Supplemental Cash Flow Information (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Decrease (increase) in current assets:
Receivables, net		$ (3,069)	$ 4,177
Inventories		(47)	1,136
Prepaid expenses and other		(103)	56
Increase (decrease) in current liabilities:
Accounts payable		3,979	(5,446)
Accrued expenses		284	(73)
Taxes other than income taxes payable		162	(180)
Income taxes payable		45	(148)
Changes in current assets and current liabilities		1,251	(478)
Cash Flows Related to Interest and Income Taxes
Interest paid in excess of amount capitalized, including interest on finance leases		290	250
Income taxes paid (refunded), net		(882)	76
Operating cash flows
Operating Leases		199	216
Finance Leases		35	48
Financing cash flows
Finance Leases		63	32
Changes in lease balances resulting from new and modified leases, Operating Leases	[1]	315	163
Changes in lease balances resulting from new and modified leases, Finance Leases	[1]	46	1,495
Supplemental Cash Flow Information (Textual)
Proceeds from income tax refunds		$ 962
Decrease in receivables as a result of decrease in commodity prices and sales volumes			4,100
Increase (decrease) in income taxes receivable			440
MVP Terminal [Member]
Financing cash flows
Changes in lease balances resulting from new and modified leases, Finance Leases			1,400
Blender's Tax Credit Receivable [Member]
Supplemental Cash Flow Information (Textual)
Collection of blender's tax credit receivable			$ 449

[1] Noncash activity for the six months ended June 30, 2020 primarily included $1.4 billion for a finance lease right-of-use asset and related liability recognized in connection with the terminaling agreement with MVP.