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Adoption of IFRS 16 - Impacts of Adopting IFRS 16 (Details) - CAD ($) $ in Millions | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of initial application of standards or interpretations [line items] |  |  |
Prepaid expenses | $ 349 | $ 189 | $ 244
Other current assets | 189 | 338 | 329
Property, plant and equipment | 27,415 | 27,101 | 24,844
Other non-current assets | 700 | 864 | 847
Trade payables and other liabilities | 3,720 | 3,931 | 3,941
Debt due within one year | 5,676 | 4,938 | 4,645
Long-term debt | 21,949 | 21,771 | 19,760
Deferred tax liabilities | 3,146 | 3,156 | 3,163
Other non-current liabilities | 938 | 958 | 997
Deficit | (5,195) | (4,956) | (4,937)
Non-controlling interest | $ 329 | 325 | 326
IFRS 16 |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |
Deficit |  | (19) |
IFRS 16 | December 31, 2018 as reported |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |
Prepaid expenses |  |  | 244
Other current assets |  |  | 329
Property, plant and equipment |  |  | 24,844
Other non-current assets |  |  | 847
Trade payables and other liabilities |  |  | 3,941
Debt due within one year |  |  | 4,645
Long-term debt |  |  | 19,760
Deferred tax liabilities |  |  | 3,163
Other non-current liabilities |  |  | 997
Deficit |  |  | (4,937)
Non-controlling interest |  |  | $ 326
IFRS 16 | IFRS 16 impacts |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |
Prepaid expenses |  | (55) |
Other current assets |  | 9 |
Property, plant and equipment |  | 2,257 |
Other non-current assets |  | 17 |
Trade payables and other liabilities |  | (10) |
Debt due within one year |  | 293 |
Long-term debt |  | 2,011 |
Deferred tax liabilities |  | (7) |
Other non-current liabilities |  | (39) |
Deficit |  | (19) |
Non-controlling interest |  | $ (1) |

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