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long-term debt - Long-term debt maturities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments - Finance leases $ 102  
Total 24,205 $ 22,478
Long-term debt    
Long-term debt maturities    
Undiscounted contractual maturities $ 21,439 19,762
Finance leases    
Long-term debt maturities    
Repayment term of finance lease 2 years  
Weighted average interest rate 2.87%  
Composite long-term debt    
Long-term debt maturities    
Total $ 14,115  
Total 7,178  
Total 21,293  
U.S. Dollars | Long-term debt    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments 3,726  
Future cash outflows in respect of associated interest and like carrying costs 1,906  
Undiscounted contractual maturities 5,632  
U.S. Dollars | Derivative Liability Receive    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments - Derivative Liabilities (3,300)  
Future cash outflows in respect of associated interest and like carrying costs - Derivative Liabilities (1,838)  
Undiscounted contractual maturities - Derivative Liabilities, Receive (5,138)  
U.S. Dollars | Derivative Liability Pay    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments - Derivative Liabilities 3,188  
Future cash outflows in respect of associated interest and like carrying costs - Derivative Liabilities 1,698  
Undiscounted contractual maturities - Derivative Liabilities, Pay 4,886  
U.S. Dollars | Composite long-term debt    
Long-term debt maturities    
Total 3,614  
Total 1,766  
Total 5,380  
Cdn. Dollars    
Long-term debt maturities    
Total 10,501  
Total 5,412  
Total 15,913  
Cdn. Dollars | Long-term debt    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments 10,399  
Future cash outflows in respect of associated interest and like carrying costs 5,408  
Undiscounted contractual maturities 15,807  
Cdn. Dollars | Finance leases    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments - Finance leases 102  
Future cash outflows in respect of associated interest and like carrying costs - Finance leases 4  
Undiscounted contractual maturities - Finance leases 106  
First year    
Long-term debt maturities    
Total 3,772 4,360
First year | Long-term debt    
Long-term debt maturities    
Undiscounted contractual maturities 1,349 1,928
First year | Composite long-term debt    
Long-term debt maturities    
Total 815  
First year | U.S. Dollars | Long-term debt    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments 784  
First year | U.S. Dollars | Derivative Liability Receive    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments - Derivative Liabilities (776)  
First year | U.S. Dollars | Derivative Liability Pay    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments - Derivative Liabilities 755  
First year | U.S. Dollars | Composite long-term debt    
Long-term debt maturities    
Total 763  
First year | Cdn. Dollars    
Long-term debt maturities    
Total 52  
First year | Cdn. Dollars | Finance leases    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments - Finance leases 52  
2 years hence    
Long-term debt maturities    
Total 1,867 1,573
2 years hence | Long-term debt    
Long-term debt maturities    
Undiscounted contractual maturities 1,567 1,531
2 years hence | Composite long-term debt    
Long-term debt maturities    
Total 1,058  
2 years hence | U.S. Dollars | Long-term debt    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments 8  
2 years hence | U.S. Dollars | Composite long-term debt    
Long-term debt maturities    
Total 8  
2 years hence | Cdn. Dollars    
Long-term debt maturities    
Total 1,050  
2 years hence | Cdn. Dollars | Long-term debt    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments 1,000  
2 years hence | Cdn. Dollars | Finance leases    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments - Finance leases 50  
3 years hence    
Long-term debt maturities    
Total 1,766 1,501
3 years hence | Long-term debt    
Long-term debt maturities    
Undiscounted contractual maturities 1,567 1,480
3 years hence | Composite long-term debt    
Long-term debt maturities    
Total 1,083  
3 years hence | U.S. Dollars | Long-term debt    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments 8  
3 years hence | U.S. Dollars | Composite long-term debt    
Long-term debt maturities    
Total 8  
3 years hence | Cdn. Dollars    
Long-term debt maturities    
Total 1,075  
3 years hence | Cdn. Dollars | Long-term debt    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments 1,075  
4 years hence    
Long-term debt maturities    
Total 2,099 1,577
4 years hence | Long-term debt    
Long-term debt maturities    
Undiscounted contractual maturities 2,086 1,480
4 years hence | Composite long-term debt    
Long-term debt maturities    
Total 1,651  
4 years hence | U.S. Dollars | Long-term debt    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments 402  
4 years hence | U.S. Dollars | Composite long-term debt    
Long-term debt maturities    
Total 402  
4 years hence | Cdn. Dollars    
Long-term debt maturities    
Total 1,249  
4 years hence | Cdn. Dollars | Long-term debt    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments 1,249  
5 years hence    
Long-term debt maturities    
Total 899 1,933
5 years hence | Long-term debt    
Long-term debt maturities    
Undiscounted contractual maturities 886 1,913
5 years hence | Composite long-term debt    
Long-term debt maturities    
Total 500  
5 years hence | Cdn. Dollars    
Long-term debt maturities    
Total 500  
5 years hence | Cdn. Dollars | Long-term debt    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments 500  
5 years hence and 10 years before    
Long-term debt maturities    
Total 6,190 5,900
5 years hence and 10 years before | Long-term debt    
Long-term debt maturities    
Undiscounted contractual maturities 6,240 5,796
5 years hence and 10 years before | Composite long-term debt    
Long-term debt maturities    
Total 4,759  
5 years hence and 10 years before | U.S. Dollars | Long-term debt    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments 1,501  
5 years hence and 10 years before | U.S. Dollars | Derivative Liability Receive    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments - Derivative Liabilities (1,501)  
5 years hence and 10 years before | U.S. Dollars | Derivative Liability Pay    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments - Derivative Liabilities 1,459  
5 years hence and 10 years before | U.S. Dollars | Composite long-term debt    
Long-term debt maturities    
Total 1,459  
5 years hence and 10 years before | Cdn. Dollars    
Long-term debt maturities    
Total 3,300  
5 years hence and 10 years before | Cdn. Dollars | Long-term debt    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments 3,300  
Thereafter    
Long-term debt maturities    
Total 7,612 5,634
Thereafter | Long-term debt    
Long-term debt maturities    
Undiscounted contractual maturities 7,744 $ 5,634
Thereafter | Composite long-term debt    
Long-term debt maturities    
Total 4,249  
Thereafter | U.S. Dollars | Long-term debt    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments 1,023  
Thereafter | U.S. Dollars | Derivative Liability Receive    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments - Derivative Liabilities (1,023)  
Thereafter | U.S. Dollars | Derivative Liability Pay    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments - Derivative Liabilities 974  
Thereafter | U.S. Dollars | Composite long-term debt    
Long-term debt maturities    
Total 974  
Thereafter | Cdn. Dollars    
Long-term debt maturities    
Total 3,275  
Thereafter | Cdn. Dollars | Long-term debt    
Long-term debt maturities    
Future cash outflows in respect of composite long-term debt principal repayments $ 3,275