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Acquisition of Assets of Cincinnati Southern Railway (Details) $ in Millions		3 Months Ended	9 Months Ended		12 Months Ended
	Mar. 15, 2024 USD ($) mi	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Asset Acquisition [Line Items]
Lease expense		$ 7	$ 5	$ 19
March 2024 Railway Purchase
Asset Acquisition [Line Items]
Number of miles railway line purchased | mi	337
Personal property transaction amount	$ 1,700
Payments to acquire productive assets					$ 100

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Amount of consideration transferred in asset acquisition. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer.

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Amount of operating lease expense. Excludes sublease income.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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