COMMITMENTS, CONTINGENCIES AND GUARANTEES - LESSOR INFORMATION (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Lessor, Lease, Description [Line Items]
Property, plant and equipment, gross	$ 66,900	$ 80,397
Accumulated depreciation	(17,889)	(18,960)
Interest income	3	5	$ 6
Total revenues from sales-type lease	3	5	6
Fixed lease payments	362	340	321
Variable lease payments	24	38	34
Total revenues from operating leases	$ 386	$ 378	$ 355
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]	Unregulated Operating Revenue	Unregulated Operating Revenue	Unregulated Operating Revenue
Depreciation expense	$ 2,537	$ 2,409	$ 2,202
Disposal Group Held-for-sale | SI Partners
Lessor, Lease, Description [Line Items]
Disposal group, property, plant and equipment subject to operating leases	1,336
Disposal group, property, plant and equipment subject to operating leases, accumulated depreciation	688
Pipelines and storage
Lessor, Lease, Description [Line Items]
Property, plant and equipment, gross		1,313
Pipelines and storage | Disposal Group Held-for-sale | SI Partners
Lessor, Lease, Description [Line Items]
Disposal group, property, plant and equipment subject to operating leases	1,320
Refined products terminals
Lessor, Lease, Description [Line Items]
Property, plant and equipment, gross		623
Refined products terminals | Disposal Group Held-for-sale | SI Partners
Lessor, Lease, Description [Line Items]
Disposal group, property, plant and equipment subject to operating leases	628
Other
Lessor, Lease, Description [Line Items]
Property, plant and equipment, gross		77
Other | Disposal Group Held-for-sale | SI Partners
Lessor, Lease, Description [Line Items]
Disposal group, property, plant and equipment subject to operating leases	76
Lease assets
Lessor, Lease, Description [Line Items]
Property, plant and equipment, gross		2,013
Accumulated depreciation		(605)
Property, plant and equipment, net		1,408
Depreciation expense	$ 53	$ 73	$ 62