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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) $ (2,379) $ 2,194 $ (2,669)
Items That Will Not be Reclassified to Profit or Loss:      
Actuarial Gain (Loss) Relating to Pension and Other Post-Retirement Benefits (8) 5 (3)
Change in the Fair Value of Equity Instruments at FVOCI [1]   12 1
Items That May be Reclassified to Profit or Loss:      
Foreign Currency Translation Adjustment (44) (228) 397
Total Other Comprehensive Income (Loss), Net of Tax (52) (211) 395
Comprehensive Income (Loss) $ (2,431) $ 1,983 $ (2,274)
[1] Fair value through other comprehensive income (loss) (“FVOCI”).