CONSOLIDATED INCOME STATEMENTS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenue	$ 14,853	$ 12,522	$ 10,583
Expense
Labor and Fringe	2,861	2,550	2,275
Purchased Services and Other	2,685	2,135	1,719
Fuel	1,626	913	541
Depreciation and Amortization	1,500	1,420	1,383
Equipment and Other Rents	396	364	338
Gains on Property Dispositions	(238)	(454)	(35)
Total Expense	8,830	6,928	6,221
Operating Income	6,023	5,594	4,362
Interest Expense	(742)	(722)	(754)
Other Income - Net (Note 14)	133	79	19
Earnings Before Income Taxes	5,414	4,951	3,627
Income Tax Expense (Note 12)	(1,248)	(1,170)	(862)
Net Earnings	$ 4,166	$ 3,781	$ 2,765
Net Earnings Per Share
Basic (in dollars per share)	$ 1.95	$ 1.68	$ 1.20
Assuming Dilution (in dollars per share)	$ 1.95	$ 1.68	$ 1.20
Average Common Shares Outstanding (Millions)
Basic (shares)	2,136	2,250	2,300
Assuming Dilution (shares)	2,141	2,255	2,305