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Joint Arrangements - Joint Ventures and Associates (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Joint Ventures And Associates [Line Items] |  |
Net earnings (loss) | $ 3,293 | $ 4,458
Other comprehensive income | 370 | (167)
Total Comprehensive Income | 3,663 | 4,291
Joint ventures |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |
Net earnings (loss) | 11 | 1
Total Comprehensive Income | 11 | 1
Carrying amount as at December 31 | 75 | 51
Associates |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |
Net earnings (loss) | (19) | (3)
Total Comprehensive Income | (19) | (3)
Carrying amount as at December 31 | $ 110 | $ 89

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