Net Income Per Common Share (Tables)

12 Months Ended

Dec. 31, 2017

Basic And Diluted Net Income Per Common Share

Basic and diluted net income per common share are presented in the following table.



(in millions, except per share data)
Years Ended December 31	2017		2016		2015
Basic and diluted
Net income	$	743	$	477	$	521
Less income allocated to participating securities	5		4		6
Net income attributable to common shares	$	738	$	473	$	515

Basic average common shares	174		172		176

Basic net income per common share	$	4.23	$	2.74	$	2.93

Basic average common shares	174		172		176
Dilutive common stock equivalents:
Net effect of the assumed exercise of stock options	3		2		2
Net effect of the assumed exercise of warrants	1		3		3
Diluted average common shares	178		177		181

Diluted net income per common share	$	4.14	$	2.68	$	2.84

Schedule of Average Shares Excluded From Diluted Net Income Per Common Share Computation

The following average shares related to outstanding options to purchase shares of common stock were not included in the computation of diluted net income per common share because the options were anti-dilutive for the period. There were no anti-dilutive options for the year ended December 31, 2017.



(shares in millions)
Years Ended December 31	2016	2015
Average outstanding options	3.3	5.1
Range of exercise prices	$37.26 - $59.86	$46.68 - $60.82