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Properties (Tables)
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Schedule of Properties
  AccumulatedNet BookDepreciation
December 31, 2024CostDepreciationValue
Rate (1)
 ($ in millions)
Land$4,125 $— $4,125                 —
Roadway:    
Rail and other track material8,402 (2,098)6,304 2.44 %
Ties6,450 (1,860)4,590 3.35 %
Ballast3,339 (1,005)2,334 2.73 %
Construction in process680 — 680                 —
Other roadway15,038 (4,589)10,449 2.73 %
Total roadway33,909 (9,552)24,357  
Equipment:    
Locomotives6,242 (2,180)4,062 3.66 %
Freight cars2,733 (1,021)1,712 2.45 %
Computers and software1,149 (570)579 9.88 %
Construction in process236 — 236                 —
Other equipment1,304 (558)746 4.60 %
Total equipment11,664 (4,329)7,335  
Other property90 (76)14 2.48 %
Total properties$49,788 $(13,957)$35,831  
 
  AccumulatedNet BookDepreciation
December 31, 2023CostDepreciationValue
Rate (1)
 ($ in millions)
Land$2,439 $— $2,439                 —
Roadway:    
Rail and other track material8,011 (2,006)6,005 2.41 %
Ties6,205 (1,773)4,432 3.42 %
Ballast3,224 (937)2,287 2.80 %
Construction in process522 — 522                 —
Other roadway14,663 (4,290)10,373 2.72 %
Total roadway32,625 (9,006)23,619  
Equipment:    
Locomotives6,091 (2,105)3,986 3.64 %
Freight cars2,792 (1,037)1,755 2.42 %
Computers and software1,042 (542)500 9.36 %
Construction in process271 — 271                 —
Other equipment1,241 (501)740 4.61 %
Total equipment11,437 (4,185)7,252  
Other property90 (74)16 2.48 %
Total properties$46,591 $(13,265)$33,326  

(1)Composite annual depreciation rate for the underlying assets, excluding the effects of the amortization of any deficiency (or excess) that resulted from our depreciation studies.