Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2019

Stockholders' Equity Note [Abstract]

Activities Under Share Repurchase Program

The following table describes activities under the share repurchase program:

	For the three months ended June 30				For the six months ended June 30
	2019		2018		2019		2018
Number of Common Shares repurchased(1)	956,243		1,060,262		1,663,921		2,495,962
Weighted-average price per share(2)	$	308.84	$	226.97	$	288.80	$	223.97
Amount of repurchase (in millions)(2)	$	296	$	241	$	481	$	559

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

⁽²⁾ Includes brokerage fees.