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Segment Information (Operations By Segment) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]                      
Net premiums written                 $ 16,075 $ 15,372 $ 13,708
Net premiums earned 3,848 4,665 3,783 3,381 3,831 4,490 3,757 3,309 15,677 15,387 13,504
Losses and loss expenses 2,683 3,047 2,119 1,804 2,286 2,745 2,226 2,263 9,653 9,520 7,579
Policy benefits 142 130 102 147 119 83 108 91 521 401 357
Policy acquisition costs                 2,446 2,472 2,345
Administrative expenses                 2,096 2,068 1,873
Underwriting income (loss)                 961 926 1,350
Net investment income 567 533 537 544 565 564 569 544 2,181 2,242 2,070
Net realized gains (losses) including OTTI 272 (60) (394) 260 83 (760) (73) (45) 78 (795) 432
Interest expense                 250 250 224
Other (income) expense                 (6) 81 (10)
(Gains) losses from fair value changes in separate account assets                 (29) 36  
Other                 23 45  
Income tax expense (benefit)                 270 502 553
Net income (loss) 765 640 328 973 735 (39) 594 250 2,706 1,540 3,085
Insurance - North American
                     
Segment Reporting Information [Line Items]                      
Net premiums written                 7,208 6,851 5,797
Net premiums earned                 7,019 6,911 5,651
Losses and loss expenses                 5,626 5,276 3,918
Policy benefits                         
Policy acquisition costs                 586 612 626
Administrative expenses                 601 592 561
Underwriting income (loss)                 206 431 546
Net investment income                 1,091 1,170 1,138
Net realized gains (losses) including OTTI                 42 34 417
Interest expense                 12 15 9
Other (income) expense                     (22)
(Gains) losses from fair value changes in separate account assets                    0  
Other                 (9) 5  
Income tax expense (benefit)                 200 395 435
Net income (loss)                 1,136 1,220 1,679
Insurance - Overseas General
                     
Segment Reporting Information [Line Items]                      
Net premiums written                 5,863 5,629 5,189
Net premiums earned                 5,740 5,614 5,153
Losses and loss expenses                 2,862 3,029 2,615
Policy benefits                         
Policy acquisition costs                 1,353 1,335 1,209
Administrative expenses                 935 939 837
Underwriting income (loss)                 590 311 492
Net investment income                 521 546 473
Net realized gains (losses) including OTTI                 103 33 123
Interest expense                 5 5 1
Other (income) expense                     (13)
(Gains) losses from fair value changes in separate account assets                        
Other                 3     
Income tax expense (benefit)                 133 164 171
Net income (loss)                 1,073 721 929
Global Reinsurance
                     
Segment Reporting Information [Line Items]                      
Net premiums written                 1,025 979 1,075
Net premiums earned                 1,002 1,003 1,071
Losses and loss expenses                 553 621 518
Policy benefits                         
Policy acquisition costs                 172 185 204
Administrative expenses                 51 52 55
Underwriting income (loss)                 226 145 294
Net investment income                 290 287 288
Net realized gains (losses) including OTTI                 6 (50) 93
Interest expense                 4 2   
Other (income) expense                     (23)
(Gains) losses from fair value changes in separate account assets                        
Other                 (15) (1)  
Income tax expense (benefit)                 15 30 42
Net income (loss)                 518 351 656
Life
                     
Segment Reporting Information [Line Items]                      
Management underwriting income loss Insurance                 402    
Net premiums written                 1,979 1,913 1,647
Net premiums earned                 1,916 1,859 1,629
Losses and loss expenses                 611 593 528
Policy benefits                 521 401 357
Policy acquisition costs                 334 339 306
Administrative expenses                 328 317 246
Underwriting income (loss)                 122 209 192
Net investment income                 251 226 174
Net realized gains (losses) including OTTI                 (72) (806) (192)
Interest expense                 12 11 3
Other (income) expense                     26
(Gains) losses from fair value changes in separate account assets                 (29) 36  
Other                 25 26  
Income tax expense (benefit)                 58 50 59
Net income (loss)                 235 (494) 86
Corporate and Other
                     
Segment Reporting Information [Line Items]                      
Net premiums written                         
Net premiums earned                         
Losses and loss expenses                 1 1   
Policy benefits                         
Policy acquisition costs                 1 1   
Administrative expenses                 181 168 174
Underwriting income (loss)                 (183) (170) (174)
Net investment income                 28 13 (3)
Net realized gains (losses) including OTTI                 (1) (6) (9)
Interest expense                 217 217 211
Other (income) expense                     22
(Gains) losses from fair value changes in separate account assets                        
Other                 19 15  
Income tax expense (benefit)                 (136) (137) (154)
Net income (loss)                 $ (256) $ (258) $ (265)