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Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2020
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
 
(in millions of U.S. dollars, except share data)
2020

 
2019

Number of shares repurchased
2,266,150

 
2,753,754

Cost of shares repurchased
$
326

 
$
367

Repurchase authorization remaining at end of period
$
1,124

 
$
1,112