Financial and Derivative Instruments - Effect of Derivatives (Details) - Commodity - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments
Effect of derivatives, gain (loss), net	$ (49)	$ 69	$ (258)	$ (16)
Sales and other operating revenues
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments
Effect of derivatives, gain (loss), net	(82)	78	(240)	(19)
Purchased crude oil and products
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments
Effect of derivatives, gain (loss), net	25	1	(39)	19
Other income (loss)
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments
Effect of derivatives, gain (loss), net	$ 8	$ (10)	$ 21	$ (16)