Business Segments and Related Information, Segment Reporting Information (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Segment revenues [Abstract]
Total revenues		$ 15,417	$ 14,760
Segment expenses [Abstract]
Cost of sales	[1]	12,005	11,405
Other segment income (expense) [Abstract]
Equity in income of unconsolidated affiliates		94	102
Other financial information [Abstract]
Current assets		12,763		$ 15,133
Other assets		1,012		997
Total assets		75,406		77,168
NGL Pipelines & Services [Member]
Segment revenues [Abstract]
Total revenues		5,400	5,140
Other segment income (expense) [Abstract]
Equity in income of unconsolidated affiliates		$ 20	$ 31
Segment Reporting, Other Segment Item, Composition, Description		NGL Pipelines & Services – Non-refundable payments received from shippers attributable to make-up rights and subsequent recognition of revenues attributable to make-up rights.	NGL Pipelines & Services – Non-refundable payments received from shippers attributable to make-up rights and subsequent recognition of revenues attributable to make-up rights.
Crude Oil Pipelines & Services [Member]
Segment revenues [Abstract]
Total revenues		$ 5,121	$ 5,415
Other segment income (expense) [Abstract]
Equity in income of unconsolidated affiliates		$ 72	$ 69
Segment Reporting, Other Segment Item, Composition, Description		Crude Oil Pipelines & Services – Other segment expenses.	Crude Oil Pipelines & Services – Other segment expenses.
Natural Gas Pipelines & Services [Member]
Segment revenues [Abstract]
Total revenues		$ 1,221	$ 854
Other segment income (expense) [Abstract]
Equity in income of unconsolidated affiliates		2	$ 2
Segment Reporting, Other Segment Item, Composition, Description			Natural Gas Pipelines & Services – Other segment expenses.
Petrochemical & Refined Products Services [Member]
Segment revenues [Abstract]
Total revenues		3,675	$ 3,351
Other segment income (expense) [Abstract]
Equity in income of unconsolidated affiliates		$ 0	$ 0
Segment Reporting, Other Segment Item, Composition, Description		Petrochemical & Refined Products Services – Other segment expenses.	Petrochemical & Refined Products Services – Other segment expenses.
Nonrelated Party [Member]
Segment revenues [Abstract]
Total revenues		$ 15,404	$ 14,745
Related Party [Member]
Segment revenues [Abstract]
Total revenues		13	15
Reportable Business Segments [Member]
Segment revenues [Abstract]
Total revenues		50,483	46,643
Segment expenses [Abstract]
Cost of sales		46,795	42,992
Variable operating costs and expenses	[2]	362	329
Fixed operating costs and expenses	[3]	995	928
Total significant segment expenses		48,152	44,249
Other segment income (expense) [Abstract]
Equity in income of unconsolidated affiliates		94	102
Other segment items		39	11
Total other segment income (expense), net		133	113
Total segment gross operating margin		2,464	2,507
Other financial information [Abstract]
Capital expenditures		1,062	1,047
Total assets		56,650		56,900
Reportable Business Segments [Member] | NGL Pipelines & Services [Member]
Segment revenues [Abstract]
Total revenues		22,417	16,695
Segment expenses [Abstract]
Cost of sales		20,433	14,810
Variable operating costs and expenses	[2]	199	174
Fixed operating costs and expenses	[3]	423	425
Total significant segment expenses		21,055	15,409
Other segment income (expense) [Abstract]
Equity in income of unconsolidated affiliates		20	31
Other segment items		36	23
Total other segment income (expense), net		56	54
Total segment gross operating margin		1,418	1,340
Other financial information [Abstract]
Capital expenditures		635	577
Total assets		21,735		21,900
Reportable Business Segments [Member] | Crude Oil Pipelines & Services [Member]
Segment revenues [Abstract]
Total revenues		15,743	19,242
Segment expenses [Abstract]
Cost of sales		15,307	18,749
Variable operating costs and expenses	[2]	35	46
Fixed operating costs and expenses	[3]	101	104
Total significant segment expenses		15,443	18,899
Other segment income (expense) [Abstract]
Equity in income of unconsolidated affiliates		72	69
Other segment items		2	(1)
Total other segment income (expense), net		74	68
Total segment gross operating margin		374	411
Other financial information [Abstract]
Capital expenditures		23	37
Total assets		11,327		11,390
Reportable Business Segments [Member] | Natural Gas Pipelines & Services [Member]
Segment revenues [Abstract]
Total revenues		1,453	1,031
Segment expenses [Abstract]
Cost of sales		899	558
Variable operating costs and expenses	[2]	22	15
Fixed operating costs and expenses	[3]	177	150
Total significant segment expenses		1,098	723
Other segment income (expense) [Abstract]
Equity in income of unconsolidated affiliates		2	2
Other segment items		0	2
Total other segment income (expense), net		2	4
Total segment gross operating margin		357	312
Other financial information [Abstract]
Capital expenditures		303	204
Total assets		12,312		12,260
Reportable Business Segments [Member] | Petrochemical & Refined Products Services [Member]
Segment revenues [Abstract]
Total revenues		10,870	9,675
Segment expenses [Abstract]
Cost of sales		10,156	8,875
Variable operating costs and expenses	[2]	106	94
Fixed operating costs and expenses	[3]	294	249
Total significant segment expenses		10,556	9,218
Other segment income (expense) [Abstract]
Equity in income of unconsolidated affiliates		0	0
Other segment items		1	(13)
Total other segment income (expense), net		1	(13)
Total segment gross operating margin		315	444
Other financial information [Abstract]
Capital expenditures		101	229
Total assets		11,276		11,350
Reportable Business Segments [Member] | Nonrelated Party [Member]
Segment revenues [Abstract]
Total revenues		15,404	14,745
Reportable Business Segments [Member] | Nonrelated Party [Member] | NGL Pipelines & Services [Member]
Segment revenues [Abstract]
Total revenues		5,398	5,137
Reportable Business Segments [Member] | Nonrelated Party [Member] | Crude Oil Pipelines & Services [Member]
Segment revenues [Abstract]
Total revenues		5,115	5,406
Reportable Business Segments [Member] | Nonrelated Party [Member] | Natural Gas Pipelines & Services [Member]
Segment revenues [Abstract]
Total revenues		1,216	851
Reportable Business Segments [Member] | Nonrelated Party [Member] | Petrochemical & Refined Products Services [Member]
Segment revenues [Abstract]
Total revenues		3,675	3,351
Reportable Business Segments [Member] | Related Party [Member]
Segment revenues [Abstract]
Total revenues		13	15
Reportable Business Segments [Member] | Related Party [Member] | NGL Pipelines & Services [Member]
Segment revenues [Abstract]
Total revenues		2	3
Reportable Business Segments [Member] | Related Party [Member] | Crude Oil Pipelines & Services [Member]
Segment revenues [Abstract]
Total revenues		6	9
Reportable Business Segments [Member] | Related Party [Member] | Natural Gas Pipelines & Services [Member]
Segment revenues [Abstract]
Total revenues		5	3
Reportable Business Segments [Member] | Related Party [Member] | Petrochemical & Refined Products Services [Member]
Segment revenues [Abstract]
Total revenues		0	0
Eliminations [Member]
Segment revenues [Abstract]
Total revenues		(35,066)	(31,883)
Eliminations [Member] | NGL Pipelines & Services [Member]
Segment revenues [Abstract]
Total revenues		(17,017)	(11,555)
Eliminations [Member] | Crude Oil Pipelines & Services [Member]
Segment revenues [Abstract]
Total revenues		(10,622)	(13,827)
Eliminations [Member] | Natural Gas Pipelines & Services [Member]
Segment revenues [Abstract]
Total revenues		(232)	(177)
Eliminations [Member] | Petrochemical & Refined Products Services [Member]
Segment revenues [Abstract]
Total revenues		(7,195)	$ (6,324)
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Other financial information [Abstract]
Construction in progress		4,981		4,138
Current assets		12,763		15,133
Other assets		$ 1,012		$ 997

[1] Cost of sales is a component of “Operating costs and expenses” as presented on our Unaudited Condensed Statements of Consolidated Operations.  Fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.

[2] Variable operating costs and expenses represent the cost of operating our plants, pipelines and other fixed assets that generally fluctuate based on utilization. 

[3] Fixed operating costs and expenses represent the cost of operating our plants, pipelines and other fixed assets that generally remain constant independent of utilization.