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Other Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Non-current operating lease liability (Note 10)	$ 331	$ 344
Casualty and other claims (Note 17)	170	169
Deferred compensation	109	107
Other	153	187
Total	1,879	1,987
Pension Benefits
Schedule of Investments [Line Items]
Defined benefit plan, obligations (Note 12)	338	340
Non-current operating lease liability (Note 10)
Schedule of Investments [Line Items]
Defined benefit plan, obligations (Note 12)	244	306
Conrail
Schedule of Investments [Line Items]
Long-term advances from Conrail (Note 6)	$ 534	$ 534

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