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real estate joint ventures and investment in associate - Investment activity (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Related to real estate joint ventures' statements of income and other comprehensive income |  |
Comprehensive income (loss) attributable to us | $ 893 | $ 1,516
Real estate joint ventures |  |
Related to real estate joint ventures' statements of income and other comprehensive income |  |
Comprehensive income (loss) attributable to us | 14 | 4
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 | 35
Financing costs paid to us | (4) | (4)
Funds we advanced or contributed, excluding construction credit facilities | 17 |
Funds repaid to us and earnings distributed | (1) | (3)
Net increase (decrease) | 12 | 28
Real estate joint ventures carrying amounts |  |
Balance, beginning of period | 102 | 74
Valuation provision | (11) |
Balance, end of period | 103 | 102
Real estate joint ventures | Equity |  |
Related to real estate joint ventures' statements of income and other comprehensive income |  |
Comprehensive income (loss) attributable to us | 14 | 4
Cash flows in the current reporting period |  |
Funds we advanced or contributed, excluding construction credit facilities | 17 |
Funds repaid to us and earnings distributed | (1) | (3)
Net increase (decrease) | 2 | (7)
Real estate joint ventures carrying amounts |  |
Balance, beginning of period | (2) | 5
Valuation provision | (11) |
Balance, end of period | (11) | (2)
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 | 35
Financing costs paid to us | (4) | (4)
Net increase (decrease) | 10 | 35
Real estate joint ventures carrying amounts |  |
Balance, beginning of period | 104 | 69
Balance, end of period | $ 114 | $ 104

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