Revenue - Disaggregated by Product Line (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Sales and other operating revenues	$ 33,547	$ 22,317	$ 61,814	$ 41,183
Refined products
Sales and other operating revenues	29,668	19,489	54,504	35,816
Merchandise
Sales and other operating revenues	1,601	1,286	3,065	2,416
Crude oil and refinery feedstocks
Sales and other operating revenues	1,669	978	3,036	1,861
Midstream services, transportation and other
Sales and other operating revenues	$ 609	$ 564	$ 1,209	$ 1,090