Supplemental Cash Flow Information (Details) - USD ($) $ in Millions			3 Months Ended	12 Months Ended
		Jan. 01, 2019	Mar. 31, 2020	Dec. 31, 2021		Dec. 31, 2020	Dec. 31, 2019		Dec. 31, 2018
Decrease (increase) in current assets:
Receivables, net				$ (4,382)		$ 2,773	$ (1,041)
Inventories				(253)		1,007	(385)
Prepaid expenses and other				(22)		101	0
Increase (decrease) in current liabilities:
Accounts payable				6,301		(4,068)	1,534
Accrued expenses				253		48	(27)
Taxes other than income taxes payable				104		37	60
Income taxes payable				224		(243)	153
Changes in current assets and current liabilities				2,225		(345)	294
Cash Flows Related to Interest and Income Taxes
Interest paid in excess of amount capitalized, including interest on finance leases				598		526	452
Income taxes paid (refunded), net (see Note 16)				(842)		203	(116)
Operating cash flows
Operating Leases				397		444	441
Finance Leases				72		97	50
Investing cash flows
Operating Leases				1		1	1
Financing cash flows
Finance Leases				135		80	40
Changes in lease balances resulting from new and modified leases, Operating Leases	[1]			451		263	1,756
Changes in lease balances resulting from new and modified leases, Finance Leases	[1]			378		950	239
Supplemental Cash Flow Information (Textual)
Decrease in receivables as a result of decreases in sales volumes and commodity prices						3,300
Increase in income taxes receivable						1,000
Construction in Progress [Member]
Supplemental Cash Flow Information (Textual)
MVP Terminal construction costs				1,862		2,399
Topic 842 [Member]
Financing cash flows
Changes in lease balances resulting from new and modified leases, Operating Leases		$ 1,300
MVP Terminal [Member]
Financing cash flows
Changes in lease balances resulting from new and modified leases, Finance Leases			$ 1,400			800
MVP Terminal [Member] | Magellan Midstream Partners LP (Magellan) [Member]
Supplemental Cash Flow Information (Textual)
Long-term liability recorded									$ 292
MVP Terminal [Member] | Construction in Progress [Member]
Supplemental Cash Flow Information (Textual)
MVP Terminal construction costs									$ 539
MVP Terminal [Member] | Topic 842 [Member]
Supplemental Cash Flow Information (Textual)
Derecognized assets related to MVP		539
Derecognized liability related to MVP		292
Equity investment in MVP recorded due to derecognition of assets and liabilities		$ 247
U.S. [Member]
Cash Flows Related to Interest and Income Taxes
Income taxes paid (refunded), net (see Note 16)				(878)	[2]	130	(298)	[3]
Internal Revenue Service (IRS) [Member] | U.S. [Member]
Supplemental Cash Flow Information (Textual)
Refund received, including interest, associated with income tax settlement				$ 962			348
Blender's Tax Credit Receivable [Member]
Supplemental Cash Flow Information (Textual)
Receivable of (collection of) blender's tax credit receivable						$ (449)	$ 449

[1] Noncash activity for the year ended December 31, 2020 primarily included approximately $800 million for a finance lease ROU asset and related liability recognized in connection with the terminaling agreement with MVP described in Note 6. Noncash activity for the year ended December 31, 2019 included $1.3 billion for operating lease ROU assets and related liabilities recorded on January 1, 2019 upon adoption of FASB Accounting Standards Codification Topic 842, “Leases,” (Topic 842).

[2] This amount includes a refund of $962 million that we received related to our U.S. federal income tax return for 2020.

[3] This amount includes a refund of $348 million, including interest, that we received related to the settlement of the combined audit of our U.S. federal income tax returns for 2010 and 2011. See “Tax Returns Under Audit–U.S. Federal” on page 121.