CONSOLIDATED INCOME STATEMENTS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenue	$ 11,937	$ 12,250	$ 11,408
Expense
Labor and Fringe	2,616	2,738	2,946
Materials, Supplies and Other	1,784	1,967	2,113
Depreciation	1,349	1,331	1,315
Fuel	906	1,046	864
Equipment and Other Rents	408	395	429
Restructuring Charge (Note 1)	0	0	240
Equity Earnings of Affiliates	(91)	(96)	(219)
Total Expense	6,972	7,381	7,688
Operating Income	4,965	4,869	3,720
Interest Expense	(737)	(639)	(546)
Restructuring Charge - Non-Operating (Note 1)	0	0	(85)
Other Income - Net (Note 14)	88	74	53
Earnings Before Income Taxes	4,316	4,304	3,142
Income Tax (Expense) Benefit (Note 12)	(985)	(995)	2,329
Net Earnings	$ 3,331	$ 3,309	$ 5,471
Net Earnings Per Share
Basic (in dollars per share)	$ 4.18	$ 3.86	$ 6.01
Assuming Dilution (in dollars per share)	$ 4.17	$ 3.84	$ 5.99
Average Common Shares Outstanding (Millions)
Basic (shares)	796	857	911
Assuming Dilution (shares)	798	861	914