Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Earnings per share reconciliation

The following table provides a reconciliation between basic and diluted earnings per share:

In millions, except per share data	Year ended December 31,	2020		2019		2018
Net income		$	3,562	$	4,216	$	4,328
Weighted-average basic shares outstanding		711.3		720.1		734.5
Dilutive effect of stock-based compensation		1.7		2.5		3.2
Weighted-average diluted shares outstanding		713.0		722.6		737.7
Basic earnings per share		$	5.01	$	5.85	$	5.89
Diluted earnings per share		$	5.00	$	5.83	$	5.87
Units excluded from the calculation as their inclusion would not have a dilutive effect
Stock options		0.7		0.5		0.6
Performance share units		0.3		0.2		0.3