Leases - Schedule of Net Book Value of Assets Subject to Leases (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]
Lessor asset under operating lease, accumulated depreciation	$ 67
Operating lease equipment, net	7,972	$ 0	$ 0
Railcars and locomotives
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]
Operating lease equipment, net	7,251
Other equipment
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]
Operating lease equipment, net	721
Off-lease rail equipment
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]
Operating lease equipment, net	$ 504