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Properties (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Cost $ 49,788 $ 46,591
Accumulated depreciation (13,957) (13,265)
Net book value 35,831 33,326
Land    
Property, Plant and Equipment [Line Items]    
Cost 4,125 2,439
Accumulated depreciation 0 0
Net book value $ 4,125 $ 2,439
Depreciation rate 0.00% 0.00%
Total roadway    
Property, Plant and Equipment [Line Items]    
Cost $ 33,909 $ 32,625
Accumulated depreciation (9,552) (9,006)
Net book value 24,357 23,619
Rail and other track material    
Property, Plant and Equipment [Line Items]    
Cost 8,402 8,011
Accumulated depreciation (2,098) (2,006)
Net book value $ 6,304 $ 6,005
Depreciation rate 2.44% 2.41%
Ties    
Property, Plant and Equipment [Line Items]    
Cost $ 6,450 $ 6,205
Accumulated depreciation (1,860) (1,773)
Net book value $ 4,590 $ 4,432
Depreciation rate 3.35% 3.42%
Ballast    
Property, Plant and Equipment [Line Items]    
Cost $ 3,339 $ 3,224
Accumulated depreciation (1,005) (937)
Net book value $ 2,334 $ 2,287
Depreciation rate 2.73% 2.80%
Construction in process    
Property, Plant and Equipment [Line Items]    
Cost $ 680 $ 522
Accumulated depreciation 0 0
Net book value $ 680 $ 522
Depreciation rate 0.00% 0.00%
Other roadway    
Property, Plant and Equipment [Line Items]    
Cost $ 15,038 $ 14,663
Accumulated depreciation (4,589) (4,290)
Net book value $ 10,449 $ 10,373
Depreciation rate 2.73% 2.72%
Total equipment    
Property, Plant and Equipment [Line Items]    
Cost $ 11,664 $ 11,437
Accumulated depreciation (4,329) (4,185)
Net book value 7,335 7,252
Locomotives    
Property, Plant and Equipment [Line Items]    
Cost 6,242 6,091
Accumulated depreciation (2,180) (2,105)
Net book value $ 4,062 $ 3,986
Depreciation rate 3.66% 3.64%
Freight cars    
Property, Plant and Equipment [Line Items]    
Cost $ 2,733 $ 2,792
Accumulated depreciation (1,021) (1,037)
Net book value $ 1,712 $ 1,755
Depreciation rate 2.45% 2.42%
Computers and software    
Property, Plant and Equipment [Line Items]    
Cost $ 1,149 $ 1,042
Accumulated depreciation (570) (542)
Net book value $ 579 $ 500
Depreciation rate 9.88% 9.36%
Construction in process    
Property, Plant and Equipment [Line Items]    
Cost $ 236 $ 271
Accumulated depreciation 0 0
Net book value $ 236 $ 271
Depreciation rate 0.00% 0.00%
Other equipment    
Property, Plant and Equipment [Line Items]    
Cost $ 1,304 $ 1,241
Accumulated depreciation (558) (501)
Net book value $ 746 $ 740
Depreciation rate 4.60% 4.61%
Other property    
Property, Plant and Equipment [Line Items]    
Cost $ 90 $ 90
Accumulated depreciation (76) (74)
Net book value $ 14 $ 16
Depreciation rate 2.48% 2.48%