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Tax - Summary of Unrecognised Deferred Tax Position (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Unrecognised deferred tax position [line items]    
Unrecognised deferred tax $ 307 $ 274
Gross carrying amount 1,188 1,080
Revenue losses    
Unrecognised deferred tax position [line items]    
Gross carrying amount 480 432
Unrecognised deferred tax 84 75
Capital losses    
Unrecognised deferred tax position [line items]    
Gross carrying amount 630 580
Unrecognised deferred tax 158 146
Total losses    
Unrecognised deferred tax position [line items]    
Gross carrying amount 1,110 1,012
Unrecognised deferred tax 242 221
Tax credits    
Unrecognised deferred tax position [line items]    
Unused tax credits for which no deferred tax asset recognised 61 46
Unrecognised tax credits deferred tax 61 46
Other    
Unrecognised deferred tax position [line items]    
Unrecognised deferred tax 4 7
Deductible temporary differences for which no deferred tax asset is recognised $ 17 $ 22