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Share Capital and Warrants - Additional Information (Detail) - CAD ($) $ / shares in Units, shares in Thousands, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 27, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Maximum percentage of preferred stock upon issuance or outstanding of common stock |  |  |  | 20.00% |  |  |
Payments to acquire or redeem entity's shares |  | $ 1,018 | $ 0 | $ 1,484 | $ 0 |  |
Common shares |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Purchase of Common Shares Under NCIB (in shares) |  |  |  | 67,779 |  | 17,026 |
Share repurchase program (in CAD per share) |  |  |  | $ 21.89 |  |  |
Payments to acquire or redeem entity's shares |  |  |  | $ 1,500 |  |  |
Share repurchase program, reduction to contributed surplus |  |  |  | $ 907 |  |  |
Shares outstanding (in shares) |  | 1,949,609 |  | 1,949,609 |  | 2,001,211 | 1,228,870
Issued capital |  | $ 16,653 |  | $ 16,653 |  | $ 17,016 | $ 11,040
Common shares | Potential ordinary share transactions |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Purchase of Common Shares Under NCIB (in shares) | 19,000 |  |  |  |  |  |
Payments to acquire or redeem entity's shares | $ 425 |  |  |  |  |  |
Stock Option Plan |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Shares available for future issuance (in shares) |  | 41,000 |  | 41,000 |  | 30,000 |
Preference shares |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Shares outstanding (in shares) |  | 36,000 |  | 36,000 |  | 36,000 |
Issued capital |  | $ 519 |  | $ 519 |  | $ 519 |

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