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Shareholders' equity (Tables) | 12 Months Ended
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Dec. 31, 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):
| Year Ended December 31 |
|  |  | 2019 |  |  |  |  | 2018 |  |  |  |  | 2017 |
| CHF |  |  | USD |  |  | CHF |  |  | USD |  |  | CHF |  |  | USD |
Total dividend distributions per common share | 2.94 |  |  | $ | 2.98 |  |  | 2.84 |  |  | $ | 2.90 |  |  | 2.76 |  |  | $ | 2.82 |
Schedule of changes in Common Shares issued and outstanding |
| Year Ended December 31 |
| 2019 |  |  | 2018 |  |  | 2017 |
Shares issued, beginning and end of year | 479,783,864 |  |  | 479,783,864 |  |  | 479,783,864 |
Common Shares in treasury, beginning of year (at cost) | (20,580,486 | ) |  | (15,950,685 | ) |  | (13,815,148 | )
Net shares issued under employee share-based compensation plans | 3,210,427 |  |  | 3,089,234 |  |  | 3,731,075 |
Shares repurchased | (10,442,238 | ) |  | (7,719,035 | ) |  | (5,866,612 | )
Common Shares in treasury, end of year (at cost) | (27,812,297 | ) |  | (20,580,486 | ) |  | (15,950,685 | )
Shares issued and outstanding, end of year | 451,971,567 |  |  | 459,203,378 |  |  | 463,833,179 |
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, 2020 through |
(in millions of U.S. dollars, except share data) | 2019 |  |  | 2018 |  |  | 2017 |  |  | February 26, 2020 |
Number of shares repurchased | 10,442,238 |  |  | 7,719,035 |  |  | 5,866,612 |  |  | 947,400 |
Cost of shares repurchased | $ | 1,531 |  |  | $ | 1,021 |  |  | $ | 830 |  |  | $ | 151 |

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