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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2024
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,
20242023
Beginning balance$264 $263 
Accruals / changes in estimates26 17 
Payments(28)(19)
     Ending balance$262 $261 
Current portion of ending balance$85 $90 
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,
20242023
Beginning balance$236 $247 
Accruals / changes in estimates— 1 
Payments(4)(4)
     Ending balance$232 $244 
Current portion of ending balance$35 $35