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Note 1 - Nature of Operations - Summary of Freight and Other Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer, Excluding Assessed Tax	$ 24,875	$ 21,804	$ 19,533
Bulk [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	7,537	6,656	5,960
Industrial [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	8,205	7,323	6,622
Premium [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	7,417	6,265	5,669
Cargo and Freight [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	23,159	20,244	18,251
Other Subsidiary Revenues [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	884	741	743
Accessorial Revenues [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	779	752	473
Other Miscellaneous Product and Service Revenues [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 53	$ 67	$ 66

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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