Shareholders' equity Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2017

Stockholders' Equity Note [Abstract]

Share Repurchase Program [Table Text Block]

Repurchases of Chubb's Common Shares conducted in a series of open market transactions from January 1, 2017 through May 3, 2017 under the Board authorization are as follows:

(in millions of U.S. dollars, except share data)	Three Months Ended March 31, 2017		April 1, 2017 through May 3, 2017
Number of shares repurchased	1,036,064		664,301
Cost of shares repurchased	$	140	$	91
Repurchase authorization remaining at end of period	$	860	$	769