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Preference Shares - Issued and Outstanding (Details) - CAD ($) shares in Thousands, $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Class of Stock [Line Items] |  |
Preferred stock issued (shares) | 66,200 | 66,200
Preferred stock outstanding (shares) | 66,200 | 66,200
Preferred stock issued | $ 1,623 | $ 1,623
Preferred stock outstanding | $ 1,623 | $ 1,623
Series F |  |
Class of Stock [Line Items] |  |
Preferred stock issued (shares) | 5,000 | 5,000
Preferred stock outstanding (shares) | 5,000 | 5,000
Preferred stock issued | $ 122 | $ 122
Preferred stock outstanding | $ 122 | $ 122
Series G |  |
Class of Stock [Line Items] |  |
Preferred stock issued (shares) | 9,200 | 9,200
Preferred stock outstanding (shares) | 9,200 | 9,200
Preferred stock issued | $ 225 | $ 225
Preferred stock outstanding | $ 225 | $ 225
Series H |  |
Class of Stock [Line Items] |  |
Preferred stock issued (shares) | 7,665 | 7,665
Preferred stock outstanding (shares) | 7,665 | 7,665
Preferred stock issued | $ 188 | $ 188
Preferred stock outstanding | $ 188 | $ 188
Series I |  |
Class of Stock [Line Items] |  |
Preferred stock issued (shares) | 2,335 | 2,335
Preferred stock outstanding (shares) | 2,335 | 2,335
Preferred stock issued | $ 57 | $ 57
Preferred stock outstanding | $ 57 | $ 57
Series J |  |
Class of Stock [Line Items] |  |
Preferred stock issued (shares) | 8,000 | 8,000
Preferred stock outstanding (shares) | 8,000 | 8,000
Preferred stock issued | $ 196 | $ 196
Preferred stock outstanding | $ 196 | $ 196
Series K |  |
Class of Stock [Line Items] |  |
Preferred stock issued (shares) | 10,000 | 10,000
Preferred stock outstanding (shares) | 10,000 | 10,000
Preferred stock issued | $ 244 | $ 244
Preferred stock outstanding | $ 244 | $ 244
Series M |  |
Class of Stock [Line Items] |  |
Preferred stock issued (shares) | 24,000 | 24,000
Preferred stock outstanding (shares) | 24,000 | 24,000
Preferred stock issued | $ 591 | $ 591
Preferred stock outstanding | $ 591 | $ 591

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