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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Activities Under Share Repurchase Program The following table provides activities under the share repurchase program:

For the three months ended September 30

For the nine months ended September 30

2017

2016

2017

2016
Number of Common Shares repurchased
1,145,400

 
1,782,200

 
1,828,300

 
6,910,000

Weighted-average price per share(1)
$
196.46

 
$
192.10

 
$
201.50

 
$
175.08

Amount of repurchase (in millions)(1)
$
225

 
$
342

 
$
368

 
$
1,210

(1) Includes brokerage fees.