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Note 3 - Operations and Segmentation - Summary of Freight and Other Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue from Contract with Customer, Excluding Assessed Tax	$ 6,007	$ 5,963	$ 12,038	$ 12,019
Bulk [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	1,721	1,757	3,538	3,654
Industrial [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	2,123	2,086	4,227	4,103
Premium [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	1,794	1,726	3,489	3,468
Cargo and Freight [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	5,638	5,569	11,254	11,225
Other Subsidiary Revenues [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	212	220	429	455
Accessorial Revenues [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	131	149	305	300
Other Miscellaneous Product and Service Revenues [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 26	$ 25	$ 50	$ 39

X

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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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