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Debt - Lease liabilities (Detail) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt [Line Items]    
Gross lease liabilities € 1,325 [1],[2] € 1,533
Long-term debt including current portion of long-term debt 6,857 5,355
Interest payable 52 38
Lease liabilities [member]    
Debt [Line Items]    
Long-term debt including current portion of long-term debt 1,216 1,381
Interest payable 109 152
Not later than one year [member]    
Debt [Line Items]    
Gross lease liabilities 290 [1],[2] 292
Not later than one year [member] | Lease liabilities [member]    
Debt [Line Items]    
Current interest payable 23 20
Long-term debt including current portion of long-term debt 267 272
Later than one year and not later than five years [member]    
Debt [Line Items]    
Gross lease liabilities 651 698
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 interest payable 55 80
Later than five years [member]    
Debt [Line Items]    
Gross lease liabilities 384 [1],[2] 543
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 interest payable € 31 € 52
[1] Amounts in this table are undiscounted
[2] This table excludes post-employment benefit plan contribution commitments and income tax liabilities in respect of tax risks because it is not possible to make a reasonably reliable estimate of the actual period of cash settlement.