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Shareholders' equity note (Tables) | 12 Months Ended
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Dec. 31, 2020
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):
| Year Ended December 31
|  |  | 2020 |  |  |  | 2019 |  |  |  | 2018
| CHF |  | USD |  | CHF |  | USD |  | CHF |  | USD
Total dividend distributions per common share | 2.89 |  |  | $ | 3.09 |  |  | 2.94 |  |  | $ | 2.98 |  |  | 2.84 |  |  | $ | 2.90 |
Schedule of changes in Common Shares issued and outstanding |
| Year Ended December 31
| 2020 |  | 2019 |  | 2018
Common Shares authorized and issued, beginning of year | 479,783,864 |  |  | 479,783,864 |  |  | 479,783,864 |
Cancellation of treasury shares | (2,178,600) |  |  | — |  |  | — |
Common Shares authorized and issued, end of year | 477,605,264 |  |  | 479,783,864 |  |  | 479,783,864 |
Common Shares in treasury, beginning of year (at cost) | (27,812,297) |  |  | (20,580,486) |  |  | (15,950,685) |
Net shares issued under employee share-based compensation plans | 2,345,208 |  |  | 3,210,427 |  |  | 3,089,234 |
Shares repurchased | (3,584,150) |  |  | (10,442,238) |  |  | (7,719,035) |
Cancellation of treasury shares | 2,178,600 |  |  | — |  |  | — |
Common Shares in treasury, end of year (at cost) | (26,872,639) |  |  | (27,812,297) |  |  | (20,580,486) |
Common Shares outstanding, end of year | 450,732,625 |  |  | 451,971,567 |  |  | 459,203,378 |
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:
| Year Ended December 31 |  | January 1, 2021 through
(in millions of U.S. dollars, except share data) | 2020 |  | 2019 |  | 2018 |  | February 24, 2021
Number of shares repurchased | 3,584,150 |  |  | 10,442,238 |  |  | 7,719,035 |  |  | 1,971,000 |
Cost of shares repurchased (1) | $ | 516 |  |  | $ | 1,531 |  |  | $ | 1,021 |  |  | $ | 327 |

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