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Debt - Long-term debt (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt [Line Items]      
Long-term debt including current portion of long-term debt € 6,933 € 6,857  
Non-current portion of non-current borrowings [1] € 6,473 5,705 € 4,939
Borrowings, maturity 6.0    
Current portion of non-current borrowings € 459 1,153  
Forward contract [member]      
Debt [Line Items]      
Long-term debt including current portion of long-term debt 934 982  
Non-current portion of non-current borrowings 738 113  
Current portion of non-current borrowings 196 869  
Lease liabilities [member]      
Debt [Line Items]      
Long-term debt including current portion of long-term debt 1,220 1,216  
Current portion of non-current borrowings 257 267  
Bank borrowings [Member]      
Debt [Line Items]      
Long-term debt including current portion of long-term debt 203 205  
Non-current portion of non-current borrowings 202 203  
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 30 16  
Non-current portion of non-current borrowings 26    
Current portion of non-current borrowings 5 15  
US Dollar [Member] | Bonds [Member]      
Debt [Line Items]      
Long-term debt including current portion of long-term debt 1,313 1,210  
Non-current portion of non-current borrowings 1,313    
Euro [Member] | Bonds [Member]      
Debt [Line Items]      
Long-term debt including current portion of long-term debt € 3,233 € 3,229  
Weighted average [member]      
Debt [Line Items]      
Borrowings, maturity 6.0 6.3  
Borrowings, interest rate 2.10% 2.00%  
Weighted average [member] | Forward contract [member]      
Debt [Line Items]      
Borrowings, maturity 1.6 0.9  
Weighted average [member] | Lease liabilities [member]      
Debt [Line Items]      
Borrowings, maturity 4.2 3.9  
Borrowings, interest rate 2.10% 2.10%  
Weighted average [member] | Bank borrowings [Member]      
Debt [Line Items]      
Borrowings, maturity 3.2 4.1  
Borrowings, interest rate 0.10% 0.20%  
Weighted average [member] | Other long-term debt [Member]      
Debt [Line Items]      
Borrowings, maturity 8.6 1.0  
Borrowings, interest rate 3.50% 0.00%  
Weighted average [member] | US Dollar [Member] | Bonds [Member]      
Debt [Line Items]      
Borrowings, maturity 15.1 16.1  
Borrowings, interest rate 6.30% 6.30%  
Weighted average [member] | Euro [Member] | Bonds [Member]      
Debt [Line Items]      
Borrowings, maturity 4.4 5.4  
Borrowings, interest rate 1.00% 1.00%  
Later than one year and not later than five years [member]      
Debt [Line Items]      
Non-current portion of non-current borrowings € 4,034 € 2,329  
Later than one year and not later than five years [member] | Forward contract [member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 738 113  
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 580 596  
Non-current portion of non-current borrowings 580 596  
Later than one year and not later than five years [member] | Bank borrowings [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 202 3  
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 18    
Later than one year and not later than five years [member] | US Dollar [Member] | Bonds [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 255 122  
Later than one year and not later than five years [member] | Euro [Member] | Bonds [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 2,242 1,494  
Later than five years [member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 2,439 3,376  
Later than five years [member] | Lease liabilities [member]      
Debt [Line Items]      
Long-term debt including current portion of long-term debt 383 352  
Non-current portion of non-current borrowings 383 352  
Later than five years [member] | Bank borrowings [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings   200  
Later than five years [member] | Other long-term debt [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 8    
Later than five years [member] | US Dollar [Member] | Bonds [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 1,058 1,088  
Later than five years [member] | Euro [Member] | Bonds [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 991 1,735  
Later than one year [member] | Lease liabilities [member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 963 948  
Later than one year [member] | US Dollar [Member] | Bonds [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings   1,210  
Later than one year [member] | Euro [Member] | Bonds [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings € 3,233 € 3,229  
[1] Non-IFRS financial measure. For the definition and reconciliation of the most directly comparable IFRS measure, refer to Reconciliation of non-IFRS information.