Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Computation of Income Per Share from Continuing Operations

The computation of net income per share was as follows:

In millions except per share amounts	2017		2016		2015
Net Income	$	1,687	$	2,035	$	1,899
Net income per share—Basic:
Weighted-average common shares	344.1		355.0		367.9
Net income per share—Basic	$	4.90	$	5.73	$	5.16
Net income per share—Diluted:
Weighted-average common shares	344.1		355.0		367.9
Effect of dilutive stock options and restricted stock units	2.7		2.1		2.2
Weighted-average common shares assuming dilution	346.8		357.1		370.1
Net income per share—Diluted	$	4.86	$	5.70	$	5.13