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Joint Arrangements - Joint Ventures and Associates (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Joint Ventures And Associates [Line Items] |  |
Net earnings (loss) | CAD 4,458.0 | CAD 445.0
Other comprehensive income | (167.0) | (282.0)
Total Comprehensive Income | 4,291.0 | 163.0
Joint ventures |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |
Net earnings (loss) | 1.0 | 1.0
Total Comprehensive Income | 1.0 | 1.0
Carrying amount as at December 31 | 51.0 | 45.0
Associates |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |
Net earnings (loss) | (3.0) | (3.0)
Total Comprehensive Income | (3.0) | (3.0)
Carrying amount as at December 31 | CAD 89.0 | CAD 93.0

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