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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 (€)
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