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Per Share Amounts - Schedule Representing Per Share Amounts (Detail) - CAD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings per share [abstract]      
Net Earnings (Loss) $ 587 $ (2,379) [1] $ 2,194 [1]
Effect of Cumulative Dividends on Preferred Shares (34) 0 0
Net Earnings (Loss) – Basic and Diluted $ 553 $ (2,379) $ 2,194
Basic – Weighted Average Number of Shares (in shares) 2,016.2 1,228.9 1,228.8
Dilutive Effect of Warrants (in shares) 27.6 0.0 0.0
Dilutive Effect of Net Settlement Rights (in shares) 1.3 0.0 0.6
Diluted – Weighted Average Number of Shares (in shares) 2,045.1 1,228.9 1,229.4
Net Earnings (Loss) Per Share — Basic (CAD per share) $ 0.27 $ (1.94) [1] $ 1.78 [1]
Net Earnings (Loss) Per Share — Diluted (CAD per share) $ 0.27 $ (1.94) [1] $ 1.78 [1]
[1] See Note 3(w) for revisions to comparative results.