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Properties (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Cost	$ 43,684	$ 43,330
Accumulated Depreciation	(12,031)	(11,985)
Net Book Value	31,653	31,345
Land
Property, Plant and Equipment [Line Items]
Cost	2,453	2,394
Accumulated Depreciation	0	0
Net Book Value	$ 2,453	$ 2,394
Depreciation Rate	0.00%	0.00%
Rail and other track material
Property, Plant and Equipment [Line Items]
Cost	$ 7,330	$ 7,153
Accumulated Depreciation	(1,907)	(1,892)
Net Book Value	$ 5,423	$ 5,261
Depreciation Rate	2.40%	2.35%
Ties
Property, Plant and Equipment [Line Items]
Cost	$ 5,779	$ 5,685
Accumulated Depreciation	(1,642)	(1,601)
Net Book Value	$ 4,137	$ 4,084
Depreciation Rate	3.44%	3.41%
Ballast
Property, Plant and Equipment [Line Items]
Cost	$ 3,041	$ 2,973
Accumulated Depreciation	(818)	(774)
Net Book Value	$ 2,223	$ 2,199
Depreciation Rate	2.79%	2.76%
Construction in process
Property, Plant and Equipment [Line Items]
Cost	$ 339	$ 297
Accumulated Depreciation	0	0
Net Book Value	$ 339	$ 297
Depreciation Rate	0.00%	0.00%
Other roadway
Property, Plant and Equipment [Line Items]
Cost	$ 14,111	$ 14,320
Accumulated Depreciation	(3,733)	(3,926)
Net Book Value	$ 10,378	$ 10,394
Depreciation Rate	2.69%	2.71%
Total roadway
Property, Plant and Equipment [Line Items]
Cost	$ 30,600	$ 30,428
Accumulated Depreciation	(8,100)	(8,193)
Net Book Value	22,500	22,235
Locomotives
Property, Plant and Equipment [Line Items]
Cost	5,695	5,478
Accumulated Depreciation	(1,994)	(1,911)
Net Book Value	$ 3,701	$ 3,567
Depreciation Rate	3.87%	3.56%
Freight cars
Property, Plant and Equipment [Line Items]
Cost	$ 2,701	$ 2,780
Accumulated Depreciation	(1,009)	(1,023)
Net Book Value	$ 1,692	$ 1,757
Depreciation Rate	2.59%	2.59%
Computers and software
Property, Plant and Equipment [Line Items]
Cost	$ 893	$ 732
Accumulated Depreciation	(438)	(391)
Net Book Value	$ 455	$ 341
Depreciation Rate	10.34%	9.86%
Construction in process
Property, Plant and Equipment [Line Items]
Cost	$ 164	$ 333
Accumulated Depreciation	0	0
Net Book Value	$ 164	$ 333
Depreciation Rate	0.00%	0.00%
Other equipment
Property, Plant and Equipment [Line Items]
Cost	$ 1,088	$ 1,094
Accumulated Depreciation	(420)	(399)
Net Book Value	$ 668	$ 695
Depreciation Rate	4.63%	4.70%
Total equipment
Property, Plant and Equipment [Line Items]
Cost	$ 10,541	$ 10,417
Accumulated Depreciation	(3,861)	(3,724)
Net Book Value	6,680	6,693
Other property
Property, Plant and Equipment [Line Items]
Cost	90	91
Accumulated Depreciation	(70)	(68)
Net Book Value	$ 20	$ 23
Depreciation Rate	2.25%	2.24%

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