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Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
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 |  |  | Six Months Ended |
| June 30 |  |  | June 30 |
| 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
CHF |  |  | USD |  |  | CHF |  |  | USD |  |  | CHF |  |  | USD |  |  | CHF |  |  | USD |
Total dividend distributions per common share | 0.75 |  |  | $ | 0.75 |  |  | 0.73 |  |  | $ | 0.73 |  |  | 1.47 |  |  | $ | 1.48 |  |  | 1.39 |  |  | $ | 1.44 |
Share Repurchase Program [Table Text Block] | The following table presents repurchases of Chubb's Common Shares conducted in a series of open market transactions under the Board authorizations:
| Three Months Ended June 30 |  |  | Six Months Ended June 30 |  |  | July 1, 2019 through July 30, 2019 |
(in millions of U.S. dollars, except share data) | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |  |
Number of shares repurchased | 2,584,466 |  |  | 2,443,855 |  |  | 5,338,220 |  |  | 2,443,855 |  |  | 730,417 |
Cost of shares repurchased | $ | 376 |  |  | $ | 324 |  |  | $ | 743 |  |  | $ | 324 |  |  | $ | 110 |
Repurchase authorization remaining at end of period | $ | 736 |  |  | $ | 676 |  |  | $ | 736 |  |  | $ | 676 |  |  | $ | 626 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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