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Share-Based Compensation - Summary of Share-based Compensation Expenses (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation expense $ 29 $ 6
Deferred share units [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation expense 11 1
Performance share units [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation expense 7 0
Restricted share units [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation expense 10 5
Cash performance target [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation expense $ 1 $ 2