Business Segments and Related Information, Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Information by business segment [Abstract]
Segment gross operating margin	$ 2,320	$ 2,342	$ 6,815	$ 6,990
Revenues from third parties	11,980	15,448	35,049	44,481
Revenues from related parties	18	20	44	55
Intersegment and intrasegment revenues	0	0	0	0
Total revenues	11,998	15,468	35,093	44,536
Equity in income of unconsolidated affiliates	122	111	347	335
Property, plant and equipment, net	45,340		45,340		$ 44,401
Investments in unconsolidated affiliates	2,337		2,337		2,352
Intangible assets, net	3,821		3,821		3,965
Goodwill	5,608		5,608		5,608
Segment assets	57,106		57,106		56,326
NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	3,757	6,237	12,375	18,371
Equity in income of unconsolidated affiliates	32	39	101	109
Investments in unconsolidated affiliates	618		618		640
Intangible assets, net	839		839		865
Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	5,365	4,724	13,850	14,181
Equity in income of unconsolidated affiliates	89	70	241	221
Investments in unconsolidated affiliates	1,684		1,684		1,677
Intangible assets, net	1,700		1,700		1,776
Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	884	1,886	2,874	4,696
Equity in income of unconsolidated affiliates	1	2	4	4
Investments in unconsolidated affiliates	32		32		32
Intangible assets, net	1,170		1,170		1,206
Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Total revenues	1,992	2,621	5,994	7,288
Equity in income of unconsolidated affiliates	0	0	1	1
Investments in unconsolidated affiliates	3		3		3
Intangible assets, net	112		112		118
Reportable Business Segments [Member] | NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	1,196	1,296	3,518	3,848
Revenues from third parties	3,754	6,232	12,367	18,358
Revenues from related parties	3	5	8	13
Intersegment and intrasegment revenues	12,367	14,666	34,347	52,079
Total revenues	16,124	20,903	46,722	70,450
Equity in income of unconsolidated affiliates	32	39	101	109
Property, plant and equipment, net	17,468		17,468		17,283
Investments in unconsolidated affiliates	618		618		640
Intangible assets, net	839		839		865
Goodwill	2,811		2,811		2,811
Segment assets	21,736		21,736		21,599
Reportable Business Segments [Member] | Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	432	415	1,251	1,237
Revenues from third parties	5,354	4,720	13,825	14,163
Revenues from related parties	11	4	25	18
Intersegment and intrasegment revenues	16,343	13,456	41,139	35,327
Total revenues	21,708	18,180	54,989	49,508
Equity in income of unconsolidated affiliates	89	70	241	221
Property, plant and equipment, net	6,671		6,671		6,760
Investments in unconsolidated affiliates	1,684		1,684		1,677
Intangible assets, net	1,700		1,700		1,776
Goodwill	1,841		1,841		1,841
Segment assets	11,896		11,896		12,054
Reportable Business Segments [Member] | Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	239	278	791	727
Revenues from third parties	880	1,875	2,863	4,672
Revenues from related parties	4	11	11	24
Intersegment and intrasegment revenues	133	262	386	683
Total revenues	1,017	2,148	3,260	5,379
Equity in income of unconsolidated affiliates	1	2	4	4
Property, plant and equipment, net	9,821		9,821		9,721
Investments in unconsolidated affiliates	32		32		32
Intangible assets, net	1,170		1,170		1,206
Goodwill	0		0		0
Segment assets	11,023		11,023		10,959
Reportable Business Segments [Member] | Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Segment gross operating margin	453	353	1,255	1,178
Revenues from third parties	1,992	2,621	5,994	7,288
Revenues from related parties	0	0	0	0
Intersegment and intrasegment revenues	4,307	5,934	13,108	14,446
Total revenues	6,299	8,555	19,102	21,734
Equity in income of unconsolidated affiliates	0	0	1	1
Property, plant and equipment, net	9,374		9,374		7,770
Investments in unconsolidated affiliates	3		3		3
Intangible assets, net	112		112		118
Goodwill	956		956		956
Segment assets	10,445		10,445		8,847
Eliminations [Member]
Information by business segment [Abstract]
Revenues from third parties	0	0	0	0
Revenues from related parties	0	0	0	0
Intersegment and intrasegment revenues	(33,150)	(34,318)	(88,980)	(102,535)
Total revenues	(33,150)	(34,318)	(88,980)	(102,535)
Equity in income of unconsolidated affiliates	0	$ 0	0	$ 0
Adjustments [Member]
Information by business segment [Abstract]
Property, plant and equipment, net	2,006		2,006		2,867
Investments in unconsolidated affiliates	0		0		0
Intangible assets, net	0		0		0
Goodwill	0		0		0
Segment assets	$ 2,006		$ 2,006		$ 2,867