Intangible Assets and Goodwill - Schedule of Intangible Assets by Business Segment (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract]
Gross Value	$ 6,718	$ 6,709
Accumulated Amortization	(2,667)	(2,550)
Carrying Value	4,051	4,159
NGL Pipelines & Services
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract]
Gross Value	1,503	1,499
Accumulated Amortization	(493)	(466)
Carrying Value	1,010	1,033
NGL Pipelines & Services | Customer relationship intangibles
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract]
Gross Value	449	449
Accumulated Amortization	(294)	(289)
Carrying Value	155	160
NGL Pipelines & Services | Contract-based intangibles
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract]
Gross Value	1,054	1,050
Accumulated Amortization	(199)	(177)
Carrying Value	855	873
Crude Oil Pipelines & Services
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract]
Gross Value	2,478	2,478
Accumulated Amortization	(1,038)	(990)
Carrying Value	1,440	1,488
Crude Oil Pipelines & Services | Customer relationship intangibles
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract]
Gross Value	2,195	2,195
Accumulated Amortization	(758)	(710)
Carrying Value	1,437	1,485
Crude Oil Pipelines & Services | Contract-based intangibles
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract]
Gross Value	283	283
Accumulated Amortization	(280)	(280)
Carrying Value	3	3
Natural Gas Pipelines & Services
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract]
Gross Value	2,506	2,501
Accumulated Amortization	(1,003)	(965)
Carrying Value	1,503	1,536
Natural Gas Pipelines & Services | Customer relationship intangibles
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract]
Gross Value	1,351	1,351
Accumulated Amortization	(718)	(700)
Carrying Value	633	651
Natural Gas Pipelines & Services | Contract-based intangibles
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract]
Gross Value	1,155	1,150
Accumulated Amortization	(285)	(265)
Carrying Value	870	885
Petrochemical & Refined Products Services
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract]
Gross Value	231	231
Accumulated Amortization	(133)	(129)
Carrying Value	98	102
Petrochemical & Refined Products Services | Customer relationship intangibles
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract]
Gross Value	181	181
Accumulated Amortization	(103)	(99)
Carrying Value	78	82
Petrochemical & Refined Products Services | Contract-based intangibles
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract]
Gross Value	50	50
Accumulated Amortization	(30)	(30)
Carrying Value	$ 20	$ 20