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Consolidated Statements of Comprehensive Income (Loss) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of comprehensive income [abstract]      
Net earnings (loss) $ (435) $ 5,416 $ 2,591
Net change in derivative financial instruments designated as cash flow hedges      
Unrealized income, net of taxes of $2 million (2019 – $13 million, 2018 – $nil) 13 99 5
Reclassification to net earnings (loss), net of taxes of $2 million (2019 – $5 million, 2018 – $6 million) (15) (41) (39)
Net change in derivative financial instruments designated as cash flow hedges (2) 58 (34)
Foreign currency translation adjustment      
Translation of net investment (24) (146) 224
Other comprehensive income (loss), net of taxes (26) (88) 190
Comprehensive income (loss) $ (461) $ 5,328 $ 2,781