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Shareholders' equity Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2017
Stockholders' Equity Note [Abstract] |
Dividends Declared [Table Text Block] | The following table presents dividend distributions per Common Share in Swiss francs (CHF) and U.S. dollars (USD):
| Three Months Ended |  |  | Nine Months Ended |
| September 30 |  |  | September 30 |
| 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
CHF |  |  | USD |  |  | CHF |  |  | USD |  |  | CHF |  |  | USD |  |  | CHF |  |  | USD |
Total dividend distributions per common share | 0.68 |  |  | $ | 0.71 |  |  | 0.67 |  |  | $ | 0.69 |  |  | 2.06 |  |  | $ | 2.11 |  |  | 2.01 |  |  | $ | 2.05 |
Share Repurchase Program [Table Text Block] | Repurchases of Chubb's Common Shares conducted in a series of open market transactions from January 1, 2017 through October 31, 2017 under the Board authorization are as follows:
(in millions of U.S. dollars, except share data) | Three Months Ended September 30, 2017 |  |  | Nine Months Ended September 30, 2017 |  |  | October 1, 2017 through October 31, 2017 |
Number of shares repurchased | 1,615,383 |  |  | 5,033,013 |  |  | 25,000 |
Cost of shares repurchased | $ | 232 |  |  | $ | 707 |  |  | $ | 4 |
Repurchase authorization remaining at end of period | $ | 293 |  |  | $ | 293 |  |  | $ | 289 |

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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 + Details
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