Intangible Assets and Goodwill - Schedule of Intangible Assets by Business Segment (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	$ 6,340	$ 6,339
Accumulated Amortization	(2,438)	(2,334)
Carrying Value	3,902	4,005
NGL Pipelines & Services
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	1,203	1,203
Accumulated Amortization	(440)	(417)
Carrying Value	763	786
NGL Pipelines & Services | Customer relationship intangibles
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	449	449
Accumulated Amortization	(282)	(276)
Carrying Value	167	173
NGL Pipelines & Services | Contract-based intangibles
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	754	754
Accumulated Amortization	(158)	(141)
Carrying Value	596	613
Crude Oil Pipelines & Services
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	2,478	2,478
Accumulated Amortization	(947)	(905)
Carrying Value	1,531	1,573
Crude Oil Pipelines & Services | Customer relationship intangibles
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	2,195	2,195
Accumulated Amortization	(669)	(627)
Carrying Value	1,526	1,568
Crude Oil Pipelines & Services | Contract-based intangibles
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	283	283
Accumulated Amortization	(278)	(278)
Carrying Value	5	5
Natural Gas Pipelines & Services
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	2,433	2,432
Accumulated Amortization	(926)	(890)
Carrying Value	1,507	1,542
Natural Gas Pipelines & Services | Customer relationship intangibles
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	1,351	1,351
Accumulated Amortization	(682)	(663)
Carrying Value	669	688
Natural Gas Pipelines & Services | Contract-based intangibles
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	1,082	1,081
Accumulated Amortization	(244)	(227)
Carrying Value	838	854
Petrochemical & Refined Products Services
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	226	226
Accumulated Amortization	(125)	(122)
Carrying Value	101	104
Petrochemical & Refined Products Services | Customer relationship intangibles
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	181	181
Accumulated Amortization	(95)	(92)
Carrying Value	86	89
Petrochemical & Refined Products Services | Contract-based intangibles
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	45	45
Accumulated Amortization	(30)	(30)
Carrying Value	$ 15	$ 15