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Changes in Accounting Policies - Summary of Change in Presentation Currency Resulted in Impact on the Year Ended, Opening Consolidated Statement of Financial Position (Details) $ in Millions, $ in Millions | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CAD ($) | Jan. 01, 2023 USD ($) | Jan. 01, 2023 CAD ($)
--- | --- | --- | --- | --- | ---
Statement Of Financial Position Line Items |  |  |  |  |  |
Total assets | $ 2,791 | $ 2,958 |  | $ 3,144 | [1] |
Total liabilities | 1,742 | 1,904 |  | 2,004 | [1] |
Total shareholders' equity | $ 1,049 | 1,054 |  | 1,140 | [1] |
Previously Reported [Member] |  |  |  |  |  |
Statement Of Financial Position Line Items |  |  |  |  |  |
Total assets |  |  | $ 3,912 |  |  | $ 4,258
Total liabilities |  |  | 2,518 |  |  | 2,715
Total shareholders' equity |  |  | $ 1,394 |  |  | $ 1,543
Presentation Currency Change [Member] |  |  |  |  |  |
Statement Of Financial Position Line Items |  |  |  |  |  |
Total assets |  | (954) |  | (1,114) |  |
Total liabilities |  | (614) |  | (711) |  |
Total shareholders' equity |  | $ (340) |  | $ (403) |  |
[1] | Effective January 1, 2024, the Company changed its presentation currency from Canadian dollars to United States dollars. Refer to Note 4 “Changes in Accounting Policies” for further details.

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