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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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