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Segment Information (Net Premiums Earned For Segment By Product) (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 earned | $ 7,465 | $ 7,908 | $ 7,664 | $ 7,027 | $ 7,218 | $ 7,807 | $ 7,237 | $ 6,772 | $ 30,064 | $ 29,034 |  | $ 28,749 |
North America Commercial P&C Insurance |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 12,402 | 12,191 |  | 12,217 |
North America Commercial P&C Insurance | Property and other short-tail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 1,861 | 1,899 |  | 1,963 |
North America Commercial P&C Insurance | Casualty and all other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 9,773 | 9,554 |  | 9,552 |
North America Commercial P&C Insurance | Accident and Health [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 768 | 738 |  | 702 |
North American Personal P&C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 4,593 | 4,399 |  | 4,319 |
North American Personal P&C [Member] | Automobiles [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 803 | 742 |  | 699 |
North American Personal P&C [Member] | Personal homeowner [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 3,127 | 3,014 |  | 3,007 |
North American Personal P&C [Member] | Other Insurance Product Line [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 663 | 643 |  | 613 |
North America Agricultural Insurance |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 1,569 | 1,508 |  | 1,316 |
Overseas General Insurance |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 8,612 | 8,131 |  | 8,132 |
Overseas General Insurance | Property and other short-tail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 2,134 | 2,076 | [1] | 2,133 | [1]
Overseas General Insurance | Casualty and all other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 2,429 | 2,266 | [1] | 2,177 | [1]
Overseas General Insurance | Accident and Health [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 2,265 | 2,180 |  | 2,196 |
Overseas General Insurance | Personal lines [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 1,784 | 1,609 |  | 1,626 |
Global Reinsurance |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 670 | 704 |  | 710 |
Global Reinsurance | Property and other short-tail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 123 | 132 |  | 118 |
Global Reinsurance | Casualty and all other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 377 | 374 |  | 407 |
Global Reinsurance | Property catastrophe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 170 | 198 |  | 185 |
Life Insurance |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 2,218 | 2,101 |  | 2,055 |
Life Insurance | Accident and Health [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 1,196 | 1,121 |  | 1,053 |
Life Insurance | Life Insurance Product Line [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | $ 1,022 | $ 980 |  | $ 1,002 |
[1] | For the Year Ended December 31 (in millions of U.S. dollars)2018 2017 2016North America Commercial P&C Insurance Property & other short-tail lines$1,861 $1,899 $1,963Casualty & all other9,773 9,554 9,552A&H768 738 702Total North America Commercial P&C Insurance12,402 12,191 12,217North America Personal P&C Insurance Personal automobile803 742 699Personal homeowners3,127 3,014 3,007Personal other663 643 613Total North America Personal P&C Insurance4,593 4,399 4,319North America Agricultural Insurance1,569 1,508 1,316Overseas General Insurance Property & other short-tail lines2,134 2,076 2,133Casualty & all other2,429 2,266 2,177Personal lines1,784 1,609 1,626A&H2,265 2,180 2,196Total Overseas General Insurance8,612 8,131 8,132Global Reinsurance Property & other short-tail lines123 132 118Property catastrophe170 198 185Casualty & all other377 374 407Total Global Reinsurance670 704 710Life Insurance Life1,022 980 1,002A&H1,196 1,121 1,053Total Life Insurance2,218 2,101 2,055Total net premiums earned$30,064 $29,034 $28,749

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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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