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Commitments and Contingencies - Narrative (Details) $ in Millions	1 Months Ended	9 Months Ended		125 Months Ended
	Mar. 31, 2025 USD ($) bbl	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Line 901 Incident
Legal, Environmental or Regulatory Matters
Aggregate total estimated costs		$ 870		$ 870
Costs related to the line 901 incident		0	$ 120
Line 901 Incident | Current liabilities
Legal, Environmental or Regulatory Matters
Remaining undiscounted liability		3		3	$ 5
Line 901 2015 Insurance Program
Legal, Environmental or Regulatory Matters
Recoveries from insurance carriers				275
Coverage limit under insurance program		500		500
Arbitration Proceedings Against Insurers | Minimum
Legal, Environmental or Regulatory Matters
Receivable for remaining portion of release costs probable of recovery from insurance		215		215
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		$ 12

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