Intangible Assets and Goodwill - Schedule of Intangible Assets by Business Segment (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	$ 6,700	$ 6,339
Accumulated Amortization	(2,493)	(2,334)
Carrying Value	4,207	4,005
NGL Pipelines & Services
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	1,499	1,203
Accumulated Amortization	(453)	(417)
Carrying Value	1,046	786
NGL Pipelines & Services | Customer relationship intangibles
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	449	449
Accumulated Amortization	(286)	(276)
Carrying Value	163	173
NGL Pipelines & Services | Contract-based intangibles
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	1,050	754
Accumulated Amortization	(167)	(141)
Carrying Value	883	613
Crude Oil Pipelines & Services
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	2,478	2,478
Accumulated Amortization	(968)	(905)
Carrying Value	1,510	1,573
Crude Oil Pipelines & Services | Customer relationship intangibles
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	2,195	2,195
Accumulated Amortization	(689)	(627)
Carrying Value	1,506	1,568
Crude Oil Pipelines & Services | Contract-based intangibles
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	283	283
Accumulated Amortization	(279)	(278)
Carrying Value	4	5
Natural Gas Pipelines & Services
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	2,497	2,432
Accumulated Amortization	(945)	(890)
Carrying Value	1,552	1,542
Natural Gas Pipelines & Services | Customer relationship intangibles
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	1,351	1,351
Accumulated Amortization	(691)	(663)
Carrying Value	660	688
Natural Gas Pipelines & Services | Contract-based intangibles
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	1,146	1,081
Accumulated Amortization	(254)	(227)
Carrying Value	892	854
Petrochemical & Refined Products Services
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	226	226
Accumulated Amortization	(127)	(122)
Carrying Value	99	104
Petrochemical & Refined Products Services | Customer relationship intangibles
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Value	181	181
Accumulated Amortization	(97)	(92)
Carrying Value	84	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