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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 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):
Six Months Ended June 30,
20242023
Beginning balance$264 $263 
Accruals / changes in estimates56 42 
Payments(56)(47)
     Ending balance$264 $258 
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):
Six Months Ended June 30,
20242023
Beginning balance$236 $247 
Accruals / changes in estimates1 1 
Payments(8)(9)
     Ending balance$229 $239 
Current portion of ending balance$35 $35