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Interest-Bearing Loans and Borrowings - Summary of Total Principal Amount Repurchased in the Tender Offer (Detail)
£ in Millions, $ in Millions
Dec. 05, 2023
GBP (£)
Dec. 05, 2023
USD ($)
2.850% Notes due 2037 [Member]    
Disclosure of detailed information about borrowings [line items]    
Date of redemption Dec. 05, 2023  
Issuer ABISA  
Title of series of notes partially repurchased 2.85% 2.85%
Notes Repurchased Maturity Period Notes due 2037  
Currency GBP  
Original principal amount outstanding | £ £ 411  
Principal amount repurchased | £ 163  
Principal amount not repurchased | £ £ 248  
3.750% Notes due 2042 [Member]    
Disclosure of detailed information about borrowings [line items]    
Date of redemption Dec. 05, 2023  
Issuer ABIWW  
Title of series of notes partially repurchased 3.75% 3.75%
Notes Repurchased Maturity Period Notes due 2042  
Currency USD  
Original principal amount outstanding   $ 471
Principal amount repurchased   121
Principal amount not repurchased   $ 350
4.600% Notes due 2060 [Member]    
Disclosure of detailed information about borrowings [line items]    
Date of redemption Dec. 05, 2023  
Issuer ABIWW  
Title of series of notes partially repurchased 4.60% 4.60%
Notes Repurchased Maturity Period Notes due 2060  
Currency USD  
Original principal amount outstanding   $ 497
Principal amount repurchased   150
Principal amount not repurchased   $ 347
4.500% Notes due 2050 [Member]    
Disclosure of detailed information about borrowings [line items]    
Date of redemption Dec. 05, 2023  
Issuer ABIWW  
Title of series of notes partially repurchased 4.50% 4.50%
Notes Repurchased Maturity Period Notes due 2050  
Currency USD  
Original principal amount outstanding   $ 1,567
Principal amount repurchased   465
Principal amount not repurchased   $ 1,102
4.600% Notes due 2048 [Member]    
Disclosure of detailed information about borrowings [line items]    
Date of redemption Dec. 05, 2023  
Issuer ABIWW  
Title of series of notes partially repurchased 4.60% 4.60%
Notes Repurchased Maturity Period Notes due 2048  
Currency USD  
Original principal amount outstanding   $ 2,179
Principal amount repurchased   1,124
Principal amount not repurchased   $ 1,055
3.650% Notes due 2026 [Member]    
Disclosure of detailed information about borrowings [line items]    
Date of redemption Dec. 05, 2023  
Issuer ABIWW and ABC  
Title of series of notes partially repurchased 3.65% 3.65%
Notes Repurchased Maturity Period Notes due 2026  
Currency USD  
Original principal amount outstanding   $ 3,491
Principal amount repurchased   1,237
Principal amount not repurchased   $ 2,254
4.000% Notes due 2043 [Member]    
Disclosure of detailed information about borrowings [line items]    
Date of redemption Dec. 05, 2023  
Issuer ABIFI  
Title of series of notes partially repurchased 4.00% 4.00%
Notes Repurchased Maturity Period Notes due 2043  
Currency USD  
Original principal amount outstanding   $ 404
Principal amount repurchased   64
Principal amount not repurchased   $ 340