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Business Combinations - Narrative (Details) $ in Millions		3 Months Ended	9 Months Ended
	Jul. 01, 2021 USD ($)	Sep. 30, 2021 USD ($) mi	Sep. 30, 2021 USD ($) mi	May 12, 2021 terminalAndFacility	Nov. 30, 2020 mi
Business Acquisition [Line Items]
Number of rail route miles | mi		19,500	19,500
Quality Carriers, Inc.
Business Acquisition [Line Items]
Purchase price in cash paid for acquisition	$ 546
Goodwill	200
Cash and cash equivalents acquired	3
Properties acquired	225
Intangible assets acquired	190
Acquisition related costs		$ 12	$ 16
Quality Carriers, Inc. | Customer Lists
Business Acquisition [Line Items]
Intangible assets acquired	$ 160
Amortization period of intangible assets acquired	20 years
Quality Carriers, Inc. | Trademarks
Business Acquisition [Line Items]
Intangible assets acquired	$ 30
Amortization period of intangible assets acquired	15 years
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

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