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Note 11 - Properties - Schedule of Property and Equipment Major Categories (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021
Property, Plant and Equipment, Cost		$ 79,255		$ 77,275
Property, Plant and Equipment, Net		56,038		54,871
Property, Plant and Equipment, Accumulated Depreciation		23,217		22,404
Land [Member]
Property, Plant and Equipment, Cost		5,344		5,339
Property, Plant and Equipment, Net		5,344		5,339
Roadrail and Other Track Material [Member]
Property, Plant and Equipment, Cost		18,419		17,980
Property, Plant and Equipment, Net		11,323		11,136
Property, Plant and Equipment, Accumulated Depreciation		$ 7,096		$ 6,844
Property, Plant and Equipment, Useful Life (Year)		43 years		44 years
Road Ties [Member]
Property, Plant and Equipment, Cost		$ 11,676		$ 11,364
Property, Plant and Equipment, Net		7,977		7,848
Property, Plant and Equipment, Accumulated Depreciation		$ 3,699		$ 3,516
Property, Plant and Equipment, Useful Life (Year)		34 years		34 years
Road Ballast [Member]
Property, Plant and Equipment, Cost		$ 6,222		$ 6,070
Property, Plant and Equipment, Net		4,272		4,218
Property, Plant and Equipment, Accumulated Depreciation		$ 1,950		$ 1,852
Property, Plant and Equipment, Useful Life (Year)		34 years		34 years
Road, Other [Member]
Property, Plant and Equipment, Cost	[1]	$ 22,411		$ 21,593
Property, Plant and Equipment, Net		17,441	[1]	16,936
Property, Plant and Equipment, Accumulated Depreciation		$ 4,970	[1]	$ 4,657
Property, Plant and Equipment, Useful Life (Year)		47 years	[1]	47 years
Road [Member]
Property, Plant and Equipment, Cost		$ 58,728		$ 57,007
Property, Plant and Equipment, Net		41,013		40,138
Property, Plant and Equipment, Accumulated Depreciation		17,715		16,869
Equipment, Locomotives [Member]
Property, Plant and Equipment, Cost		9,166		9,371
Property, Plant and Equipment, Net		5,560		5,592
Property, Plant and Equipment, Accumulated Depreciation		$ 3,606		$ 3,779
Property, Plant and Equipment, Useful Life (Year)		18 years		17 years
Equipment, Freight Cars [Member]
Property, Plant and Equipment, Cost		$ 2,562		$ 2,227
Property, Plant and Equipment, Net		1,664		1,405
Property, Plant and Equipment, Accumulated Depreciation		$ 898		$ 822
Property, Plant and Equipment, Useful Life (Year)		23 years		24 years
Equipment, Work Equipment and Other [Member]
Property, Plant and Equipment, Cost		$ 1,253		$ 1,161
Property, Plant and Equipment, Net		780		750
Property, Plant and Equipment, Accumulated Depreciation		$ 473		$ 411
Property, Plant and Equipment, Useful Life (Year)		17 years		18 years
Equipment [Member]
Property, Plant and Equipment, Cost		$ 12,981		$ 12,759
Property, Plant and Equipment, Net		8,004		7,747
Property, Plant and Equipment, Accumulated Depreciation		4,977		5,012
Technology Equipment [Member]
Property, Plant and Equipment, Cost		1,254		1,209
Property, Plant and Equipment, Net		729		686
Property, Plant and Equipment, Accumulated Depreciation		$ 525		$ 523
Property, Plant and Equipment, Useful Life (Year)		12 years		12 years
Construction in Progress [Member]
Property, Plant and Equipment, Cost		$ 948		$ 961
Property, Plant and Equipment, Net		948		961
Property, Plant and Equipment, Accumulated Depreciation		$ 0		$ 0
[1] Other roadway includes grading, bridges and tunnels, signals, buildings, and other road assets.

X

- Definition

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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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