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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2025
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Personal Injury Liability Activity
Our personal injury liability activity was as follows:
Millions, for the nine months ended September 30,20252024
Beginning balance$379 $383 
Current year accruals82 87 
Changes in estimates for prior years9 (2)
Payments(81)(75)
Ending balance at September 30,$389 $393 
Current portion, ending balance at September 30,$105 $114 
Schedule of Environmental Liability Activity
Our environmental liability activity was as follows:
Millions, for the nine months ended September 30,20252024
Beginning balance$268 $245 
Accruals44 100 
Payments(55)(76)
Ending balance at September 30,$257 $269 
Current portion, ending balance at September 30,$66 $119