Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Operating revenues:
Operating revenues	$ 6,091	$ 5,941	$ 18,129	$ 17,960
Operating expenses:
Compensation and benefits	1,228	1,201	3,638	3,649
Purchased services and materials	644	668	1,901	1,971
Fuel	610	702	1,893	2,132
Depreciation	602	580	1,792	1,729
Equipment and other rents	237	235	672	718
Other	354	378	1,045	1,086
Total operating expenses	3,675	3,764	10,941	11,285
Operating income	2,416	2,177	7,188	6,675
Other income, net (Note 6)	87	106	282	383
Interest expense	(314)	(334)	(957)	(1,009)
Income before income taxes	2,189	1,949	6,513	6,049
Income tax expense (Note 7)	(518)	(421)	(1,528)	(1,322)
Net income	$ 1,671	$ 1,528	$ 4,985	$ 4,727
Share and per share (Note 8):
Earnings per share - basic (in dollars per share)	$ 2.75	$ 2.51	$ 8.19	$ 7.76
Earnings per share - diluted (in dollars per share)	$ 2.75	$ 2.51	$ 8.18	$ 7.75
Weighted average number of shares - basic (in shares)	607.6	608.7	608.7	609.3
Weighted average number of shares - diluted (in shares)	608.6	609.8	609.7	610.3
Cargo and Freight [Member]
Operating revenues:
Operating revenues	$ 5,768	$ 5,545	$ 17,022	$ 16,770
Product and Service, Other [Member]
Operating revenues:
Operating revenues	$ 323	$ 396	$ 1,107	$ 1,190