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financial instruments - Liquidity risk (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Liquidity risk    
Total $ 24,205 $ 22,478
Debt or equity securities pursuant to a shelf prospectus expiring June, 2020    
Liquidity risk    
Debt or equity securities that may be offered pursuant to a shelf prospectus 2,500  
Debt or equity securities pursuant to a shelf prospectus expiring April, 2018    
Liquidity risk    
Debt or equity securities that may be offered pursuant to a shelf prospectus   1,200
Non-interest bearing financial liabilities    
Liquidity risk    
Contractual maturities, non-derivative liabilities 2,782 2,420
Short-term borrowings    
Liquidity risk    
Contractual maturities, non-derivative liabilities 109 103
Construction credit facilities commitment    
Liquidity risk    
Contractual maturities, non-derivative liabilities 45 67
Long-term debt    
Liquidity risk    
Contractual maturities, non-derivative liabilities 21,439 19,762
Finance leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 106  
Composite long-term debt    
Liquidity risk    
Total 21,293  
Other    
Liquidity risk    
Contractual maturities, derivative liabilities 2  
First year    
Liquidity risk    
Total 3,772 4,360
First year | Non-interest bearing financial liabilities    
Liquidity risk    
Contractual maturities, non-derivative liabilities 2,372 2,232
First year | Short-term borrowings    
Liquidity risk    
Contractual maturities, non-derivative liabilities 3 103
First year | Construction credit facilities commitment    
Liquidity risk    
Contractual maturities, non-derivative liabilities 45 67
First year | Long-term debt    
Liquidity risk    
Contractual maturities, non-derivative liabilities 1,349 1,928
First year | Finance leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 55  
2 years hence    
Liquidity risk    
Total 1,867 1,573
2 years hence | Non-interest bearing financial liabilities    
Liquidity risk    
Contractual maturities, non-derivative liabilities 251 40
2 years hence | Short-term borrowings    
Liquidity risk    
Contractual maturities, non-derivative liabilities 3  
2 years hence | Long-term debt    
Liquidity risk    
Contractual maturities, non-derivative liabilities 1,567 1,531
2 years hence | Finance leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 51  
2 years hence | Other    
Liquidity risk    
Contractual maturities, derivative liabilities 1  
3 years hence    
Liquidity risk    
Total 1,766 1,501
3 years hence | Non-interest bearing financial liabilities    
Liquidity risk    
Contractual maturities, non-derivative liabilities 102 19
3 years hence | Short-term borrowings    
Liquidity risk    
Contractual maturities, non-derivative liabilities 103  
3 years hence | Long-term debt    
Liquidity risk    
Contractual maturities, non-derivative liabilities 1,567 1,480
4 years hence    
Liquidity risk    
Total 2,099 1,577
4 years hence | Non-interest bearing financial liabilities    
Liquidity risk    
Contractual maturities, non-derivative liabilities 18 95
4 years hence | Long-term debt    
Liquidity risk    
Contractual maturities, non-derivative liabilities 2,086 1,480
4 years hence | Other    
Liquidity risk    
Contractual maturities, derivative liabilities 1  
5 years hence    
Liquidity risk    
Total 899 1,933
5 years hence | Non-interest bearing financial liabilities    
Liquidity risk    
Contractual maturities, non-derivative liabilities 19 18
5 years hence | Long-term debt    
Liquidity risk    
Contractual maturities, non-derivative liabilities 886 1,913
5 years hence and 10 years before    
Liquidity risk    
Total 6,190 5,900
5 years hence and 10 years before | Non-interest bearing financial liabilities    
Liquidity risk    
Contractual maturities, non-derivative liabilities 20 16
5 years hence and 10 years before | Long-term debt    
Liquidity risk    
Contractual maturities, non-derivative liabilities 6,240 5,796
Thereafter    
Liquidity risk    
Total 7,612 5,634
Thereafter | Long-term debt    
Liquidity risk    
Contractual maturities, non-derivative liabilities 7,744 5,634
Currency risk related to long-term debt | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (5,138) (2,955)
Amounts to be exchanged, Pay 4,886 3,069
Currency risk related to long-term debt | Composite long-term debt    
Liquidity risk    
Total 21,293 19,876
Currency risk related to long-term debt | First year | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (877) (1,188)
Amounts to be exchanged, Pay 851 1,206
Currency risk related to long-term debt | 2 years hence | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (95) (44)
Amounts to be exchanged, Pay 89 46
Currency risk related to long-term debt | 3 years hence | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (95) (44)
Amounts to be exchanged, Pay 89 46
Currency risk related to long-term debt | 4 years hence | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (95) (44)
Amounts to be exchanged, Pay 89 46
Currency risk related to long-term debt | 5 years hence | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (95) (44)
Amounts to be exchanged, Pay 89 46
Currency risk related to long-term debt | 5 years hence and 10 years before | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (1,917) (1,591)
Amounts to be exchanged, Pay 1,847 1,679
Currency risk related to long-term debt | Thereafter | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (1,964)  
Amounts to be exchanged, Pay 1,832  
Currency risk related to foreign currency transactions | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (542) (545)
Amounts to be exchanged, Pay 516 557
Currency risk related to foreign currency transactions | First year | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (542) (545)
Amounts to be exchanged, Pay $ 516 $ 557