,897 1,729 1,812        
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,749 1,529 1,210 886 494 165        
2016 Prior Year Development 30                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 66                  
Cumulative Number of Reported Claims | item 20,008                  
2011 | Europe Casualty and Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,377 1,364 1,284 1,239 1,175 1,239        
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 985 868 733 507 339 127        
2016 Prior Year Development 13                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 157                  
Cumulative Number of Reported Claims | item 256,431                  
2011 | U.S. And Europe                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 3,532 3,491 3,511 3,514 3,586 3,757        
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 3,370 3,284 3,134 2,924 2,400 1,049        
2016 Prior Year Development 41                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 47                  
Cumulative Number of Reported Claims | item 79,542                  
2011 | U.S. Europe And Japan                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 5,250 5,258 5,272 5,275 5,315 5,226        
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 5,182 5,146 5,064 4,927 4,631 3,270        
2016 Prior Year Development (8)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 25                  
Cumulative Number of Reported Claims | item 2,159,211                  
2011 | U.S. Long Tail Insurance Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 678 669 635 571 538 528        
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 525 442 379 253 135 $ 19        
2016 Prior Year Development 9                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 88                  
Cumulative Number of Reported Claims | item 7,776                  
2012 | U.S. Workers Compensation                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 2,334 2,260 2,286 2,194 2,382          
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,440 1,272 1,089 804 415          
2016 Prior Year Development 74                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 571                  
Cumulative Number of Reported Claims | item 70,426                  
2012 | U.S. Excess Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,566 1,486 1,239 1,400 1,604          
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 649 495 288 106 3          
2016 Prior Year Development 80                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 621                  
Cumulative Number of Reported Claims | item 3,252                  
2012 | U.S. Other Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 2,325 2,183 2,172 2,049 1,866          
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,644 1,349 1,002 712 382          
2016 Prior Year Development 142                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 381                  
Cumulative Number of Reported Claims | item 41,586                  
2012 | U.S. Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,942 1,889 1,782 1,747 1,579          
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,497 1,253 815 406 76          
2016 Prior Year Development 53                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 199                  
Cumulative Number of Reported Claims | item 20,029                  
2012 | Europe Casualty and Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,146 1,081 1,005 1,041 1,074          
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 734 615 438 303 110          
2016 Prior Year Development 65                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 172                  
Cumulative Number of Reported Claims | item 209,632                  
2012 | U.S. And Europe                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 4,329 4,216 4,232 4,285 4,154          
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 3,995 3,789 3,458 2,794 878          
2016 Prior Year Development 113                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 76                  
Cumulative Number of Reported Claims | item 71,951                  
2012 | U.S. Europe And Japan                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 4,943 4,956 4,998 5,028 5,135          
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 4,858 4,774 4,624 4,333 2,868          
2016 Prior Year Development (13)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 15                  
Cumulative Number of Reported Claims | item 2,096,881                  
2012 | U.S. Long Tail Insurance Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 745 781 736 674 623          
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 476 409 282 191 $ 85          
2016 Prior Year Development (36)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 105                  
Cumulative Number of Reported Claims | item 4,033                  
2013 | U.S. Workers Compensation                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 2,060 1,950 1,880 1,932            
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,067 879 619 282            
2016 Prior Year Development 110                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 645                  
Cumulative Number of Reported Claims | item 46,175                  
2013 | U.S. Excess Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,276 1,136 998 1,096            
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 386 206 105 15            
2016 Prior Year Development 140                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 672                  
Cumulative Number of Reported Claims | item 2,494                  
2013 | U.S. Other Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 2,116 1,882 1,702 1,580            
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,206 918 553 169            
2016 Prior Year Development 234                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 570                  
Cumulative Number of Reported Claims | item 36,174                  
2013 | U.S. Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,567 1,622 1,669 1,741            
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 949 687 333 43            
2016 Prior Year Development (55)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 417                  
Cumulative Number of Reported Claims | item 18,912                  
2013 | Europe Casualty and Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,124 1,109 1,124 1,080            
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 664 493 340 95            
2016 Prior Year Development 15                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 182                  
Cumulative Number of Reported Claims | item 176,010                  
2013 | U.S. And Europe                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 2,781 2,715 2,877 2,837            
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,328 2,128 1,775 771            
2016 Prior Year Development 66                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 138                  
Cumulative Number of Reported Claims | item 69,782                  
2013 | U.S. Europe And Japan                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 4,576 4,602 4,640 4,714            
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 4,408 4,261 3,963 2,671            
2016 Prior Year Development (26)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 52                  
Cumulative Number of Reported Claims | item 2,023,707                  
2013 | U.S. Long Tail Insurance Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 566 585 530 477            
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 316 258 152 $ 86            
2016 Prior Year Development (19)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 152                  
Cumulative Number of Reported Claims | item 2,483                  
2014 | U.S. Workers Compensation                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,916 1,764 1,729              
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 786 558 231              
2016 Prior Year Development 152                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 807                  
Cumulative Number of Reported Claims | item 39,000                  
2014 | U.S. Excess Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,185 996 873              
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 211 70 3              
2016 Prior Year Development 189                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 788                  
Cumulative Number of Reported Claims | item 1,791                  
2014 | U.S. Other Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,920 1,677 1,695              
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 816 566 204              
2016 Prior Year Development 243                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 749                  
Cumulative Number of Reported Claims | item 33,677                  
2014 | U.S. Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,775 1,712 1,742              
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 854 371 66              
2016 Prior Year Development 63                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 612                  
Cumulative Number of Reported Claims | item 17,091                  
2014 | Europe Casualty and Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,166 1,123 1,143              
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 447 273 79              
2016 Prior Year Development 43                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 376                  
Cumulative Number of Reported Claims | item 164,208                  
2014 | U.S. And Europe                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 3,244 3,154 3,307              
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,547 2,076 951              
2016 Prior Year Development 90                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 235                  
Cumulative Number of Reported Claims | item 81,948                  
2014 | U.S. Europe And Japan                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 4,376 4,392 4,376              
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 4,024 3,708 2,495              
2016 Prior Year Development (16)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 126                  
Cumulative Number of Reported Claims | item 2,008,729                  
2014 | U.S. Long Tail Insurance Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 451 472 374              
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 183 93 $ 20              
2016 Prior Year Development (21)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 192                  
Cumulative Number of Reported Claims | item 2,246                  
2015 | U.S. Workers Compensation                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,864 1,708                
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 524 234                
2016 Prior Year Development 156                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 1,027                  
Cumulative Number of Reported Claims | item 34,241                  
2015 | U.S. Excess Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,380 913                
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 196 9                
2016 Prior Year Development 467                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 972                  
Cumulative Number of Reported Claims | item 1,325                  
2015 | U.S. Other Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,607 1,274                
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 303 93                
2016 Prior Year Development 333                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 909                  
Cumulative Number of Reported Claims | item 29,372                  
2015 | U.S. Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,689 1,670                
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 393 66                
2016 Prior Year Development 19                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 1,045                  
Cumulative Number of Reported Claims | item 15,386                  
2015 | Europe Casualty and Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,363 1,204                
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 261 74                
2016 Prior Year Development 159                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 736                  
Cumulative Number of Reported Claims | item 175,571                  
2015 | U.S. And Europe                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 3,607 3,568                
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,255 1,094                
2016 Prior Year Development 39                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 500                  
Cumulative Number of Reported Claims | item 82,836                  
2015 | U.S. Europe And Japan                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 4,385 4,433                
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 3,712 2,497                
2016 Prior Year Development (48)                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 276                  
Cumulative Number of Reported Claims | item 1,949,211                  
2015 | U.S. Long Tail Insurance Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 520 434                
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 129 $ 34                
2016 Prior Year Development 86                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 204                  
Cumulative Number of Reported Claims | item 2,154                  
2016 | U.S. Workers Compensation                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,299                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 147                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 965                  
Cumulative Number of Reported Claims | item 25,164                  
2016 | U.S. Excess Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 810                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 17                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 748                  
Cumulative Number of Reported Claims | item 540                  
2016 | U.S. Other Casualty                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,280                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 72                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 1,044                  
Cumulative Number of Reported Claims | item 19,774                  
2016 | U.S. Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,599                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 76                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 1,392                  
Cumulative Number of Reported Claims | item 14,001                  
2016 | Europe Casualty and Financial Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,407                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 127                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 1,029                  
Cumulative Number of Reported Claims | item 178,185                  
2016 | U.S. And Europe                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 3,633                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,084                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 921                  
Cumulative Number of Reported Claims | item 61,956                  
2016 | U.S. Europe And Japan                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 4,426                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,447                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 902                  
Cumulative Number of Reported Claims | item 1,702,448                  
2016 | U.S. Long Tail Insurance Lines                    
Claims Development [LineItems]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 292                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 52                  
Total of IBNR Liabilities Plus Expected Development on Reported Losses $ 197                  
Cumulative Number of Reported Claims | item 1,483