Financial and Derivative Instruments - Effect of Derivatives (Details) - Commodity - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments
Effect of derivatives, gain (loss), net	$ 305	$ (630)	$ 47	$ (646)
Sales and other operating revenues
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments
Effect of derivatives, gain (loss), net	258	(420)	18	(439)
Purchased crude oil and products
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments
Effect of derivatives, gain (loss), net	55	(202)	16	(183)
Other income (loss)
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments
Effect of derivatives, gain (loss), net	$ (8)	$ (8)	$ 13	$ (24)