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Derivatives Instruments (Realized and Unrealized Gains (Losses) on Other Derivatives) (Details) shares in Millions, $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2024 USD ($) shares
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Equity derivative hedges, return of shares | shares |  |  | 2.9
FX forwards |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Realized gains (loss) | $ (56) | $ 17 |
Combined notional amount |  |  | $ 520
FX forwards | OM&G |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized gain (loss) | 0 | 0 |
Realized gains (loss) | 0 | 0 |
FX forwards | Other income, net |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized gain (loss) | (44) | 28 |
Realized gains (loss) | (12) | (11) |
Equity derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Realized gains (loss) | 14 | (9) |
Equity derivatives | OM&G |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized gain (loss) | (2) | 4 |
Realized gains (loss) | 16 | (13) |
Equity derivatives | Other income, net |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized gain (loss) | 0 | 0 |
Realized gains (loss) | $ 0 | $ 0 |

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E + Details
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