Financial Instruments and Derivatives - Derivative Instruments (Details) - Not Designated As Hedging Instrument, Trading [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Realized and Unrealized Before-Tax Gain / Loss on Derivative Instruments Recognized in the Consolidated Statement of Income
Total	$ (658)	$ 1,065	$ (1,449)
Sales and other operating revenue
Realized and Unrealized Before-Tax Gain / Loss on Derivative Instruments Recognized in the Consolidated Statement of Income
Total	(661)	986	(1,763)
Crude oil and product purchases
Realized and Unrealized Before-Tax Gain / Loss on Derivative Instruments Recognized in the Consolidated Statement of Income
Total	$ 3	$ 79	$ 314