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Segment Information (Net Premiums Earned For Segment By Product) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | $ 45,712 | $ 40,360 | $ 36,292
North America Commercial P&C Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 18,416 | 17,107 | 15,461
North America Commercial P&C Insurance [Member] | Property and other short-tail [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 3,985 | 3,383 | 2,942
North America Commercial P&C Insurance [Member] | Casualty and all other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 13,764 | 13,056 | 11,905
North America Commercial P&C Insurance [Member] | Accident and Health [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 667 | 668 | 614
North America Personal P&C Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 5,536 | 5,180 | 4,915
North America Personal P&C Insurance [Member] | Personal automobile [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 859 | 811 | 781
North America Personal P&C Insurance [Member] | Personal homeowners [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 3,833 | 3,557 | 3,384
North America Personal P&C Insurance [Member] | Insurance, Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 844 | 812 | 750
North America Agricultural Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 3,169 | 2,838 | 2,338
Overseas General Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 12,231 | 10,803 | 10,441
Overseas General Insurance [Member] | Property and other short-tail [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 3,831 | 3,382 | 3,105
Overseas General Insurance [Member] | Casualty and all other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 3,526 | 3,232 | 3,114
Overseas General Insurance [Member] | Accident and Health [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 2,469 | 2,169 | 2,113
Overseas General Insurance [Member] | Personal lines [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 2,405 | 2,020 | 2,109
Global Reinsurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 962 | 922 | 798
Global Reinsurance [Member] | Property and other short-tail [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 331 | 211 | 151
Global Reinsurance [Member] | Casualty and all other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 472 | 503 | 457
Global Reinsurance [Member] | Property catastrophe [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 159 | 208 | 190
Life Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 5,398 | 3,510 | 2,339
Life Insurance [Member] | Accident and Health [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 3,097 | 2,055 | 1,082
Life Insurance [Member] | Life [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | $ 2,301 | $ 1,455 | $ 1,257

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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 -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479655/944-605-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -SubTopic 220 -Topic 942 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -SubTopic 220 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 + Details
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