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Properties - Narrative (Details) $ in Millions				1 Months Ended	12 Months Ended			40 Months Ended
	Sep. 06, 2024 USD ($)	Sep. 05, 2024 USD ($)	Mar. 15, 2024 USD ($) mi	Nov. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2027 USD ($)
Property, Plant and Equipment [Line Items]
Operating lease expense					$ 5	$ 26	$ 25
Property sales and other transactions					558	86	263
Interest costs incurred on debt					833	743	708
Interest costs capitalized					$ 26	$ 21	$ 16
March 2024 Railway Purchase
Property, Plant and Equipment [Line Items]
Number of miles railway line purchased | mi			337
Personal property transaction amount			$ 1,700
Virginia Passenger Rail Authority | Railway Line
Property, Plant and Equipment [Line Items]
Property sales and other transactions		$ 315
Gain (loss) on disposition of property plant equipment		$ 323		$ 53
Virginia Passenger Rail Authority | Scenario, Forecast | Railway Line
Property, Plant and Equipment [Line Items]
Property sales and other transactions								$ 357
City Of Charlotte | Railway Line
Property, Plant and Equipment [Line Items]
Property sales and other transactions	$ 74
Gain (loss) on disposition of property plant equipment	$ 57

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