LEASES - Schedule of Net Book Value of Assets Subject to Leases (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]
Lessor asset under operating lease, accumulated depreciation	$ 1,180	$ 941
Operating lease equipment, net	9,621	9,323	$ 8,746
Railcars and locomotives
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]
Operating lease equipment, net	8,882	8,573
Other equipment
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]
Operating lease equipment, net	739	750
Off-lease rail equipment
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]
Operating lease equipment, net	$ 258	$ 219