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Note 1 - Nature of Operations - Summary of Freight and Other Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer, Excluding Assessed Tax, Total	$ 21,804	$ 19,533	$ 21,708
Bulk [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total	6,656	5,960	6,529
Industrial [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total	7,323	6,622	7,472
Premium [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total	6,265	5,669	6,242
Cargo and Freight [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total	20,244	18,251	20,243
Other Subsidiary Revenues [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total	741	743	880
Accessorial Revenues [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total	752	473	514
Other Miscellaneous Product and Service Revenues [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total	$ 67	$ 66	$ 71

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.

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