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Debt - Text Details (Detail)
€ in Millions, $ in Billions
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Nov. 12, 2020
EUR (€)
Dec. 31, 2019
EUR (€)
Sep. 30, 2019
EUR (€)
Dec. 31, 2018
EUR (€)
Jun. 28, 2017
EUR (€)
Debt [Line Items]              
Euro Medium-Term Note program € 10,000            
Change of Control Triggering Event, potentially required purchase price related to principal amount 101.00% 101.00%          
Borrowings, interest rate       14.20%      
Borrowings [1] € 6,934     € 5,447   € 4,821  
IFRS 16 [Member]              
Debt [Line Items]              
Borrowings           803  
Lease liabilities [member]              
Debt [Line Items]              
Lease liabilities       € 256      
Lease liabilities [member] | IFRS 16 [Member]              
Debt [Line Items]              
Lease liabilities           € 803  
Weighted average [member]              
Debt [Line Items]              
Borrowings, interest rate 2.00% 2.00%   2.50%      
Weighted average [member] | Lease liabilities [member]              
Debt [Line Items]              
Borrowings, interest rate 2.10% 2.10%   2.40%      
Commercial Paper Programme [Member]              
Debt [Line Items]              
Notional amount | $   $ 2.5          
Committed revolving credit facility [Member]              
Debt [Line Items]              
Undrawn borrowing facilities € 1,000            
Unsecured EUR Bonds Due 30/03/2025 1 3/8% [Member]              
Debt [Line Items]              
Notional amount € 500            
Borrowings, interest rate 1.375% 1.375%          
Unsecured EUR Bonds Due 30/03/2030 2% [Member]              
Debt [Line Items]              
Notional amount € 500            
Borrowings, interest rate 2.00% 2.00%          
Purchase forward contracts [Member]              
Debt [Line Items]              
Notional amount € 174   € 319        
Purchase forward contracts [Member] | Forward contract [member]              
Debt [Line Items]              
Notional amount 745     € 130      
Purchase forward contracts [Member] | Forward contract [member] | Share repurchase LTI 2020 [member]              
Debt [Line Items]              
Notional amount 174            
Share buyback program [Member]              
Debt [Line Items]              
Notional amount             € 1,500
Borrowings 1,500            
Matured [member]              
Debt [Line Items]              
Notional amount         € 500    
Matured [member] | Forward contract [member]              
Debt [Line Items]              
Notional amount € 126     576      
Unsecured EUR Bonds Due 22/05/2026 1/2 percent [Member]              
Debt [Line Items]              
Notional amount       € 750      
Borrowings, interest rate       0.50%      
Bank borrowings [Member] | Weighted average [member]              
Debt [Line Items]              
Borrowings, interest rate 5.90% 5.90%          
[1] Non-IFRS financial measure. For the definition and reconciliation of the most directly comparable IFRS measure, refer to Reconciliation of non-IFRS information.