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Debt - Long-term debt (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt [Line Items]      
Long-term debt including current portion of long-term debt € 6,857 € 5,355  
Non-current portion of non-current borrowings [1] € 5,705 € 4,939 € 3,427
Borrowings, maturity 6.3    
Borrowings, interest rate   14.20%  
Current portion of non-current borrowings € 1,153 € 416  
Bonds [Member] | US Dollar [Member]      
Debt [Line Items]      
Long-term debt including current portion of long-term debt 1,210 1,328  
Non-current portion of non-current borrowings 1,210    
Bonds [Member] | Euro [Member]      
Debt [Line Items]      
Long-term debt including current portion of long-term debt 3,229 2,234  
Forward contract [member]      
Debt [Line Items]      
Long-term debt including current portion of long-term debt 982 188  
Non-current portion of non-current borrowings 113 62  
Current portion of non-current borrowings 869 126  
Lease liabilities [member]      
Debt [Line Items]      
Long-term debt including current portion of long-term debt 1,216 1,381  
Current portion of non-current borrowings 267 272  
Bank borrowings [Member]      
Debt [Line Items]      
Long-term debt including current portion of long-term debt 205 206  
Non-current portion of non-current borrowings 203 205  
Current portion of non-current borrowings 1 1  
Other long-term debt [Member]      
Debt [Line Items]      
Long-term debt including current portion of long-term debt 16 17  
Non-current portion of non-current borrowings 1    
Current portion of non-current borrowings 15 17  
Later than one year and not later than five years [member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 2,329 1,681  
Later than one year and not later than five years [member] | Bonds [Member] | US Dollar [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 122    
Later than one year and not later than five years [member] | Bonds [Member] | Euro [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 1,494 995  
Later than one year and not later than five years [member] | Forward contract [member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 113 62  
Later than one year and not later than five years [member] | Lease liabilities [member]      
Debt [Line Items]      
Long-term debt including current portion of long-term debt 596 618  
Non-current portion of non-current borrowings 596 618  
Later than one year and not later than five years [member] | Bank borrowings [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 3 5  
Later than one year and not later than five years [member] | Other long-term debt [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 1    
Later than five years [member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 3,376 3,258  
Later than five years [member] | Bonds [Member] | US Dollar [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 1,088 1,328  
Later than five years [member] | Bonds [Member] | Euro [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 1,735 1,239  
Later than five years [member] | Lease liabilities [member]      
Debt [Line Items]      
Long-term debt including current portion of long-term debt 352 491  
Non-current portion of non-current borrowings 352 491  
Later than five years [member] | Bank borrowings [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 200 200  
Later than five years [member] | Other long-term debt [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 0    
Later than one year [member] | Bonds [Member] | US Dollar [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings   1,328  
Later than one year [member] | Bonds [Member] | Euro [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 3,229 2,234  
Later than one year [member] | Lease liabilities [member]      
Debt [Line Items]      
Non-current portion of non-current borrowings € 948 € 1,109  
Weighted average [member]      
Debt [Line Items]      
Borrowings, maturity 6.3 8.0  
Borrowings, interest rate 2.00% 2.50%  
Weighted average [member] | Bonds [Member] | US Dollar [Member]      
Debt [Line Items]      
Borrowings, maturity 16.1 17.1  
Borrowings, interest rate 6.30% 6.30%  
Weighted average [member] | Bonds [Member] | Euro [Member]      
Debt [Line Items]      
Borrowings, maturity 5.4 5.8  
Borrowings, interest rate 1.00% 0.80%  
Weighted average [member] | Forward contract [member]      
Debt [Line Items]      
Borrowings, maturity 0.9 1.2  
Weighted average [member] | Lease liabilities [member]      
Debt [Line Items]      
Borrowings, maturity 3.9 4.3  
Borrowings, interest rate 2.10% 2.40%  
Weighted average [member] | Bank borrowings [Member]      
Debt [Line Items]      
Borrowings, maturity 4.1 5.1  
Borrowings, interest rate 0.20% 0.30%  
Weighted average [member] | Other long-term debt [Member]      
Debt [Line Items]      
Borrowings, maturity 1.0 1.0  
Borrowings, interest rate 0.00% 1.80%  
[1] Non-IFRS financial measure. For the definition and reconciliation of the most directly comparable IFRS measure, refer to Reconciliation of non-IFRS information.