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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2026
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Loss Contingencies by Contingency
The following table summarizes the activity in the Company’s accrued obligations for personal injury claims (in millions):
Three Months Ended March 31,
20262025
Beginning balance$266 $265 
Accruals / changes in estimates26 9 
Payments(23)(35)
     Ending balance$269 $239 
Current portion of ending balance$85 $85 
Accrued Obligations for Environmental Matters
The following table summarizes the activity in the Company’s accrued obligations for environmental matters (in millions):
Three Months Ended March 31,
20262025
Beginning balance$213 $224 
Accruals / changes in estimates2 1 
Payments(5)(3)
     Ending balance$210 $222 
Current portion of ending balance$35 $35