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Note 11 - Properties - Schedule of Property and Equipment Major Categories (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020
Property, Plant and Equipment, Cost		$ 77,275		$ 75,420
Properties, net (Note 11)		54,871		54,161
Property, Plant and Equipment, Accumulated Depreciation		22,404		21,259
Land [Member]
Property, Plant and Equipment, Cost		5,339		5,246
Properties, net (Note 11)		5,339		5,246
Roadrail and Other Track Material [Member]
Property, Plant and Equipment, Cost		17,980		17,620
Properties, net (Note 11)		11,136		10,989
Property, Plant and Equipment, Accumulated Depreciation		$ 6,844		$ 6,631
Property, Plant and Equipment, Useful Life (Year)		44 years		42 years
Road Ties [Member]
Property, Plant and Equipment, Cost		$ 11,364		$ 11,051
Properties, net (Note 11)		7,848		7,720
Property, Plant and Equipment, Accumulated Depreciation		$ 3,516		$ 3,331
Property, Plant and Equipment, Useful Life (Year)		34 years		34 years
Road Ballast [Member]
Property, Plant and Equipment, Cost		$ 6,070		$ 5,926
Properties, net (Note 11)		4,218		4,173
Property, Plant and Equipment, Accumulated Depreciation		$ 1,852		$ 1,753
Property, Plant and Equipment, Useful Life (Year)		34 years		34 years
Road, Other [Member]
Property, Plant and Equipment, Cost	[1]	$ 21,593		$ 21,030
Properties, net (Note 11)		16,936	[1]	16,701
Property, Plant and Equipment, Accumulated Depreciation		$ 4,657	[1]	$ 4,329
Property, Plant and Equipment, Useful Life (Year)		47 years	[1]	48 years
Road [Member]
Property, Plant and Equipment, Cost		$ 57,007		$ 55,627
Properties, net (Note 11)		40,138		39,583
Property, Plant and Equipment, Accumulated Depreciation		16,869		16,044
Equipment, Locomotives [Member]
Property, Plant and Equipment, Cost		9,371		9,375
Properties, net (Note 11)		5,592		5,820
Property, Plant and Equipment, Accumulated Depreciation		$ 3,779		$ 3,555
Property, Plant and Equipment, Useful Life (Year)		17 years		17 years
Equipment, Freight Cars [Member]
Property, Plant and Equipment, Cost		$ 2,227		$ 2,118
Properties, net (Note 11)		1,405		1,329
Property, Plant and Equipment, Accumulated Depreciation		$ 822		$ 789
Property, Plant and Equipment, Useful Life (Year)		24 years		25 years
Equipment, Work Equipment and Other [Member]
Property, Plant and Equipment, Cost		$ 1,161		$ 1,107
Properties, net (Note 11)		750		756
Property, Plant and Equipment, Accumulated Depreciation		$ 411		$ 351
Property, Plant and Equipment, Useful Life (Year)		18 years		18 years
Equipment [Member]
Property, Plant and Equipment, Cost		$ 12,759		$ 12,600
Properties, net (Note 11)		7,747		7,905
Property, Plant and Equipment, Accumulated Depreciation		5,012		4,695
Technology Equipment [Member]
Property, Plant and Equipment, Cost		1,209		1,199
Properties, net (Note 11)		686		679
Property, Plant and Equipment, Accumulated Depreciation		$ 523		$ 520
Property, Plant and Equipment, Useful Life (Year)		12 years		13 years
Construction in Progress [Member]
Property, Plant and Equipment, Cost		$ 961		$ 748
Properties, net (Note 11)		961		748
Property, Plant and Equipment, Accumulated Depreciation		$ 0		$ 0
[1] Other roadway includes grading, bridges and tunnels, signals, buildings, and other road assets.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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