Selected Quarterly Data (Unaudited)

12 Months Ended

Dec. 31, 2019

Selected Quarterly Data (Unaudited) [Abstract]

Selected Quarterly Data (Unaudited)

21. Selected Quarterly Data (Unaudited)

Millions, Except Per Share Amounts
2019	Mar. 31		Jun. 30		Sep. 30		Dec. 31
Operating revenues	$	5,384	$	5,596	$	5,516	$	5,212
Operating income		1,960		2,260		2,234		2,100
Net income		1,391		1,570		1,555		1,403
Net income per share:
Basic		1.94		2.23		2.22		2.03
Diluted		1.93		2.22		2.22		2.02

Millions, Except Per Share Amounts
2018	Mar. 31		Jun. 30		Sep. 30		Dec. 31
Operating revenues	$	5,475	$	5,672	$	5,928	$	5,757
Operating income		1,939		2,099		2,269		2,210
Net income		1,310		1,509		1,593		1,554
Net income per share:
Basic		1.69		1.98		2.16		2.13
Diluted		1.68		1.98		2.15		2.12

Per share net income for the four quarters combined may not equal the per share net income for the year due to rounding.