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Segment Information (Operations By Segment) (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Derivative, Gain (Loss) on Derivative, Net                 $ 87 $ (126) $ (193)
Net premiums written                 29,244 28,145 17,713
Net premiums earned $ 7,218 $ 7,807 $ 7,237 $ 6,772 $ 7,059 $ 7,688 $ 7,405 $ 6,597 29,034 28,749 17,213
Losses and loss expenses 4,272 6,247 4,146 3,789 3,855 4,269 4,254 3,674 18,454 16,052 9,484
Policy benefits 176 169 163 168 161 155 146 126 676 588 543
Policy Acquisition Costs                 5,781 5,904 2,941
Administrative expenses                 2,833 3,081 2,270
Underwriting income (loss)                 1,290 3,124 1,975
Net Investment Income 797 813 770 745 744 739 708 674 3,125 2,865 2,194
Other (Income) Expense                 (400) (222) (51)
Segment Underwriting Income Loss and Net Investment Income Loss                 4,555 6,192 4,049
Net realized gains (losses) including OTTI 0 (10) 101 (7) 365 100 (216) (394) 84 (145) (420)
Interest expense                 607 605 300
Other (income) expense                 (400) (222) (51)
Amortization of Purchased Intangibles                 260 19 171
Chubb integration expenses                 310 492 33
(Gains) losses from fair value changes in separate account assets [1]                 97 11 (19)
Income tax expense (benefit)                 (139) 815 462
Net income $ 1,533 $ (70) $ 1,305 $ 1,093 $ 1,610 $ 1,360 $ 726 $ 439 3,861 4,135 2,834
North America Commercial P&C Insurance                      
Segment Reporting Information [Line Items]                      
Net premiums written                 12,028 11,740 5,715
Net premiums earned                 12,191 12,217 5,634
Losses and loss expenses                 8,287 7,439 3,661
Policy benefits                 0 0 0
Policy Acquisition Costs                 1,873 2,023 531
Administrative expenses                 981 1,125 621
Underwriting income (loss)                 1,050 1,630 821
Net Investment Income                 1,961 1,860 1,032
Other (Income) Expense                 1 (2) (7)
Segment Underwriting Income Loss and Net Investment Income Loss                 3,010 3,492 1,860
Amortization of Purchased Intangibles                 0 0 0
North American Personal P&C [Member]                      
Segment Reporting Information [Line Items]                      
Net premiums written                 4,533 4,153 1,192
Net premiums earned                 4,399 4,319 948
Losses and loss expenses                 3,265 2,558 590
Policy benefits                 0 0 0
Policy Acquisition Costs                 899 966 69
Administrative expenses                 264 363 123
Underwriting income (loss)                 (29) 432 166
Net Investment Income                 226 207 25
Other (Income) Expense                 4 6 2
Segment Underwriting Income Loss and Net Investment Income Loss                 177 614 111
Amortization of Purchased Intangibles                 16 19 78
North America Agricultural Insurance                      
Segment Reporting Information [Line Items]                      
Segment Income Loss Including Gains Losses On Crop Derivatives                 392    
Derivative, Gain (Loss) on Derivative, Net                 7    
Net premiums written                 1,516 1,328 1,346
Net premiums earned                 1,508 1,316 1,364
Losses and loss expenses                 1,036 893 1,088
Policy benefits                 0 0 0
Policy Acquisition Costs                 81 83 69
Administrative expenses                 (8) (6) 1
Underwriting income (loss)                 399 346 206
Net Investment Income                 25 20 23
Other (Income) Expense                 2 1 1
Segment Underwriting Income Loss and Net Investment Income Loss                 393 336 198
Amortization of Purchased Intangibles                 29 29 30
Overseas General Insurance                      
Segment Reporting Information [Line Items]                      
Net premiums written                 8,341 8,124 6,634
Net premiums earned                 8,131 8,132 6,471
Losses and loss expenses                 4,281 4,005 3,052
Policy benefits                 0 0 0
Policy Acquisition Costs                 2,221 2,136 1,581
Administrative expenses                 982 1,057 997
Underwriting income (loss)                 647 934 841
Net Investment Income                 610 600 534
Other (Income) Expense                 (4) (11) (17)
Segment Underwriting Income Loss and Net Investment Income Loss                 1,216 1,497 1,331
Amortization of Purchased Intangibles                 45 48 61
Global Reinsurance                      
Segment Reporting Information [Line Items]                      
Net premiums written                 685 676 828
Net premiums earned                 704 710 849
Losses and loss expenses                 561 325 290
Policy benefits                 0 0 0
Policy Acquisition Costs                 177 187 214
Administrative expenses                 44 52 49
Underwriting income (loss)                 (78) 146 296
Net Investment Income                 273 263 300
Other (Income) Expense                 (1) (4) (6)
Segment Underwriting Income Loss and Net Investment Income Loss                 196 413 602
Amortization of Purchased Intangibles                 0 0 0
Life Insurance                      
Segment Reporting Information [Line Items]                      
Management underwriting income loss Insurance                 263    
Net premiums written                 2,141 2,124 1,998
Net premiums earned                 2,101 2,055 1,947
Losses and loss expenses                 739 663 601
Policy benefits                 676 588 543
Policy Acquisition Costs                 530 509 476
Administrative expenses                 303 307 291
Underwriting income (loss)                 (147) (12) 36
Net Investment Income                 313 283 265
Other (Income) Expense                 (84) 5 23
Segment Underwriting Income Loss and Net Investment Income Loss                 248 263 276
Amortization of Purchased Intangibles                 2 3 2
(Gains) losses from fair value changes in separate account assets                 97    
Corporate and Other                      
Segment Reporting Information [Line Items]                      
Net premiums written                 0 0 0
Net premiums earned                 0 0 0
Losses and loss expenses                 285 169 202
Policy benefits                 0 0 0
Policy Acquisition Costs                 0 0 1
Administrative expenses                 267 183 188
Underwriting income (loss)                 (552) (352) (391)
Net Investment Income                 (283) (368) 15
Other (Income) Expense                 (318) (217) (47)
Segment Underwriting Income Loss and Net Investment Income Loss                 (685) (423) (329)
Net realized gains (losses) including OTTI                 84 (145) (420)
Interest expense                 607 605 300
Amortization of Purchased Intangibles                 168 (80) 0
Chubb integration expenses                 310 492 33
Income tax expense (benefit)                 (139) 815 462
Net income                 $ (1,379) $ (2,480) $ (1,544)
[1] (1) Related to (gains) losses from fair value changes in separate account assets that do not qualify for separate account reporting under GAAP.