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real estate joint ventures - Investment activity (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Related to real estate joint ventures' statements of income and other comprehensive income        
Comprehensive income (loss) attributable to us $ (464) $ (428) $ (821) $ (900)
Real estate joint ventures        
Related to real estate joint ventures' statements of income and other comprehensive income        
Comprehensive income (loss) attributable to us (1) 2 (1) 3
Items not affecting currently reported cash flows        
Recognition of gain initially deferred on our real estate initially contributed   1   1
Construction credit facilities financing costs charged by us and other     1  
Cash flows in the current reporting period        
Construction credit facilities amounts advanced 7 8 13 13
Financing costs paid to us     (1)  
Funds repaid to us and earnings distributed (1) (1) (1) (4)
Net increase (decrease) 5 10 11 13
Real estate joint ventures carrying amounts        
Balance, beginning of period 68 54 62 51
Balance, end of period 73 64 73 64
Real estate joint ventures | Equity        
Related to real estate joint ventures' statements of income and other comprehensive income        
Comprehensive income (loss) attributable to us (1) 2 (1) 3
Items not affecting currently reported cash flows        
Recognition of gain initially deferred on our real estate initially contributed   1   1
Cash flows in the current reporting period        
Funds repaid to us and earnings distributed (1) (1) (1) (4)
Net increase (decrease) (2) 2 (2)  
Real estate joint ventures carrying amounts        
Balance, beginning of period 15 28 15 30
Balance, end of period 13 30 13 30
Real estate joint ventures | Loans and receivables        
Items not affecting currently reported cash flows        
Construction credit facilities financing costs charged by us and other     1  
Cash flows in the current reporting period        
Construction credit facilities amounts advanced 7 8 13 13
Financing costs paid to us     (1)  
Net increase (decrease) 7 8 13 13
Real estate joint ventures carrying amounts        
Balance, beginning of period 53 26 47 21
Balance, end of period 60 34 60 34
TELUS Garden real estate joint venture        
Real estate joint ventures carrying amounts        
Related party revenue from TELUS Garden office tenancy $ 3 $ 3 $ 6 $ 6