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Dispositions (Narrative) (Details) $ in Millions, $ in Millions |  | 3 Months Ended | 5 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 04, 2024 CAD ($) | Dec. 31, 2024 CAD ($) | Sep. 30, 2024 CAD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 CAD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CAD ($) | Aug. 05, 2024 CAD ($) | Dec. 31, 2022 CAD ($)
Details of the assets and liabilities classified as held for sale [Line items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 5,858 |  |  |  | $ 5,858 |  | $ 5,858 |  | $ 5,871 |  | $ 6,012
Goodwill impairment charge |  |  |  |  |  |  |  | 214 |  | $ 0 |  |
NMGC |  |  |  |  |  |  |  |  |  |  |  |
Details of the assets and liabilities classified as held for sale [Line items] |  |  |  |  |  |  |  |  |  |  |  |
Disposition, Value |  |  |  |  |  |  |  |  |  |  | $ 1,300 |
Goodwill |  |  |  |  |  |  |  |  |  |  | $ 366 |
Goodwill impairment charge |  |  | $ 210 | $ 155 |  |  |  | 210 | $ 155 |  |  |
Goodwill impairment charge, net of tax |  |  | 198 | $ 146 |  |  |  | 198 | $ 146 |  |  |
Estimated future transaction costs |  |  | 16 |  |  |  |  |  |  |  |  |
Estimated future transaction costs, net of tax |  |  | 12 |  |  |  |  |  |  |  |  |
Incurred transaction costs |  |  | 9 |  |  |  |  |  |  |  |  |
Incurred transaction costs, net of tax |  |  | $ 7 |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  | 26 | $ 19 |  |  |  |  |
LIL |  |  |  |  |  |  |  |  |  |  |  |
Details of the assets and liabilities classified as held for sale [Line items] |  |  |  |  |  |  |  |  |  |  |  |
Disposition, Value | $ 1,200 |  |  |  |  |  |  |  |  |  |  |
Proceeds on disposition of business | $ 957 |  |  |  |  |  |  |  |  |  |  |
Percent of equity interest sold | 31.10% |  |  |  |  |  |  |  |  |  |  |
Amount of contractual obligation to fund the remaining initial capital investment | $ 235 |  |  |  |  |  |  |  |  |  |  |
Cash proceeds held in escrow | $ 30 |  |  |  |  |  |  |  |  |  |  |
Escrow proceeds receivable |  | 25 |  |  |  | $ 25 |  | $ 25 |  |  |  |
Disposition, gain on disposition |  |  |  |  | $ 182 |  |  |  |  |  |  |
Disposition, gain on disposition, net of tax |  |  |  |  | $ 107 |  |  |  |  |  |  |
Tax benefit due to reversal of a prior year valuation allowance related to loss carryforwards |  | $ 22 |  |  |  |  |  |  |  |  |  |

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