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advance billings and customer deposits - Reconciliation of contract liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
advance billings and customer deposits    
Gross contract liabilities $ 735 $ 718
Reclassification to contract assets for contracts with contract liabilities less than contract assets (133) (166)
Reclassification from contract assets for contracts with contract assets less than contract liabilities (10) (7)
Contract liabilities $ 592 $ 545