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Other Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Long-term advances from Conrail (Note 7)	$ 534	$ 534
Defined benefit plan, obligations (Note 13)	252	279
Non-current operating lease liability (Note 11)	191	287
Non-current Eastern Ohio incident liability (Note 18)	103	118
Deferred compensation	90	80
Other	228	148
Total	1,760	1,839
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, obligations (Note 13)	252	279
Casualty and other claims (Note 18)	229	221
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, obligations (Note 13)	$ 133	$ 172

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