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Properties (Tables)
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
Schedule of Properties
  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  
 
  AccumulatedNet BookDepreciation
December 31, 2022CostDepreciationValue
Rate (1)
 ($ in millions)
Land$2,405 $— $2,405                 —
Roadway:    
Rail and other track material7,589 (1,971)5,618 2.42 %
Ties5,981 (1,696)4,285 3.49 %
Ballast3,126 (873)2,253 2.84 %
Construction in process431 — 431                 —
Other roadway14,270 (3,948)10,322 2.69 %
Total roadway31,397 (8,488)22,909  
Equipment:    
Locomotives5,878 (2,060)3,818 3.66 %
Freight cars2,701 (1,033)1,668 2.51 %
Computers and software926 (476)450 9.10 %
Construction in process206 — 206                 —
Other equipment1,145 (463)682 4.51 %
Total equipment10,856 (4,032)6,824  
Other property90 (72)18 2.26 %
Total properties$44,748 $(12,592)$32,156  

(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.