Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Summary of Computation of Net Income Per Share

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