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real estate joint ventures and investments in associates - Investment activity (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Related to real estate joint ventures' statements of income and other comprehensive income        
Comprehensive income (loss) $ 220 $ 144 $ 446 $ 355
Real estate joint ventures | Equity        
Related to real estate joint ventures' statements of income and other comprehensive income        
Comprehensive income (loss) (1) (1) (2) (2)
Items not affecting currently reported cash flows        
Our real estate contributed 38   114  
Deferred gain on our remaining interest in our real estate contributed (19)   (51)  
Cash flows in the current reporting period        
Funds we advanced or contributed, excluding construction credit facilities 3 1 6 2
Real estate joint ventures carrying amounts        
Balance, beginning of period 96 (8) 50 (8)
Balance, end of period 117 (8) 117 (8)
Real estate joint ventures | Loans and receivables        
Items not affecting currently reported cash flows        
Construction credit facilities financing costs charged by us 1 2 3 4
Cash flows in the current reporting period        
Financing costs paid to us (1) (2) (3) (4)
Real estate joint ventures carrying amounts        
Balance, beginning of period 94 114 94 114
Balance, end of period 94 114 94 114
TELUS Sky real estate joint venture        
Real estate joint ventures carrying amounts        
Related party revenue from TELUS Sky office tenancy $ 2 $ 2 $ 4 $ 4