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Share Capital and Warrants - Narrative (Details) - CAD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
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Jun. 14, 2023 | Feb. 12, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Nov. 07, 2023 | Dec. 31, 2021
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of preferred stock upon issuance or outstanding of common stock |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |
NCIB, shares redeemed, amount |  |  |  |  |  |  |  |  |  |  | $ 1,061.0 | $ 2,530.0 |  |
NCIB, reduction to contributed surplus |  |  |  |  |  |  |  |  |  |  | $ 688.0 | $ 1,571.0 |  |
Preference shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  | 0 |  |  |  |  |  |  |  | 0 |  |  |
Shares outstanding (in shares) |  |  | 36,000,000 |  |  |  | 36,000,000 |  |  |  | 36,000,000 | 36,000,000 |  |
Issued capital |  |  | $ 519.0 |  |  |  | $ 519.0 |  |  |  | $ 519.0 | $ 519.0 |  |
Dividend Rate (percent) |  |  | 6.89% | 6.29% | 6.29% | 5.86% | 5.05% | 3.21% | 2.35% | 1.86% |  |  |  |
Preference shares | Series 1 First Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding (in shares) |  |  | 10,740,000 |  |  |  |  |  |  |  | 10,740,000 |  |  |
Dividend Rate (percent) |  |  |  |  |  |  |  |  |  |  | 2.58% |  |  |
Preference shares | Series 1 First Preferred Shares | Government of Canada Bond |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, basis spread |  |  | 173.00% |  |  |  |  |  |  |  | 173.00% |  |  |
Preference shares | Series 2 First Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding (in shares) |  |  | 1,260,000 |  |  |  |  |  |  |  | 1,260,000 |  |  |
Dividend Rate (percent) |  |  |  |  |  |  |  |  |  |  | 6.77% |  |  |
Preference shares | Series 2 First Preferred Shares | 90-Day Government of Canada Treasury Bills |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, basis spread |  |  | 173.00% |  |  |  |  |  |  |  | 173.00% |  |  |
Preference shares | Series 3 First Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding (in shares) |  |  | 10,000,000 |  |  |  |  |  |  |  | 10,000,000 |  |  |
Dividend Rate (percent) |  |  |  |  |  |  |  |  |  |  | 4.69% |  |  |
Preference shares | Series 3 First Preferred Shares | Government of Canada Bond |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, basis spread |  |  | 313.00% |  |  |  |  |  |  |  | 313.00% |  |  |
Preference shares | Series 5 First Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding (in shares) |  |  | 8,000,000 |  |  |  |  |  |  |  | 8,000,000 |  |  |
Dividend Rate (percent) |  |  |  |  |  |  |  |  |  |  | 4.59% |  |  |
Preference shares | Series 5 First Preferred Shares | Government of Canada Bond |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, basis spread |  |  | 357.00% |  |  |  |  |  |  |  | 357.00% |  |  |
Preference shares | Series 7 First Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding (in shares) |  |  | 6,000,000 |  |  |  |  |  |  |  | 6,000,000 |  |  |
Dividend Rate (percent) |  |  |  |  |  |  |  |  |  |  | 3.94% |  |  |
Preference shares | Series 7 First Preferred Shares | Government of Canada Bond |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, basis spread |  |  | 352.00% |  |  |  |  |  |  |  | 352.00% |  |  |
Preference shares | First Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable preferred shares, conversion term |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Redeemable preferred shares, price per share |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  |
Preference shares | Series 1 And 2 First Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable preferred shares, conversion term |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Preference shares | Series 3 and 4 First Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable preferred shares, conversion term |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Preference shares | Series 5 and 6 First Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable preferred shares, conversion term |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Preference shares | Series 7 and 8 First Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable preferred shares, conversion term |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Preference shares | Series 1, 3, 5, 7 First Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable preferred shares, conversion term |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Preference shares | Series 4 First Preferred Shares | 90-Day Government of Canada Treasury Bills |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, basis spread |  |  | 313.00% |  |  |  |  |  |  |  | 313.00% |  |  |
Preference shares | Series 6 First Preferred Shares | 90-Day Government of Canada Treasury Bills |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, basis spread |  |  | 357.00% |  |  |  |  |  |  |  | 357.00% |  |  |
Preference shares | Series 8 First Preferred Shares | 90-Day Government of Canada Treasury Bills |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, basis spread |  |  | 352.00% |  |  |  |  |  |  |  | 352.00% |  |  |
Preference shares | Series 2,4,6,8 First Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable preferred shares, price per share |  |  |  |  |  |  |  |  |  |  | $ 25.50 |  |  |
Second Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding (in shares) |  |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of Common Shares under NCIB |  |  |  |  |  |  |  |  |  |  | 43,611,000 | 112,489,000 |  |
Shares outstanding (in shares) |  |  | 1,871,868,000 |  |  |  | 1,909,190,000 |  |  |  | 1,871,868,000 | 1,909,190,000 |  | 2,001,211,000
Issued capital |  |  | $ 16,031.0 |  |  |  | $ 16,320.0 |  |  |  | $ 16,031.0 | $ 16,320.0 |  | $ 17,016.0
Common Shares | Original NCIB |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
NCIB, shares repurchased, price per share (in CAD per share) |  |  |  |  |  |  |  |  |  |  | $ 24.32 | $ 22.49 |  |
NCIB, shares redeemed, amount |  |  |  |  |  |  |  |  |  |  | $ 1,100.0 | $ 2,500.0 |  |
NCIB, reduction to contributed surplus |  |  |  |  |  |  |  |  |  |  | $ 688.0 | $ 1,600.0 |  |
Common Shares | Renewed NCIB |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
NCIB, shares authorized for repurchase (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 133,200,000 |
Common Shares | Renewed NCIB | Potential ordinary share transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
NCIB, shares authorized for repurchase (in shares) |  | 118,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase of Common Shares under NCIB |  | 4,300,000 |  |  |  |  |  |  |  |  |  |  |  |
NCIB, shares redeemed, amount |  | $ 92.0 |  |  |  |  |  |  |  |  |  |  |  |
Common Share Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding (in shares) |  |  | 7,625,000 |  |  |  | 55,720,000 |  |  |  | 7,625,000 | 55,720,000 |  | 65,119,000
Issued capital |  |  | $ 25.0 |  |  |  | $ 184.0 |  |  |  | $ 25.0 | $ 184.0 |  | $ 215.0
Exercise price of warrants issued (in CAD per share) | $ 6.54 |  |  |  |  |  |  |  |  |  | $ 6.54 |  |  |
Purchases and cancelled (in shares) | 45,500,000 |  |  |  |  |  |  |  |  |  | 45,485,000 | 0 |  |
Purchase Price, Warrants, Per Share | $ 22.18 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased and Cancelled | $ 711.0 |  |  |  |  |  |  |  |  |  | $ 151.0 | $ 0.0 |  |
Decrease Through Repurchase And Cancellation of Warrants, Equity | 560.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease Through Repurchase And Cancellation of Warrants, Transaction Costs, Equity | $ 2.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Option Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for future issuance (in shares) |  |  | 45,500,000 |  |  |  | 43,100,000 |  |  |  | 45,500,000 | 43,100,000 |  |

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