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Share-Based Payments - LTI Stock Option Plan Executives - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Issued ordinary and restricted shares at 1 January, net of treasury shares | shares 1,984,000,000 1,984,000,000 1,981,000,000
Long Term Restricted Stock Unit Program Three [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share based payment vesting period 5 years    
Restricted Stock Units [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Issued ordinary and restricted shares at 1 January, net of treasury shares | shares 1,600,000 1,700,000  
Share-based compensation grant date fair value | $ $ 94 $ 102  
Annual LTI Plans [member] | Long Term Incentive Restricted Stock Unit [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Description of share to acquire by holder one    
Annual LTI Plans [member] | Long Term Incentive Restricted Stock Unit [member] | Executive [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share-based compensation number of shares issued 4,400,000   2,900,000
Share-based compensation grant date fair value | $ $ 239 $ 183  
Annual LTI Plans [member] | Long Term Incentive Restricted Stock Unit [member] | Board of Director [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Issued ordinary and restricted shares at 1 January, net of treasury shares | shares 500,000 100,000  
Annual LTI Plans [member] | Long Term Incentive Performance Share Units [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share-based compensation grant date fair value | $ $ 45 $ 39  
Annual LTI Plans [member] | Long Term Incentive Performance Share Units [member] | Executive [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share-based compensation number of shares issued 800,000 500,000  
Annual LTI Plans [member] | Performance share units (PSUs) [member] | Board of Director [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share-based compensation number of shares issued 134,000 33,000  
Other Recurring LTI RSU Plans [member] | Long Term Restricted Stock Unit Program One [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Fair value of options granted | $ $ 12 $ 35  
Share-based compensation number of shares issued 200,000 600,000  
Other Recurring LTI RSU Plans [member] | Long Term Restricted Stock Unit Program Three [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share-based compensation number of shares issued 0 0  
Other Recurring LTI RSU Plans [member] | Restricted Stock Units [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share-based compensation number of shares issued | shares 0 0