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Other Liabilities and Deferred Credits (Tables)
 12 Months Ended
Dec. 31, 2020
Other Liabilities Disclosure [Abstract]  
Other liabilities and deferred credits
In millionsDecember 31,20202019
Personal injury and other claims provisions (Note 21) (1)
$238 $261 
Contract liabilities (Note 4) (1)
85 161 
Stock-based compensation liability (Note 19)
14 16 
Environmental provisions (Note 21) (1)
13 19 
Deferred credits and other184 177 
Total other liabilities and deferred credits$534 $634 
(1)    See Note 14 – Accounts payable and other for the related current portion.