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Significant Events - Changes in Internal Capitalization of U.S. Entities (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about hedges [line items] |  |  |  |
Gains (losses) on hedges of net investments in foreign operations, net of tax | [1] | $ (41) | $ 50 | $ 18
[1] | (5) Net of income tax of nil for the year ended Dec. 31, 2018 (2017 - 2 million expense, 2016 - 5 million expense).

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