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Consolidated Statements of Comprehensive Income (Loss) (unaudited) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of comprehensive income [abstract]      
Net Earnings (Loss) $ 587 $ (2,379) [1] $ 2,194 [1]
Items That Will not be Reclassified to Profit or Loss:      
Actuarial Gain (Loss) Relating to Pension and Other Post-Retirement Benefits 38 (8) 5
Change in the Fair Value of Equity Instruments at FVOCI [2] 0 0 12
Items That may be Reclassified to Profit or Loss:      
Foreign Currency Translation Adjustment (129) (44) (228)
Total Other Comprehensive Income (Loss), Net of Tax (91) (52) (211)
Comprehensive Income (Loss) $ 496 $ (2,431) $ 1,983
[1] See Note 3(w) for revisions to comparative results.
[2] Fair value through other comprehensive income (loss) (“FVOCI”).