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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
Stockholders' Equity Note [Abstract] |
Dividends Declared | 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
| 2021 |  | 2020 |  | 2021 |  | 2020
CHF |  | USD |  | CHF |  | USD |  | CHF |  | USD |  | CHF |  | USD
Total dividend distributions per common share | 0.73 |  |  | $ | 0.80 |  |  | 0.71 |  |  | $ | 0.78 |  |  | 2.14 |  |  | $ | 2.38 |  |  | 2.18 |  |  | $ | 2.31 |
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 |  | Nine Months Ended |  | October 1, 2021 through October 27, 2021
|  |  | September 30 |  |  |  | September 30 |
(in millions of U.S. dollars, except share data) | 2021 |  | 2020 |  | 2021 |  | 2020 |
Number of shares repurchased | 8,412,000 |  |  | — |  |  | 22,877,400 |  |  | 2,266,150 |  |  | 167,700 |
Cost of shares repurchased | $ | 1,516 |  |  | $ | — |  |  | $ | 3,956 |  |  | $ | 326 |  |  | $ | 29 |
Repurchase authorization remaining at end of period | $ | 3,551 |  |  | $ | 1,124 |  |  | $ | 3,551 |  |  | $ | 1,124 |  |  | $ | 3,522 |

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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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