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Segment Information (Net Premiums Earned For Segment By Product) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | $ 40,389 | $ 36,355 | $ 33,117
North America Commercial P&C Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 17,107 | 15,461 | 13,964
North America Commercial P&C Insurance [Member] | Property and other short-tail [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 3,383 | 2,942 | 2,423
North America Commercial P&C Insurance [Member] | Casualty and all other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 13,056 | 11,905 | 10,812
North America Commercial P&C Insurance [Member] | Accident and Health [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 668 | 614 | 729
North America Personal P&C Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 5,180 | 4,915 | 4,866
North America Personal P&C Insurance [Member] | Personal automobile [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 811 | 781 | 822
North America Personal P&C Insurance [Member] | Personal homeowners [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 3,557 | 3,384 | 3,327
North America Personal P&C Insurance [Member] | Personal other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 812 | 750 | 717
North America Agricultural Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 2,838 | 2,338 | 1,822
Overseas General Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 10,803 | 10,441 | 9,285
Overseas General Insurance [Member] | Property and other short-tail [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 3,382 | 3,105 | 2,468
Overseas General Insurance [Member] | Casualty and all other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 3,232 | 3,114 | 2,738
Overseas General Insurance [Member] | Accident and Health [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 2,169 | 2,113 | 2,098
Overseas General Insurance [Member] | Personal lines [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 2,020 | 2,109 | 1,981
Global Reinsurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 922 | 798 | 698
Global Reinsurance [Member] | Property and other short-tail [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 211 | 151 | 104
Global Reinsurance [Member] | Casualty and all other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 503 | 457 | 421
Global Reinsurance [Member] | Property catastrophe [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 208 | 190 | 173
Life Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 3,539 | 2,402 | 2,482
Life Insurance [Member] | Accident and Health [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 2,055 | 1,082 | 1,165
Life Insurance [Member] | Life [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | $ 1,484 | $ 1,320 | $ 1,317

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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 https://asc.fasb.org/extlink&oid=120400993&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 https://asc.fasb.org/extlink&oid=120401096&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 https://asc.fasb.org/extlink&oid=120399700&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 https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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