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Share Capital - Outstanding Common Shares (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 23, 2022 CAD ($) shares | Dec. 31, 2021 CAD ($) shares | Dec. 31, 2020 CAD ($) shares | Dec. 31, 2019 CAD ($) shares
Reconciliation of number of shares outstanding [abstract] |  |  |  |
Balance – beginning of year | $ 36,945 | $ 32,380 | $ 34,991 |
Issued upon exercise of stock options (in shares) | shares |  | 18,147,000 | 3,979,000 |
Purchase of common shares under Normal Course Issuer Bid (In shares) | shares | (10,500,000) | (33,644,400) |  |
Purchase of common shares under Normal Course Issuer Bid | $ (680) | $ (1,581) |  |
Balance – end of year |  | 36,945 | $ 32,380 | $ 34,991
Share capital |  |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |  |
Balance – beginning of year | $ 10,168 | 9,606 | 9,533 | 9,323
Issued upon exercise of stock options |  | 707 |  | 360
Previously recognized liability on stock options exercised for common shares |  | 139 |  | 53
Purchase of common shares under Normal Course Issuer Bid |  |  |  | (203)
Balance – end of year |  | $ 10,168 | $ 9,606 | $ 9,533
Ordinary shares | Share capital |  |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |  |
Balance - beginning of year (in shares) | shares | 1,168,369,000 | 1,183,866,000 | 1,186,857,000 |
Balance – beginning of year | $ 10,168 | $ 9,606 | $ 9,533 |
Issued upon exercise of stock options (in shares) | shares |  | 18,147,000 | 3,979,000 |
Issued upon exercise of stock options |  | $ 707 | $ 108 |
Previously recognized liability on stock options exercised for common shares |  | $ 139 | $ 21 |
Purchase of common shares under Normal Course Issuer Bid (In shares) | shares |  | (33,644,000) | (6,970,000) |
Purchase of common shares under Normal Course Issuer Bid |  | $ (284) | $ (56) |
Balance - end of year (in shares) | shares |  | 1,168,369,000 | 1,183,866,000 | 1,186,857,000
Balance – end of year |  | $ 10,168 | $ 9,606 | $ 9,533

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