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Share Capital (Tables) | 12 Months Ended
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Dec. 31, 2025
Class of Stock Disclosures [Abstract] |
Schedule of Common Stock Issued and Outstanding |
As at December 31 |  | 2025 |  |  | 2024 |  |  | 2023 |
|  | Number (millions) |  |  | Amount |  |  | Number (millions) |  |  | Amount |  |  | Number (millions) |  |  | Amount |
Shares of Common Stock Outstanding, Beginning of Year |  |  | 260.4 |  |  | $ | 3 |  |  |  | 271.7 |  |  | $ | 3 |  |  |  | 245.7 |  |  | $ | 3 |
Shares of Common Stock Purchased |  |  | (7.8 | ) |  |  | - |  |  |  | (12.7 | ) |  |  | - |  |  |  | (9.9 | ) |  |  | - |
Shares of Common Stock Issued |  |  | 0.7 |  |  |  | - |  |  |  | 1.4 |  |  |  | - |  |  |  | 35.9 |  |  |  | - |
Shares of Common Stock Outstanding, End of Year |  |  | 253.3 |  |  | $ | 3 |  |  |  | 260.4 |  |  | $ | 3 |  |  |  | 271.7 |  |  | $ | 3 |
Earnings Per Common Share |
For the years ended December 31 (US$ millions, except per share amounts) |  | 2025 |  |  | 2024 |  |  | 2023 |
Net Earnings (Loss) |  | $ | 1,242 |  |  | $ | 1,125 |  |  | $ | 2,085 |
Number of Shares of Common Stock: |  |  |  |  |  |  |  |  |
Weighted average shares of common stock outstanding - Basic |  |  | 257.2 |  |  |  | 264.6 |  |  |  | 259.9 |
Effect of dilutive securities |  |  | 2.5 |  |  |  | 2.8 |  |  |  | 4.0 |
Weighted Average Shares of Common Stock Outstanding - Diluted |  |  | 259.7 |  |  |  | 267.4 |  |  |  | 263.9 |
Net Earnings (Loss) per Share of Common Stock |  |  |  |  |  |  |  |  |
Basic |  | $ | 4.83 |  |  | $ | 4.25 |  |  | $ | 8.02 |
Diluted |  |  | 4.78 |  |  |  | 4.21 |  |  |  | 7.90 |

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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