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Events after the balance sheet date (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Feb. 19, 2025
Jun. 30, 2024
Feb. 07, 2025
Jan. 30, 2025
Dec. 31, 2024
Oct. 31, 2024
Jul. 31, 2024
Apr. 30, 2024
Feb. 29, 2024
Disclosure of non-adjusting events after reporting period [line items]                  
Dividends declared before financial statements authorized for issue $ 6,400                
Authorized amount for share buy-back program           $ 3,000 $ 3,000 $ 3,000 $ 2,000
$2,450m issued at 6.375%                  
Disclosure of non-adjusting events after reporting period [line items]                  
Notional amount         $ 2,450        
Other equity instruments interest rate         6.375%        
$2,450m issued at 6.375% | Contingent convertible securities                  
Disclosure of non-adjusting events after reporting period [line items]                  
Notional amount         $ 2,450        
Share buy-back programme                  
Disclosure of non-adjusting events after reporting period [line items]                  
Authorized amount for share buy-back program $ 2,000                
Securities called upon | $1,750m 2.999% fixed and floating rate securities | Senior unsecured securities                  
Disclosure of non-adjusting events after reporting period [line items]                  
Notional amount       $ 1,750          
Other equity instruments interest rate       2.999%          
Securities called upon | $500m floating rate securities | Senior unsecured securities                  
Disclosure of non-adjusting events after reporting period [line items]                  
Notional amount       $ 500          
Securities called upon | $2,450m issued at 6.375% | Contingent convertible securities                  
Disclosure of non-adjusting events after reporting period [line items]                  
Notional amount     $ 2,450            
Other equity instruments interest rate     6.375%            
Ordinary shares                  
Disclosure of non-adjusting events after reporting period [line items]                  
Dividends declared before financial statements authorised for issue, per share (in dollars per share)   $ 0.21              
Ordinary shares | Dividend distribution                  
Disclosure of non-adjusting events after reporting period [line items]                  
Dividends declared before financial statements authorised for issue, per share (in dollars per share) $ 0.36                
Dividends declared before financial statements authorized for issue $ 6,400