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real estate joint ventures and investment in associate - Investment activity (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Related to real estate joint ventures' statements of income and other comprehensive income    
Comprehensive income (loss) attributable to us $ (2,341) $ (893)
Real estate joint ventures    
Related to real estate joint ventures' statements of income and other comprehensive income    
Comprehensive income (loss) attributable to us (3) (14)
Items not affecting currently reported cash flows    
Construction credit facilities financing costs charged by us 4 4
Cash flows in the current reporting period    
Construction credit facilities Amounts advanced   10
Financing costs paid to us (4) (4)
Funds we advanced or contributed, excluding construction credit facilities 10 17
Funds repaid to us and earnings distributed   (1)
Net increase (decrease) 7 12
Real estate joint ventures carrying amounts    
Balance, beginning of period 103 102
Valuation provision (4) (11)
Balance, end of period 106 103
Real estate joint ventures | Equity    
Related to real estate joint ventures' statements of income and other comprehensive income    
Comprehensive income (loss) attributable to us (3) (14)
Cash flows in the current reporting period    
Funds we advanced or contributed, excluding construction credit facilities 10 17
Funds repaid to us and earnings distributed   (1)
Net increase (decrease) 7 2
Real estate joint ventures carrying amounts    
Balance, beginning of period (11) (2)
Valuation provision (4) (11)
Balance, end of period (8) (11)
Real estate joint ventures | Loans and receivables    
Items not affecting currently reported cash flows    
Construction credit facilities financing costs charged by us 4 4
Cash flows in the current reporting period    
Construction credit facilities Amounts advanced   10
Financing costs paid to us (4) (4)
Net increase (decrease)   10
Real estate joint ventures carrying amounts    
Balance, beginning of period 114 104
Balance, end of period 114 114
TELUS Sky real estate joint venture    
Real estate joint ventures carrying amounts    
Related party revenue from TELUS Sky office tenancy $ 8