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Shareholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2019
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 March 31 |  |  | April 1, 2019 through May 1, 2019 |
(in millions of U.S. dollars, except share data) | 2019 |  |  | 2018 |  |
Number of shares repurchased | 2,753,754 |  |  | — |  |  | 550,000 |
Cost of shares repurchased | $ | 367 |  |  | $ | — |  |  | $ | 77 |
Repurchase authorization remaining at end of period | $ | 1,112 |  |  | $ | 1,000 |  |  | $ | 1,035 |

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