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Segment Information (Operations By Segment) (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Net premiums written                 $ 30,579 $ 29,244 $ 28,145
Net premiums earned $ 7,465 $ 7,908 $ 7,664 $ 7,027 $ 7,218 $ 7,807 $ 7,237 $ 6,772 30,064 29,034 28,749
Losses and loss expenses 4,610 4,868 4,487 4,102 4,272 6,247 4,146 3,789 18,067 18,454 16,052
Policy benefits 162 127 150 151 176 169 163 168 590 676 588
Policy Acquisition Costs                 5,912 5,781 5,904
Administrative expenses                 2,886 2,833 3,081
Underwriting income (loss)                 2,609 1,290 3,124
Net Investment Income 848 823 828 806 797 813 770 745 3,305 3,125 2,865
Other (Income) Expense                 (434) (400) (222)
Amortization of Purchased Intangibles                 339 260 19
Segment Underwriting Income Loss and Net Investment Income Loss                 6,009 4,555 6,192
Realized Gain (Loss) on Marketable Securities, Cost Method Investments, and Other Investments           (10) 101 (7)   84 (145)
Net Realized Gain (Loss) (687) 19 18 (2)         (652)    
Interest expense                 641 607 605
Chubb integration expenses                 59 310 492
Income tax expense (benefit)                 695 (139) 815
Net income $ 355 $ 1,231 $ 1,294 $ 1,082 $ 1,533 $ (70) $ 1,305 $ 1,093 3,962 3,861 4,135
Derivative, Gain (Loss) on Derivative, Net                 (330) 87 (126)
Other (income) expense                 (434) (400) (222)
(Gains) losses from fair value changes in separate account assets [1]                 (38) 97 11
North America Commercial P&C Insurance                      
Segment Reporting Information [Line Items]                      
Net premiums written                 12,485 12,019 [2] 11,740
Net premiums earned                 12,402 12,191 12,217
Losses and loss expenses                 8,000 8,287 7,439
Policy benefits                 0 0 0
Policy Acquisition Costs                 1,829 1,873 2,023
Administrative expenses                 966 981 1,125
Underwriting income (loss)                 1,607 1,050 1,630
Net Investment Income                 2,033 1,961 1,860
Other (Income) Expense                 (25) 1 (2)
Amortization of Purchased Intangibles                 0 0 0
Segment Underwriting Income Loss and Net Investment Income Loss                 3,665 3,010 3,492
North American Personal P&C [Member]                      
Segment Reporting Information [Line Items]                      
Net premiums written                 4,674 4,533 4,153
Net premiums earned                 4,593 4,399 4,319
Losses and loss expenses                 3,229 3,265 2,558
Policy benefits                 0 0 0
Policy Acquisition Costs                 939 899 966
Administrative expenses                 269 264 363
Underwriting income (loss)                 156 (29) 432
Net Investment Income                 236 226 207
Other (Income) Expense                 1 4 6
Amortization of Purchased Intangibles                 13 16 19
Segment Underwriting Income Loss and Net Investment Income Loss                 378 177 614
North America Agricultural Insurance                      
Segment Reporting Information [Line Items]                      
Net premiums written                 1,577 1,516 1,328
Net premiums earned                 1,569 1,508 1,316
Losses and loss expenses                 1,111 1,036 893
Policy benefits                 0 0 0
Policy Acquisition Costs                 79 81 83
Administrative expenses                 (9) (8) (6)
Underwriting income (loss)                 388 399 346
Net Investment Income                 28 25 20
Other (Income) Expense                 2 2 1
Amortization of Purchased Intangibles                 28 29 29
Segment Underwriting Income Loss and Net Investment Income Loss                 386 393 336
Segment Income Loss Including Gains Losses On Crop Derivatives                 385    
Derivative, Gain (Loss) on Derivative, Net                 3    
Overseas General Insurance                      
Segment Reporting Information [Line Items]                      
Net premiums written                 8,902 8,350 [2] 8,124
Net premiums earned                 8,612 8,131 8,132
Losses and loss expenses                 4,429 4,281 4,005
Policy benefits                 0 0 0
Policy Acquisition Costs                 2,346 2,221 2,136
Administrative expenses                 1,014 982 1,057
Underwriting income (loss)                 823 647 934
Net Investment Income                 619 610 600
Other (Income) Expense                 0 (4) (11)
Amortization of Purchased Intangibles                 41 45 48
Segment Underwriting Income Loss and Net Investment Income Loss                 1,401 1,216 1,497
Global Reinsurance                      
Segment Reporting Information [Line Items]                      
Net premiums written                 671 685 676
Net premiums earned                 670 704 710
Losses and loss expenses                 479 561 325
Policy benefits                 0 0 0
Policy Acquisition Costs                 162 177 187
Administrative expenses                 41 44 52
Underwriting income (loss)                 (12) (78) 146
Net Investment Income                 257 273 263
Other (Income) Expense                 (32) (1) (4)
Amortization of Purchased Intangibles                 0 0 0
Segment Underwriting Income Loss and Net Investment Income Loss                 277 196 413
Life Insurance                      
Segment Reporting Information [Line Items]                      
Net premiums written                 2,270 2,141 2,124
Net premiums earned                 2,218 2,101 2,055
Losses and loss expenses                 766 739 663
Policy benefits                 590 676 588
Policy Acquisition Costs                 557 530 509
Administrative expenses                 310 303 307
Underwriting income (loss)                 (5) (147) (12)
Net Investment Income                 341 313 283
Other (Income) Expense                 26 (84) 5
Amortization of Purchased Intangibles                 2 2 3
Segment Underwriting Income Loss and Net Investment Income Loss                 308 248 263
Management underwriting income loss Insurance                 298    
(Gains) losses from fair value changes in separate account assets                 38    
Corporate and Other                      
Segment Reporting Information [Line Items]                      
Net premiums written                 0 0 0
Net premiums earned                 0 0 0
Losses and loss expenses                 53 285 169
Policy benefits                 0 0 0
Policy Acquisition Costs                 0 0 0
Administrative expenses                 295 267 183
Underwriting income (loss)                 (348) (552) (352)
Net Investment Income                 (209) (283) (368)
Other (Income) Expense                 (406) (318) (217)
Amortization of Purchased Intangibles                 255 168 (80)
Segment Underwriting Income Loss and Net Investment Income Loss                 (406) (685) (423)
Realized Gain (Loss) on Marketable Securities, Cost Method Investments, and Other Investments                   84 (145)
Net Realized Gain (Loss)                 (652)    
Interest expense                 641 607 605
Chubb integration expenses                 59 310 492
Income tax expense (benefit)                 695 (139) 815
Net income                 $ (2,453) $ (1,379) $ (2,480)
[1] Related to (gains) losses from fair value changes in separate account assets that do not qualify for separate account reporting under GAAP.
[2] For the Year Ended December 31, 2017 (in millions of U.S. dollars)North America Commercial P&C Insurance North America Personal P&C Insurance North America Agricultural Insurance Overseas General Insurance GlobalReinsurance Life Insurance Corporate ChubbConsolidatedNet premiums written$12,019 $4,533 $1,516 $8,350 $685 $2,141 $— $29,244Net premiums earned12,191 4,399 1,508 8,131 704 2,101 — 29,034Losses and loss expenses8,287 3,265 1,036 4,281 561 739 285 18,454Policy benefits— — — — — 676 — 676Policy acquisition costs1,873 899 81 2,221 177 530 — 5,781Administrative expenses981 264 (8) 982 44 303 267 2,833Underwriting income (loss)1,050 (29) 399 647 (78) (147) (552) 1,290Net investment income (loss)1,961 226 25 610 273 313 (283) 3,125Other (income) expense1 4 2 (4) (1) (84) (318) (400)Amortization expense of purchased intangibles— 16 29 45 — 2 168 260Segment income (loss)$3,010 $177 $393 $1,216 $196 $248 $(685) $4,555Net realized gains (losses) including OTTI 84 84Interest expense 607 607Chubb integration expense 310 310Income tax benefit (139) (139)Net income (loss) $(1,379) $3,861