Operations And Basis of Presentation Schedule of Impact of Accounting Changes (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019		Jun. 30, 2020	Jun. 30, 2019		Dec. 31, 2019		Dec. 31, 2018
Net income (loss)	$ 719	$ 1,282	[1]	$ (195)	$ 2,501	[1]	$ 5,112		$ 3,829
Inventories	1,593			1,593			1,532	[1]	1,372
Property, Plant and Equipment, Net	74,649			74,649			73,896	[1]
Current maturities of long-term debt	34			34			25	[1]
Cost of products sold	4,117	10,301	[1]	12,408	19,778	[1]	39,677		41,603
Operating expenses	770	792	[1]	1,649	1,600	[1]
Other non-current liabilities	1,216			1,216			1,161	[1]
Operating Lease, Liability, Noncurrent	903			903			901	[1]
Long-term debt, less current maturities	51,179			51,179			50,905	[1]
Operating Lease, Liability, Current	54			54			60	[1]
Accrued and other current liabilities	2,730			2,730			3,339	[1]
Partners' Capital	27,253			27,253			27,382	[1]	28,885
Inventory, LIFO Reserve, Period Charge				137	(97)	[1]
Net change in operating assets and liabilities, net of effects of acquisitions		150		27	(187)	[1]	(405)		62
Operating Income (Loss)	1,342	1,828	[1]	1,407	3,694	[1]	7,211		5,457
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	817	1,317	[1]	(68)	2,662	[1]	5,312		4,099
Income (Loss) Attributable to Parent, before Tax	817	1,317	[1]	(68)	2,662	[1]
Net Income (Loss) Attributable to Parent	481	1,003	[1]	(239)	1,953	[1]
Comprehensive income	766	1,283	[1]	(167)	2,510	[1]	5,136		3,786
Comprehensive income attributable to partners	528	1,004	[1]	(211)	1,962	[1]	4,034		3,037
Assets, Current	5,166			5,166			7,486	[1]	6,515
Other Assets, Noncurrent	1,511			1,511			1,572	[1]	1,478
Assets	98,484			$ 98,484			102,296	[1]	88,609
Previously Reported [Member]
Net income (loss)		1,281			2,562		5,186		3,774
Inventories							1,935	[2]	1,677
Cost of products sold		10,302			19,717		39,603		41,658
Partners' Capital							27,289	[2]	28,718
Net change in operating assets and liabilities, net of effects of acquisitions		(151)			248		479		(117)
Operating Income (Loss)		1,827			3,755		7,285		5,402
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		1,316			2,723		5,386		4,044
Comprehensive income		1,282			2,571		5,210		3,731
Comprehensive income attributable to partners		1,003			2,023		4,108		2,982
Assets, Current							7,889	[2]	6,820
Other Assets, Noncurrent							1,076	[2]	1,006
Assets							102,203	[2]	88,442
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]
Net income (loss)	$ 265
Inventories							(403)		(305)
Partners' Capital							93
Assets, Current							(403)
Other Assets, Noncurrent							496
Assets							93
Change in Inventory Accounting Policy [Member]
Net income (loss)		1			(61)		(74)		55
Cost of products sold		(1)			61		74		(55)
Partners' Capital									167
Net change in operating assets and liabilities, net of effects of acquisitions		1			(61)		(74)		55
Operating Income (Loss)		1			(61)		(74)		55
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		1			(61)		(74)		55
Comprehensive income		1			(61)		(74)		55
Comprehensive income attributable to partners		$ 1			$ (61)		$ (74)		55
Assets, Current									(305)
Other Assets, Noncurrent									472
Assets									$ 167

[1] *As adjusted. See Note 1.

[2] * Amounts reflect the retrospective consolidation of the SemGroup entities discussed above.