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Intangible Assets (Roll-forward of Goodwill by Business Segment) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |
Balance at beginning of period | $ 15,541 | $ 15,332
Foreign exchange revaluation and other | (270) | 209
Balance at end of period | 15,271 | 15,541
North America Commercial P&C Insurance |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 6,976 | 6,961
Foreign exchange revaluation and other | (30) | 15
Balance at end of period | 6,946 | 6,976
North American Personal P&C [Member] |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 2,240 | 2,235
Foreign exchange revaluation and other | (10) | 5
Balance at end of period | 2,230 | 2,240
North America Agricultural Insurance |  |
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 |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 5,004 | 4,817
Foreign exchange revaluation and other | (234) | 187
Balance at end of period | 4,770 | 5,004
Global Reinsurance |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 365 | 365
Foreign exchange revaluation and other | 6 | 0
Balance at end of period | 371 | 365
Life Insurance |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 822 | 820
Foreign exchange revaluation and other | (2) | 2
Balance at end of period | $ 820 | $ 822

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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://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=77989000&loc=SL49117168-202975 Reference 2: 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 foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + 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 (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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