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Consolidated Statements of Comprehensive Income (Parenthetical) - CAD
CAD in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Statement of comprehensive income [abstract]    
Currency translation differences, taxes CAD (46) CAD (27)
Change in fair value of available-for-sale financial instruments, taxes 2 (2)
Remeasurements of retirement benefit plans,taxes CAD (55) CAD (7)