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Other Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Non-current operating lease liability (Note 10)	$ 344	$ 441
Casualty and other claims (Note 17)	169	171
Deferred compensation	107	104
Other	187	159
Total	1,987	1,744
Conrail Inc.
Schedule of Investments [Line Items]
Long-term advances from Conrail (Note 6)	534	280
Pension Plan
Schedule of Investments [Line Items]
Defined benefit pension plan, liabilities, noncurrent (Note 12)	340	302
Other Postretirement Benefits Plan
Schedule of Investments [Line Items]
Defined benefit pension plan, liabilities, noncurrent (Note 12)	$ 306	$ 287

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