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Other Liabilities (Tables)
 12 Months Ended
Dec. 31, 2025
Other Liabilities Disclosure [Abstract]  
Schedule of Other Liabilities
 December 31,
 20252024
 ($ in millions)
Long-term advances from Conrail (Note 8)
$534 $534 
Net pension obligations (Note 14)255 252 
Casualty and other claims (Note 19)241 229 
Non-current operating lease liability (Note 12)148 191 
Net other postretirement benefit obligations (Note 14)125 133 
Deferred compensation78 90 
Non-current Eastern Ohio incident liability (Note 19)56 103 
Other286 228 
Total$1,723 $1,760