v3.22.4
Share Capital - Schedule of Common Shares Issued (Detail)
$ in Millions
 3 Months Ended
Jan. 31, 2023
CAD ($)
shares
Oct. 31, 2022
CAD ($)
shares
Jan. 31, 2022
CAD ($)
shares
Disclosure of classes of share capital [line items]      
Balance at beginning of period $ 50,382    
Balance at end of period $ 49,908 $ 50,382 $ 47,292
Common shares [member]      
Disclosure of classes of share capital [line items]      
Beginning balance, Number of shares | shares 906,040,097 904,691,173 901,655,952
Equity-settled share-based compensation plans, Number of shares | shares 131,331 48,754 1,076,678
Shareholder investment plan, Number of shares | shares 4,746,425 669,608 453,030
Employee share purchase plan, Number of shares | shares 740,514 593,192 532,740
Number of shares issued, Number of shares | shares 911,658,367 906,002,727 903,718,400
Purchase of common shares for cancellation, Number of shares | shares     (1,800,000)
Treasury shares, Number of shares | shares (29,571) 37,370 4,230
Ending balance, Number of shares | shares 911,628,796 906,040,097 901,922,630
Balance at beginning of period $ 14,726 $ 14,643 $ 14,351
Equity-settled share-based compensation plans 6 3 59
Shareholder investment plan, Amount 272 40 36
Employee share purchase plan, Amount 44 38 40
Number of shares issued, Amount 15,048 14,724 14,486
Purchase of common shares for cancellation, Amount 0 0 (29)
Treasury shares, Amount (2) 2 0
Balance at end of period $ 15,046 $ 14,726 $ 14,457