Business Combinations - Narrative (Details) $ in Millions		12 Months Ended
	Jul. 01, 2021 USD ($) terminalAndFacility	Dec. 31, 2021 USD ($) mi	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Nov. 30, 2020 mi
Business Acquisition [Line Items]
Cash paid for acquisition, net of cash acquired		$ 541	$ 0	$ 0
Number of rail route miles | mi		19,500
Quality Carriers, Inc.
Business Acquisition [Line Items]
Cash paid for acquisition	$ 544
Cash paid for acquisition, net of cash acquired	3
Cash and cash equivalents acquired	3
Properties acquired	225
Acquisition related costs	$ 17
Quality Carriers, Inc. | Quality Carriers, Inc. | United States, Canada and Mexico
Business Acquisition [Line Items]
Number of terminals and facilities (over) | terminalAndFacility	100
Pan Am Systems, Inc. | Pan Am Systems, Inc.
Business Acquisition [Line Items]
Number of rail route miles | mi					1,200
Number of partial interests in rail route miles (more than) | mi					600