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Consolidated Statements of Comprehensive Income (Loss) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement of comprehensive income [abstract]      
Net earnings (loss) $ 10,937 $ 7,664 $ (435)
Net change in derivative financial instruments designated as cash flow hedges      
Unrealized income, net of taxes of $1 million (2021 – $2 million, 2020 – $2 million) 4 15 13
Reclassification to net earnings (loss), net of taxes of $1 million (2021 – $1 million, 2020 – $2 million) (6) (7) (15)
Net change in derivative financial instruments designated as cash flow hedges (2) 8 (2)
Foreign currency translation adjustment      
Translation of net investment 212 (17) (24)
Other comprehensive income (loss), net of taxes 210 (9) (26)
Comprehensive income (loss) $ 11,147 $ 7,655 $ (461)