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Share-based compensation (Rollforward Of Company's Stock Options) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Options, Weighted-Average Fair Value and Total Intrinsic Value [Abstract] |  |  |
Weighted-average fair value of stock options granted (US$ per share) | $ 29.71 | $ 22.97 | $ 21.52
Total intrinsic value of options exercised | $ 71 | $ 111 | $ 99
Total intrinsic value of options outstanding | 274 |  |
Total intrinsic value of options exercisable | $ 268 |  |
Number of Options [Roll Forward] |  |  |
Number of option outstanding, beginning of period | 10,433,316 | 10,180,720 | 9,853,496
Number of options granted | 1,842,690 | 2,079,522 | 1,929,616
Number of options exercised | (1,065,384) | (1,632,629) | (1,728,949)
Number of options forfeited | (202,900) | (194,297) | (213,339)
Number of option outstanding, end of period | 11,007,722 | 10,433,316 | 10,180,720
Number of options exercisable | 7,405,354 |  |
Weighted-Average Exercise Price [Roll Forward] |  |  |
Weighted-average exercise price of options outstanding, beginning of period (US$ oer share) | $ 99.20 | $ 87.29 | $ 78.40
Weighted-average exercise price of options granted (US$ per share) | 143.07 | 139.00 | 118.39
Weighted-average exercise price of options exercised (US$ per share) | 73.57 | 73.53 | 66.65
Weighted average exercise price of options forfeited (US$ per share) | 133.92 | 119.44 | 110.01
Weighted-average exercise price of options outstanding, end of period (US$ oer share | 108.25 | $ 99.20 | 87.29
Weighted average exercise price of options exercisable (US$ per share) | $ 93.88 |  |
The Chubb Corporation [Member] |  |  |
Options, Weighted-Average Fair Value and Total Intrinsic Value [Abstract] |  |  |
Weighted-average fair value of stock options granted (US$ per share) |  |  | $ 36.07
Number of Options [Roll Forward] |  |  |
Number of options granted |  |  | 339,896
Weighted-Average Exercise Price [Roll Forward] |  |  |
Weighted-average exercise price of options granted (US$ per share) |  |  | $ 77.83

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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