Supplemental Cash Flow Information (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020
Decrease (increase) in current assets:
Receivables, net		$ (2,643)	$ 3,229
Inventories		(232)	1,577
Prepaid expenses and other		28	70
Increase (decrease) in current liabilities:
Accounts payable		3,624	(4,893)
Accrued expenses		538	17
Taxes other than income taxes payable		200	(24)
Income taxes payable		115	(208)
Changes in current assets and current liabilities		1,630	(232)
Cash Flows Related to Interest and Income Taxes
Interest paid in excess of amount capitalized, including interest on finance leases		397	338
Income taxes paid (refunded), net		(876)	206
Operating cash flows
Operating Leases		296	329
Finance Leases		53	74
Investing cash flows
Operating Leases		1	1
Financing cash flows
Finance Leases		97	51
Changes in lease balances resulting from new and modified leases, Operating Leases	[1]	366	211
Changes in lease balances resulting from new and modified leases, Finance Leases	[1]	93	1,506
Supplemental Cash Flow Information (Textual)
Proceeds from income tax refunds		$ 962
Decrease in receivables as a result of decrease in sales volumes and commodity prices			3,600
Increase in income taxes receivable			770
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 nine months ended September 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.