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Intangible Assets (Roll-forward of Goodwill by Business Segment) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |
Balance at beginning of period | $ 15,332 | $ 4,796
Foreign exchange revaluation and other | 209 | 22
Balance at end of period | 15,541 | 15,332
North America Commercial P&C Insurance |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 6,961 | 1,203
Foreign exchange revaluation and other | 15 | 44
Balance at end of period | 6,976 | 6,961
North American Personal P&C [Member] |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 2,235 | 196
Foreign exchange revaluation and other | 5 | 14
Balance at end of period | 2,240 | 2,235
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 | 4,817 | 2,078
Foreign exchange revaluation and other | 187 | (36)
Balance at end of period | 5,004 | 4,817
Global Reinsurance |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 365 | 365
Foreign exchange revaluation and other | 0 | 0
Balance at end of period | 365 | 365
Life Insurance |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 820 | 820
Foreign exchange revaluation and other | 2 | 0
Balance at end of period | $ 822 | 820
The Chubb Corporation [Member] |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 10,514
The Chubb Corporation [Member] | North America Commercial P&C Insurance |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 5,714
The Chubb Corporation [Member] | North American Personal P&C [Member] |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 2,025
The Chubb Corporation [Member] | North America Agricultural Insurance |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0
The Chubb Corporation [Member] | Overseas General Insurance |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 2,775
The Chubb Corporation [Member] | Global Reinsurance |  |
Goodwill [Roll Forward] |  |
Acquisition |  | 0
The Chubb Corporation [Member] | Life Insurance |  |
Goodwill [Roll Forward] |  |
Acquisition |  | $ 0

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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