Net Income Per Share

12 Months Ended

Dec. 31, 2019

Net income per basic share is computed by dividing net income by the weighted-average number of shares outstanding for the period. Net income per diluted share is computed by dividing net income by the weighted-average number of shares assuming dilution for stock options and restricted stock units. Dilutive shares reflect the potential additional shares that would be outstanding if the dilutive stock options outstanding were exercised and the unvested restricted stock units vested during the period. The computation of net income per share for the twelve months ended December 31, 2019, 2018 and 2017 was as follows:



In millions except per share amounts	2019		2018		2017
Net Income	$	2,521	$	2,563	$	1,687
Net income per share—Basic:
Weighted-average common shares	323.9		335.0		344.1
Net income per share—Basic	$	7.78	$	7.65	$	4.90
Net income per share—Diluted:
Weighted-average common shares	323.9		335.0		344.1
Effect of dilutive stock options and restricted stock units	1.7		2.1		2.7
Weighted-average common shares assuming dilution	325.6		337.1		346.8
Net income per share—Diluted	$	7.74	$	7.60	$	4.86

Options that were considered antidilutive were not included in the computation of diluted net income per share. There were 0.9 million and 0.5 million antidilutive options outstanding as of December 31, 2019 and 2018, respectively. There were no antidilutive options outstanding as of December 31, 2017.