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Events after the balance sheet date - Summary of exercising option to redeem outstanding principal amount (Detail) - Jul. 13, 2020 - Event After Reporting Date [member] $ in Millions, $ in Millions, $ in Millions | USD ($) | AUD ($) | CAD ($)
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2.500% Notes due 2022 [member] |  |  |
Disclosure Of Exercising Option To Redeem Outstanding Principal Amount [Line Items] |  |  |
Date of redemption | Aug. 12, 2020 |  |
Issuer | ABIWW |  |
Title of series of notes issued exchanged | 2.500% Notes due 2022 |  |
Currency | USD |  |
Original principal amount outstanding | $ 454 |  |
Principal amount not redeemed | $ 454 |  |
4.375% Notes due 2021 [member] |  |  |
Disclosure Of Exercising Option To Redeem Outstanding Principal Amount [Line Items] |  |  |
Date of redemption | Aug. 12, 2020 |  |
Issuer | ABIWW |  |
Title of series of notes issued exchanged | 4.375% Notes due 2021 |  |
Currency | USD |  |
Original principal amount outstanding | $ 285 |  |
Principal amount not redeemed | $ 285 |  |
3.250% Notes due 2022 [member] |  |  |
Disclosure Of Exercising Option To Redeem Outstanding Principal Amount [Line Items] |  |  |
Date of redemption | Jul. 29, 2020 |  |
Issuer | ABIWW |  |
Title of series of notes issued exchanged | 3.250% Notes due 2022 |  |
Currency | AUD |  |
Original principal amount outstanding |  | $ 550 |
Principal amount not redeemed |  | $ 550 |
3.375% Notes due 2023 [member] |  |  |
Disclosure Of Exercising Option To Redeem Outstanding Principal Amount [Line Items] |  |  |
Date of redemption | Aug. 12, 2020 |  |
Issuer | ABIFI |  |
Title of series of notes issued exchanged | 3.375% Notes due 2023 |  |
Currency | CAD |  |
Original principal amount outstanding |  |  | $ 600
Principal amount not redeemed |  |  | $ 600
3.750% Notes due 2022 [member] |  |  |
Disclosure Of Exercising Option To Redeem Outstanding Principal Amount [Line Items] |  |  |
Date of redemption | Aug. 12, 2020 |  |
Issuer | ABNA |  |
Title of series of notes issued exchanged | 3.750% Notes due 2022 |  |
Currency | USD |  |
Original principal amount outstanding | $ 150 |  |
Principal amount not redeemed | $ 150 |  |

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