Property, Plant, and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant, and Equipment, Net
Finance lease ROU assets (see Note 6)	$ 1,902	$ 944
Property, plant, and equipment, at cost	46,967	44,294
Accumulated depreciation	(16,578)	(15,030)
Property, plant, and equipment, net	30,389	29,264
Property, Plant, and Equipment (Textual)
Accumulated amortization of finance lease ROU assets	280	155
Depreciation expense	1,600	1,500	$ 1,400
Land [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	485	476
Crude Oil Processing Facilities [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	32,246	31,419
Transportation and Terminaling Facilities [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	5,290	5,179
Rendered and Recycled Materials Processing Facilities [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	631	628
Corn Processing Facilities [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	1,212	1,201
Administrative Buildings [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	1,038	1,015
Other [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	1,764	1,701
Construction in Progress [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	$ 2,399	$ 1,731