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Equity - Summary of Equity Share Capital (Detail)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2025
£ / shares
Dec. 31, 2024
£ / shares
Dec. 31, 2023
£ / shares
Dec. 31, 2022
£ / shares
Disclosure of classes of share capital [line items]              
Number of shares beginning balance (in shares) | shares 165 172 183        
Beginning balance $ (2,308) $ (1,946) $ (1,608)        
Repurchased and cancelled under share repurchase programme (in shares) | shares (8) (7) (11)        
Exchange and other adjustments $ 3 $ 0 $ 0        
Number of shares ending balance (in shares) | shares 157 165 172        
Ending balance $ (2,736) $ (2,308) $ (1,946)        
Par value per share (in dollars per share) | £ / shares       £ 0.2085 £ 0.2085 £ 0.2085 £ 0.2085
Nominal value              
Disclosure of classes of share capital [line items]              
Beginning balance 43 46 46        
Repurchased and cancelled under share repurchase programme (2) (2) (3)        
Exchange and other adjustments 3 (1) 3        
Ending balance 44 43 46        
Share premium              
Disclosure of classes of share capital [line items]              
Beginning balance 94 95 91        
Exchange and other adjustments 7 (1) 4        
Ending balance 101 94 95        
Equity share capital              
Disclosure of classes of share capital [line items]              
Beginning balance 137 141 137        
Repurchased and cancelled under share repurchase programme (2) (2) (3)        
Exchange and other adjustments 10 (2) 7        
Ending balance $ 145 $ 137 $ 141