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Risk Management Activities - Maturity (Details) - CAD CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of financial liabilities [line items] |  |
Accounts payable and accrued liabilities | CAD 595 | CAD 413
Borrowings | 3,707 | 4,361
Finance lease liabilities | 69 | 73
Dividends payable (Note 23) | 34 | CAD 54
Liabilities | 4,944 |
Within one year |  |
Disclosure of financial liabilities [line items] |  |
Liabilities | 1,436 |
2019 |  |
Disclosure of financial liabilities [line items] |  |
Liabilities | 544 |
2020 |  |
Disclosure of financial liabilities [line items] |  |
Liabilities | 522 |
2021 |  |
Disclosure of financial liabilities [line items] |  |
Liabilities | 107 |
2022 |  |
Disclosure of financial liabilities [line items] |  |
Liabilities | 577 |
More than five years |  |
Disclosure of financial liabilities [line items] |  |
Liabilities | 1,758 |
Gross carrying amount |  |
Disclosure of financial liabilities [line items] |  |
Accounts payable and accrued liabilities | 595 |
Borrowings | 3,664 |
Derivative financial liabilities | (34) |
Finance lease liabilities | 69 |
Interest income on debt instruments held | 1,344 |
Dividends payable (Note 23) | 34 |
Gross carrying amount | Within one year |  |
Disclosure of financial liabilities [line items] |  |
Accounts payable and accrued liabilities | 595 |
Borrowings | 730 |
Derivative financial liabilities | (37) |
Finance lease liabilities | 18 |
Interest income on debt instruments held | 177 |
Dividends payable (Note 23) | 34 |
Gross carrying amount | 2019 |  |
Disclosure of financial liabilities [line items] |  |
Accounts payable and accrued liabilities | 0 |
Borrowings | 469 |
Derivative financial liabilities | 1 |
Finance lease liabilities | 15 |
Interest income on debt instruments held | 153 |
Dividends payable (Note 23) | 0 |
Gross carrying amount | 2020 |  |
Disclosure of financial liabilities [line items] |  |
Accounts payable and accrued liabilities | 0 |
Borrowings | 472 |
Derivative financial liabilities | 1 |
Finance lease liabilities | 12 |
Interest income on debt instruments held | 125 |
Dividends payable (Note 23) | 0 |
Gross carrying amount | 2021 |  |
Disclosure of financial liabilities [line items] |  |
Accounts payable and accrued liabilities | 0 |
Borrowings | 100 |
Derivative financial liabilities | 1 |
Finance lease liabilities | 6 |
Interest income on debt instruments held | 102 |
Dividends payable (Note 23) | 0 |
Gross carrying amount | 2022 |  |
Disclosure of financial liabilities [line items] |  |
Accounts payable and accrued liabilities | 0 |
Borrowings | 581 |
Derivative financial liabilities | 0 |
Finance lease liabilities | 4 |
Interest income on debt instruments held | 95 |
Dividends payable (Note 23) | 0 |
Gross carrying amount | More than five years |  |
Disclosure of financial liabilities [line items] |  |
Accounts payable and accrued liabilities | 0 |
Borrowings | 1,312 |
Derivative financial liabilities | 0 |
Finance lease liabilities | 14 |
Interest income on debt instruments held | 692 |
Dividends payable (Note 23) | 0 |
Commodity risk management | Gross carrying amount |  |
Disclosure of financial liabilities [line items] |  |
Derivative financial liabilities | (728) |
Commodity risk management | Gross carrying amount | Within one year |  |
Disclosure of financial liabilities [line items] |  |
Derivative financial liabilities | (81) |
Commodity risk management | Gross carrying amount | 2019 |  |
Disclosure of financial liabilities [line items] |  |
Derivative financial liabilities | (94) |
Commodity risk management | Gross carrying amount | 2020 |  |
Disclosure of financial liabilities [line items] |  |
Derivative financial liabilities | (88) |
Commodity risk management | Gross carrying amount | 2021 |  |
Disclosure of financial liabilities [line items] |  |
Derivative financial liabilities | (102) |
Commodity risk management | Gross carrying amount | 2022 |  |
Disclosure of financial liabilities [line items] |  |
Derivative financial liabilities | (103) |
Commodity risk management | Gross carrying amount | More than five years |  |
Disclosure of financial liabilities [line items] |  |
Derivative financial liabilities | CAD (260) |

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