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Events after the balance sheet date - Summary of principal amount accepted in the tender offers (Detail) - Jul. 07, 2020 - Event After Reporting Date [member] € in Millions, $ in Millions | USD ($) | EUR (€)
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4.000% Notes due 2021 [member] |  |
Disclosure Of Principal Amount Accepted In The Tender Offer [Line Items] |  |
Date of redemption | Jul. 07, 2020 |
Issuer | ABISA |
Title of series of notes issued exchanged | 4.000% Notes due 2021 |
Currency | EUR |
Original principal amount outstanding |  | € 750
Principal amount redeemed |  | 231
Principal amount not redeemed |  | 519
1.950% Notes due 2021 [member] |  |
Disclosure Of Principal Amount Accepted In The Tender Offer [Line Items] |  |
Date of redemption | Jul. 07, 2020 |
Issuer | ABISA |
Title of series of notes issued exchanged | 1.950% Notes due 2021 |
Currency | EUR |
Original principal amount outstanding |  | 650
Principal amount redeemed |  | 123
Principal amount not redeemed |  | 527
0.875% Notes due 2022 [member] |  |
Disclosure Of Principal Amount Accepted In The Tender Offer [Line Items] |  |
Date of redemption | Jul. 07, 2020 |
Issuer | ABISA |
Title of series of notes issued exchanged | 0.875% Notes due 2022 |
Currency | EUR |
Original principal amount outstanding |  | 2,000
Principal amount redeemed |  | 356
Principal amount not redeemed |  | 1,644
0.800% Notes due 2023 [member] |  |
Disclosure Of Principal Amount Accepted In The Tender Offer [Line Items] |  |
Date of redemption | Jul. 07, 2020 |
Issuer | ABISA |
Title of series of notes issued exchanged | 0.800% Notes due 2023 |
Currency | EUR |
Original principal amount outstanding |  | 1,000
Principal amount redeemed |  | 356
Principal amount not redeemed |  | € 644
Floating Rate Notes due 2021 [member] |  |
Disclosure Of Principal Amount Accepted In The Tender Offer [Line Items] |  |
Date of redemption | Jul. 07, 2020 |
Issuer | ABIFI |
Title of series of notes issued exchanged | Floating Rate Notes due 2021 |
Currency | USD |
Original principal amount outstanding | $ | $ 311 |
Principal amount redeemed | $ | 129 |
Principal amount not redeemed | $ | $ 182 |
2.625% Notes due 2023 [member] |  |
Disclosure Of Principal Amount Accepted In The Tender Offer [Line Items] |  |
Date of redemption | Jul. 07, 2020 |
Issuer | ABIFI |
Title of series of notes issued exchanged | 2.625% Notes due 2023 |
Currency | USD |
Original principal amount outstanding | $ | $ 643 |
Principal amount redeemed | $ | 167 |
Principal amount not redeemed | $ | $ 476 |
3.300% Notes due 2023 [member] |  |
Disclosure Of Principal Amount Accepted In The Tender Offer [Line Items] |  |
Date of redemption | Jul. 07, 2020 |
Issuer | ABIFI |
Title of series of notes issued exchanged | 3.300% Notes due 2023 |
Currency | USD |
Original principal amount outstanding | $ | $ 2,799 |
Principal amount redeemed | $ | 1,467 |
Principal amount not redeemed | $ | $ 1,332 |

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