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Share Capital - Summary of Share Capital (Detail) - CAD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Classes Of Share Capital [Abstract]    
Outstanding, Beginning of Year 1,228,828 1,228,790
Common Shares Issued Under Stock Option Plan (Note 32) 42 38
Outstanding, End of Year 1,228,870 1,228,828
Outstanding, Beginning of Year $ 11,040 $ 11,040
Common Shares Issued Under Stock Option Plan (Note 32) 0 0
Outstanding, End of Year $ 11,040 $ 11,040