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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.