Current Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Accounts and wages payable	$ 850	$ 552
Casualty and other claims (Note 17)	166	182
Vacation liability	119	121
Other	104	105
Total	1,351	1,016
Interest payable	150	141
Current operating lease liability (Note 10)	82	89
Other	60	53
Total	312	302
Pension Benefits
Related Party Transaction [Line Items]
Pension benefit obligations (Note 12)	20	19
Conrail
Related Party Transaction [Line Items]
Due to Conrail (Note 6)	$ 112	$ 56

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