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Note 6 - Other Income (Details Textual) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Gain (Loss) on Disposition of Assets, Total	[1]	$ 98	$ 115	$ 20
Land [Member]
Gain (Loss) on Disposition of Assets, Total		$ 50	$ 69
[1] 2021 includes a $50 million gain from a sale to the Colorado Department of Transportation. 2020 includes a $69 million gain from a land and permanent easement sale to the Illinois State Toll Highway Authority.

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- Definition

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

+ Details

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Balance Type:	credit
Period Type:	duration

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- Details

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Data Type:	na
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Period Type: