Income Per Share from Continuing Operations (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Computation of Income Per Share from Continuing Operations

The computation of income per share from continuing operations was as follows:

In millions except per share amounts	2016		2015		2014
Income from continuing operations	$	2,035	$	1,899	$	1,890
Income per share from continuing operations—Basic:
Weighted-average common shares	355.0		367.9		401.7
Income per share from continuing operations—Basic	$	5.73	$	5.16	$	4.70
Income per share from continuing operations—Diluted:
Weighted-average common shares	355.0		367.9		401.7
Effect of dilutive stock options and restricted stock units	2.1		2.2		2.9
Weighted-average common shares assuming dilution	357.1		370.1		404.6
Income per share from continuing operations—Diluted	$	5.70	$	5.13	$	4.67