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Intangible Assets (Roll-forward of Goodwill by Business Segment) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Roll Forward] |  |
Balance at beginning of period | $ 15,400 | $ 15,296
Foreign exchange revaluation and other | (187) | 60
Balance at end of period | 15,213 | 15,400
North America Commercial P&C Insurance |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 6,972 | 6,955
Foreign exchange revaluation and other | 0 | 17
Balance at end of period | 6,972 | 6,972
North America Personal P&C Insurance [Member] |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 2,240 | 2,234
Foreign exchange revaluation and other | 0 | 6
Balance at end of period | 2,240 | 2,240
North America Agricultural Insurance [Member] |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 134 | 134
Foreign exchange revaluation and other | 0 | 0
Balance at end of period | 134 | 134
Overseas General Insurance [Member] |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 4,836 | 4,785
Foreign exchange revaluation and other | (183) | 35
Balance at end of period | 4,653 | 4,836
Global Reinsurance [Member] |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 371 | 371
Foreign exchange revaluation and other | 0 | 0
Balance at end of period | 371 | 371
Life Insurance [Member] |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 847 | 817
Foreign exchange revaluation and other | (4) | 2
Balance at end of period | $ 843 | 847
Banchile Seguros de Vida [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, Acquired During Period |  | 44
Banchile Seguros de Vida [Member] | North America Commercial P&C Insurance |  |
Goodwill [Roll Forward] |  |
Goodwill, Acquired During Period |  | 0
Banchile Seguros de Vida [Member] | North America Agricultural Insurance [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, Acquired During Period |  | 0
Banchile Seguros de Vida [Member] | Overseas General Insurance [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, Acquired During Period |  | 16
Banchile Seguros de Vida [Member] | Global Reinsurance [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, Acquired During Period |  | 0
Banchile Seguros de Vida [Member] | Life Insurance [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, Acquired During Period |  | 28
Banchile Seguros de Vida [Member] | North America Personal P&C Insurance [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, Acquired During Period |  | $ 0

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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