Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating revenues:
Operating revenues	$ 6,031	$ 6,056
Operating expenses:
Compensation and benefits	1,223	1,179
Fuel	658	766
Purchased services and materials	613	653
Depreciation	594	572
Equipment and other rents	216	235
Other	355	357
Total operating expenses	3,659	3,762
Operating income	2,372	2,294
Other income, net (Note 6)	92	184
Interest expense	(324)	(336)
Income before income taxes	2,140	2,142
Income tax expense	(499)	(512)
Net income	$ 1,641	$ 1,630
Share and Per Share (Note 7):
Earnings per share - basic (in dollars per share)	$ 2.69	$ 2.67
Earnings per share - diluted (in dollars per share)	$ 2.69	$ 2.67
Weighted average number of shares - basic (in shares)	609.2	610.6
Weighted average number of shares - diluted (in shares)	610.2	611.5
Cargo and Freight [Member]
Operating revenues:
Operating revenues	$ 5,616	$ 5,656
Product and Service, Other [Member]
Operating revenues:
Operating revenues	$ 415	$ 400