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Events after the balance sheet date (Tables)
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Summary of exercising option to redeem outstanding principal amount
 
Date of redemption
   
Issuer
(abbreviated)
   
Title of series of notes issued
redeemed
     
Currency
     
Original principal
amount outstanding

(in million)
     
Principal amount
redeemed

(in million)
  
9 February 2022
    ABIFI      3.650% Notes due 2026        USD        1 633        1 633  
1 March 2022
    ABIFI      4.915% Notes due 2046        USD        1 470        1 470