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Shareholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2021
Stockholders' Equity Note [Abstract] |
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 |  |  |  | April 1, 2021 through April 29, 2021
|  |  | March 31 |  |  |  |  |
(in millions of U.S. dollars, except share data) | 2021 |  | 2020 |  |  |  |  |
Number of shares repurchased | 3,110,000 |  |  | 2,266,150 |  |  |  |  |  |  | 450,000 |
Cost of shares repurchased | $ | 519 |  |  | $ | 326 |  |  |  |  |  |  | $ | 76 |
Repurchase authorization remaining at end of period | $ | 1,982 |  |  | $ | 1,124 |  |  |  |  |  |  | $ | 1,906 |

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