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Equity - Share capital and premium additional information (Details)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2024
€ / shares
Disclosure of classes of share capital [line items]        
Condition of conversion (percent) 0.0700      
Issue of contingent convertible capital securities | $ $ 982 $ 864 $ 750  
Authorised share capital, ordinary shares (in shares) 9,142,000 9,142,000 9,142,000  
Issued share capital, ordinary shares (in shares) 3,147,391 3,498,194 3,726,539  
Treasury shares        
Disclosure of classes of share capital [line items]        
Issued share capital, ordinary shares (in shares) 51,100 154,600 107,400  
Perpetual additional tier 1 contingent capital securities        
Disclosure of classes of share capital [line items]        
Issued capital | $ $ 8,750 $ 7,750 $ 6,750  
Ordinary shares        
Disclosure of classes of share capital [line items]        
Par value (in EUR per share) | € / shares       € 0.01