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real estate joint ventures - Investment activity (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Related to real estate joint ventures' statements of income and other comprehensive income    
Comprehensive income (loss) attributable to us $ (1,898) $ (1,395)
Real estate joint ventures    
Related to real estate joint ventures' statements of income and other comprehensive income    
Comprehensive income (loss) attributable to us 171 2
Items not affecting currently reported cash flows    
Recognition of gain initially deferred on our real estate initially contributed   1
Construction credit facilities financing costs charged by us and other 3  
Cash flows in the current reporting period    
Construction credit facilities amounts advanced 22 26
Financing costs paid to us (3)  
Funds repaid to us and earnings distributed (181) (18)
Net increase (decrease) 12 11
Real estate joint ventures carrying amounts    
Balance, beginning of period 62 51
Balance, end of period 74 62
Real estate joint ventures | Equity    
Related to real estate joint ventures' statements of income and other comprehensive income    
Comprehensive income (loss) attributable to us 171 2
Items not affecting currently reported cash flows    
Recognition of gain initially deferred on our real estate initially contributed   1
Cash flows in the current reporting period    
Funds repaid to us and earnings distributed (181) (18)
Net increase (decrease) (10) (15)
Real estate joint ventures carrying amounts    
Balance, beginning of period 15 30
Balance, end of period 5 15
Real estate joint ventures | Loans and receivables    
Items not affecting currently reported cash flows    
Construction credit facilities financing costs charged by us and other 3  
Cash flows in the current reporting period    
Construction credit facilities amounts advanced 22 26
Financing costs paid to us (3)  
Net increase (decrease) 22 26
Real estate joint ventures carrying amounts    
Balance, beginning of period 47 21
Balance, end of period 69 47
TELUS Garden real estate joint venture    
Real estate joint ventures carrying amounts    
Related party revenue from TELUS Garden office tenancy $ 7 $ 12