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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 ($)
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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

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