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Business Combinations - Narrative (Details) $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 19 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 01, 2022 USD ($) mi | Jul. 01, 2021 USD ($) terminalAndFacility | Jun. 30, 2022 USD ($) mi | Dec. 31, 2020 USD ($) | Jun. 30, 2022 USD ($) mi | Jun. 30, 2022 USD ($) mi | Dec. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of rail route miles | mi |  |  | 20,000 |  | 20,000 | 20,000 |
Goodwill |  |  | $ 377 |  | $ 377 | $ 377 | $ 276
Intangible assets acquired |  |  |  |  | $ 10 |  |
Pan Am Systems, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business combination, closing price | $ 601 |  |  |  |  |  |
Business combination, common stock issued | 422 |  |  |  |  |  |
Purchase price in cash paid for acquisition | 179 |  |  |  |  |  |
Payments for deposits |  |  |  | $ 30 |  |  |
Properties acquired | 536 |  |  |  |  |  |
Acquisition related costs |  |  | $ 18 |  |  | $ 29 |
Goodwill | $ 84 |  |  |  |  |  |
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 |  |  |  |  |  |
Quality Carriers, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price in cash paid for acquisition |  | $ 541 |  |  |  |  |
Cash and cash equivalents acquired |  | 3 |  |  |  |  |
Goodwill |  | 213 |  |  |  |  |
Intangible assets acquired |  | 180 |  |  |  |  |
Quality Carriers, Inc. | Customer Relationships |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  | $ 150 |  |  |  |  |
Amortization period of intangible assets acquired |  | 20 years |  |  |  |  |
Quality Carriers, Inc. | Trade Names |  |  |  |  |  |  |
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 |  |  |  |  |

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