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Commitments and Contingencies - Narrative (Details)
$ in Millions
1 Months Ended 122 Months Ended
Mar. 31, 2025
USD ($)
bbl
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Line 901 Incident      
Legal, Environmental or Regulatory Matters      
Aggregate total estimated costs   $ 870  
Line 901 Incident | Current liabilities      
Legal, Environmental or Regulatory Matters      
Remaining undiscounted liability   20 $ 5
Line 901 2015 Insurance Program      
Legal, Environmental or Regulatory Matters      
Recoveries from insurance carriers   275  
Coverage limit under insurance program   500  
Arbitration Proceedings Against Insurers | Minimum      
Legal, Environmental or Regulatory Matters      
Receivable for remaining portion of release costs probable of recovery from insurance   225  
Line 48 Incident      
Legal, Environmental or Regulatory Matters      
Estimated size of release (in barrels) | bbl 125    
Self-insured retention $ 10    
Aggregate cost to clean-up and remediate $ 20    
Clean-up and remediation activities   $ 12