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Non-Operating Income (Expense) (Tables) | 12 Months Ended
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Dec. 31, 2018
Text block [abstract] |
Schedule of Non-Operating Income (Expense) |
(CAD$ in millions) |  | 2018 |  |  | 2017 |
Foreign exchange gains |  | $ | 16 |  |  | $ | 5 |
Gain (loss) on debt prepayment options (Note 28(b)) |  |  | (42 | ) |  |  | 51 |
Gain on sale of investments |  |  | — |  |  |  | 9 |
Loss on debt repurchases (Note 19(a) and Note 19(b)) |  |  | (26 | ) |  |  | (216 | )
|  | $ | (52 | ) |  | $ | (151 | )

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