Supplemental Cash Flow Information (Summary Of Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Net cash provided by operating activities included:
Interest paid (net of amounts capitalized)	$ 1,060		$ 1,231	$ 1,235
Net income taxes paid to taxing authorities	4,869		2,436	(179)
Payments on operating leases	498		569	651
Interest payments under finance lease obligations	24		21	25
Net cash provided by financing activities included:
Principal payments under finance lease obligations	79		71	66
Non-cash investing and financing activities:
Right of use assets obtained in exchange for new operating lease obligations	367		349	343
Right of use assets obtained in exchange for new finance lease obligations	60		37	110
Contribution of net assets	818	[1]	0	0
Book value of equity method investment	$ 150	[2]	$ 0	$ 0

[1] Represents the book value of property, plant and equipment, inventory and working capital contributed by MPC to Martinez Renewables LLC. See Note 16 for additional information.

[2] Represents the book value of MPC’s equity method investment in Watson Cogeneration Company and Crowley Ocean Partners prior to MPC buying out the remaining interest in these entities. See Note 16 for additional information