Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2017

Equity [Abstract]

Activities Under Share Repurchase Program

The following table provides activities under the share repurchase program:

	For the three months ended June 30				For the six months ended June 30
	2017		2016		2017		2016
Number of Common Shares repurchased(1)	682,900		5,127,800		682,900		5,127,800
Weighted-average price per share(2)	$	208.75	$	169.13	$	208.75	$	169.13
Amount of repurchase (in millions)(2)	$	143	$	867	$	143	$	867

⁽¹⁾ Includes shares repurchased but not yet canceled at quarter end.

⁽²⁾ Includes brokerage fees.