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Share Capital - Outstanding Common Shares (Details) $ in Millions | 2 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 27, 2024 CAD ($) shares | Dec. 31, 2023 CAD ($) shares | Dec. 31, 2022 CAD ($) shares | Dec. 31, 2021 CAD ($) shares
Reconciliation of number of shares outstanding [abstract] |  |  |  |
Balance – beginning of year | $ 39,832 | $ 38,175 | $ 36,945 |
Issued upon exercise of stock options (in shares) | shares |  | 9,822,000 | 11,605,000 |
Purchase of common shares under Normal Course Issuer Bid (In shares) | shares | (4,000,000) | (40,050,000) |  |
Purchase of common shares under Normal Course Issuer Bid | $ (342) | $ (3,318) |  |
Balance – end of year |  | 39,832 | $ 38,175 | $ 36,945
Share capital |  |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |  |
Balance – beginning of year | $ 10,712 | 10,294 | 10,168 | 9,606
Issued upon exercise of stock options |  | 372 | 442 | 707
Previously recognized liability on stock options exercised ‍for common shares |  | 435 | 387 | 139
Balance – end of year |  | $ 10,712 | $ 10,294 | 10,168
Ordinary shares | Share capital |  |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |  |
Balance - beginning of year (in shares) | shares | 1,072,408,000 | 1,102,636,000 | 1,168,369,000 |
Balance – beginning of year | $ 10,712 | $ 10,294 | $ 10,168 |
Issued upon exercise of stock options (in shares) | shares |  | 9,822,000 | 11,605,000 |
Issued upon exercise of stock options |  | $ 372 | $ 442 |
Previously recognized liability on stock options exercised ‍for common shares |  | $ 435 | $ 387 |
Purchase of common shares under Normal Course Issuer Bid (In shares) | shares |  | (40,050,000) | (77,338,000) |
Purchase of common shares under Normal Course Issuer Bid |  | $ (389) | $ (703) | $ (284)
Balance - end of year (in shares) | shares |  | 1,072,408,000 | 1,102,636,000 | 1,168,369,000
Balance – end of year |  | $ 10,712 | $ 10,294 | $ 10,168

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