Consolidated Statements Of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating revenues:
Total operating revenues	$ 21,708	$ 22,832	$ 21,240
Operating expenses:
Compensation and benefits	4,533	5,056	4,939
Purchased services and materials	2,254	2,443	2,363
Depreciation	2,216	2,191	2,105
Fuel	2,107	2,531	1,891
Equipment and other rents	984	1,072	888
Other	1,060	1,022	948
Total operating expenses	13,154	14,315	13,134
Operating income	8,554	8,517	8,106
Other income (Note 7)	243	94	245
Interest expense	(1,050)	(870)	(719)
Income before income taxes	7,747	7,741	7,632
Income taxes (Note 8)	(1,828)	(1,775)	3,080
Net income	$ 5,919	$ 5,966	$ 10,712
Share and Per Share (Note 9):
Earnings per share - basic	$ 8.41	$ 7.95	$ 13.42
Earnings per share - diluted	$ 8.38	$ 7.91	$ 13.36
Weighted average number of shares - basic	703.5	750.9	798.4
Weighted average number of shares - diluted	706.1	754.3	801.7
Cargo and Freight [Member]
Operating revenues:
Revenue from contract with customer excluding assessed tax	$ 20,243	$ 21,384	$ 19,837
Other [Member]
Operating revenues:
Revenue from contract with customer excluding assessed tax	$ 1,465	$ 1,448	$ 1,403