Quarterly Financial Data - Unaudited (Tables)

12 Months Ended

Dec. 31, 2020

Quaterly Financial Data Unaudited [Abstract]

Schedule of Quarterly Financial Information

In millions

2020	Fourth		Third		Second		First
Revenues	$	5,674	$	5,176	$	4,602	$	5,417
Operating income	$	2,176	$	2,011	$	1,730	$	1,823
Net income	$	1,493	$	1,347	$	1,131	$	1,190

2019	Fourth		Third		Second		First
Revenues	$	5,839	$	6,021	$	5,893	$	5,762
Operating income	$	2,105	$	2,180	$	2,007	$	1,779
Net income	$	1,424	$	1,466	$	1,338	$	1,253