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Tax - Summary of Unrecognized Deferred Tax Based on Expiry Date (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
2024 [member]    
Unrecognised deferred tax position [line items]    
Gross carrying amount $ 0 $ 6
Unrecognised deferred tax 0 1
2025 [member]    
Unrecognised deferred tax position [line items]    
Gross carrying amount 11 11
Unrecognised deferred tax 2 2
2026 [member]    
Unrecognised deferred tax position [line items]    
Gross carrying amount 7 7
Unrecognised deferred tax 1 1
2027 [Member]    
Unrecognised deferred tax position [line items]    
Gross carrying amount 7 7
Unrecognised deferred tax 1 1
2028 [member]    
Unrecognised deferred tax position [line items]    
Gross carrying amount 0 6
Unrecognised deferred tax 0 1
2029 [member]    
Unrecognised deferred tax position [line items]    
Gross carrying amount 10 10
Unrecognised deferred tax 10 10
After 2031 [Member]    
Unrecognised deferred tax position [line items]    
Gross carrying amount 36 22
Unrecognised deferred tax $ 36 $ 22