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Properties (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Cost	$ 46,591	$ 44,748
Accumulated Depreciation	(13,265)	(12,592)
Net Book Value	33,326	32,156
Land
Property, Plant and Equipment [Line Items]
Cost	2,439	2,405
Accumulated Depreciation	0	0
Net Book Value	$ 2,439	$ 2,405
Depreciation Rate	0.00%	0.00%
Rail and other track material
Property, Plant and Equipment [Line Items]
Cost	$ 8,011	$ 7,589
Accumulated Depreciation	(2,006)	(1,971)
Net Book Value	$ 6,005	$ 5,618
Depreciation Rate	2.41%	2.42%
Ties
Property, Plant and Equipment [Line Items]
Cost	$ 6,205	$ 5,981
Accumulated Depreciation	(1,773)	(1,696)
Net Book Value	$ 4,432	$ 4,285
Depreciation Rate	3.42%	3.49%
Ballast
Property, Plant and Equipment [Line Items]
Cost	$ 3,224	$ 3,126
Accumulated Depreciation	(937)	(873)
Net Book Value	$ 2,287	$ 2,253
Depreciation Rate	2.80%	2.84%
Construction in process
Property, Plant and Equipment [Line Items]
Cost	$ 522	$ 431
Accumulated Depreciation	0	0
Net Book Value	$ 522	$ 431
Depreciation Rate	0.00%	0.00%
Other roadway
Property, Plant and Equipment [Line Items]
Cost	$ 14,663	$ 14,270
Accumulated Depreciation	(4,290)	(3,948)
Net Book Value	$ 10,373	$ 10,322
Depreciation Rate	2.72%	2.69%
Total roadway
Property, Plant and Equipment [Line Items]
Cost	$ 32,625	$ 31,397
Accumulated Depreciation	(9,006)	(8,488)
Net Book Value	23,619	22,909
Locomotives
Property, Plant and Equipment [Line Items]
Cost	6,091	5,878
Accumulated Depreciation	(2,105)	(2,060)
Net Book Value	$ 3,986	$ 3,818
Depreciation Rate	3.64%	3.66%
Freight cars
Property, Plant and Equipment [Line Items]
Cost	$ 2,792	$ 2,701
Accumulated Depreciation	(1,037)	(1,033)
Net Book Value	$ 1,755	$ 1,668
Depreciation Rate	2.42%	2.51%
Computers and software
Property, Plant and Equipment [Line Items]
Cost	$ 1,042	$ 926
Accumulated Depreciation	(542)	(476)
Net Book Value	$ 500	$ 450
Depreciation Rate	9.36%	9.10%
Construction in process
Property, Plant and Equipment [Line Items]
Cost	$ 271	$ 206
Accumulated Depreciation	0	0
Net Book Value	$ 271	$ 206
Depreciation Rate	0.00%	0.00%
Other equipment
Property, Plant and Equipment [Line Items]
Cost	$ 1,241	$ 1,145
Accumulated Depreciation	(501)	(463)
Net Book Value	$ 740	$ 682
Depreciation Rate	4.61%	4.51%
Total equipment
Property, Plant and Equipment [Line Items]
Cost	$ 11,437	$ 10,856
Accumulated Depreciation	(4,185)	(4,032)
Net Book Value	7,252	6,824
Other property
Property, Plant and Equipment [Line Items]
Cost	90	90
Accumulated Depreciation	(74)	(72)
Net Book Value	$ 16	$ 18
Depreciation Rate	2.48%	2.26%

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