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Current Liabilities (Tables)
12 Months Ended
Dec. 31, 2023
Payables and Accruals [Abstract]  
Current Liabilities
 December 31,
 20232022
 ($ in millions)
Accounts payable:  
Accounts and wages payable$997 $712 
Due to Conrail (Note 6)198 173 
Casualty and other claims (Note 17)186 170 
Vacation liability144 136 
Other113 102 
Total$1,638 $1,293 
Other current liabilities:  
Current Eastern Ohio incident liability (Note 17)$346 $— 
Interest payable193 157 
Current operating lease liability (Note 10)105 94 
Pension benefit obligations (Note 12)21 20 
Other63 70 
Total$728 $341