Goodwill and Intangibles (Accumulated Impairment Losses) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Gross goodwill	$ 16,965
Accumulated impairment losses	(8,721)
Goodwill	8,244	$ 8,256	$ 8,256
Refining & Marketing
Goodwill [Line Items]
Gross goodwill	6,141
Accumulated impairment losses	(5,580)
Goodwill	561	561	561
Midstream
Goodwill [Line Items]
Gross goodwill	10,824
Accumulated impairment losses	(3,141)
Goodwill	$ 7,683	$ 7,695	$ 7,695