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Capital Disclosures -Summary of Reconciliation of Net Debt Plus Shareholders' Equity (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Disclosure of Reconciliation of Net debt to EBITDA ratio [Line Items]        
Long-term debt $ 708 $ 919 $ 1,027  
Cash and cash equivalents (92) (95) (187) [1] $ (187)
Net debt 616 824 840  
Total shareholders' equity 1,049 1,054 1,140 $ 1,140
Total capital $ 1,665 $ 1,878 $ 1,980  
[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.