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Fair Value Measurement - Narrative (Details) - Surmont $ in Billions		3 Months Ended	18 Months Ended
	Oct. 04, 2023 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2025 USD ($)	Oct. 04, 2023 CAD ($)	Oct. 04, 2023 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Percentage of interest acquired				50.00%	50.00%
Business acquisition, maximum payment				$ 0.4	$ 320,000,000
Business combination, contingent, consideration arrangements, term				5 years	5 years
Business acquisition, cost per every dollar exceeding threshold	$ 2,000,000
Business acquisition, threshold (dollars per barrel)					52
Contingent consideration payments		$ 39,000,000	$ 197,000,000

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date.

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