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Income from operations - Disaggregation of Sales per geographical cluster (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income from operations [Line Items]      
Revenue from contracts with customers € 19,073 € 19,003 € 17,700
Revenue From Other Sources [1] 462 479 421
Revenue 19,535 19,482 18,121
Western Europe [member]      
Income from operations [Line Items]      
Revenue from contracts with customers 4,594 4,096  
Revenue From Other Sources 19 38  
Revenue 4,613 4,134 3,990
North America [member]      
Income from operations [Line Items]      
Revenue from contracts with customers 6,853 6,837  
Revenue From Other Sources 95 114  
Revenue 6,949 6,951 6,338
Other Mature Geographies [member]      
Income from operations [Line Items]      
Revenue from contracts with customers 1,518 1,583  
Revenue From Other Sources 342 322  
Revenue 1,860 1,905 1,892
Total Mature Geographies [member]      
Income from operations [Line Items]      
Revenue from contracts with customers 12,965 12,515  
Revenue From Other Sources 457 474  
Revenue 13,422 12,990 12,221
Growth Geographies [member]      
Income from operations [Line Items]      
Revenue from contracts with customers 6,108 6,488  
Revenue From Other Sources 5 5  
Revenue 6,113 6,492 € 5,901
Goods or services transferred at point in time [member]      
Income from operations [Line Items]      
Revenue from contracts with customers 14,793 14,982  
Goods or services transferred at point in time [member] | Western Europe [member]      
Income from operations [Line Items]      
Revenue from contracts with customers 3,663 3,165  
Goods or services transferred at point in time [member] | North America [member]      
Income from operations [Line Items]      
Revenue from contracts with customers 4,712 4,944  
Goods or services transferred at point in time [member] | Other Mature Geographies [member]      
Income from operations [Line Items]      
Revenue from contracts with customers 1,145 1,226  
Goods or services transferred at point in time [member] | Total Mature Geographies [member]      
Income from operations [Line Items]      
Revenue from contracts with customers 9,520 9,335  
Goods or services transferred at point in time [member] | Growth Geographies [member]      
Income from operations [Line Items]      
Revenue from contracts with customers 5,273 5,647  
Goods or services transferred over time [member]      
Income from operations [Line Items]      
Revenue from contracts with customers 4,279 4,021  
Goods or services transferred over time [member] | Western Europe [member]      
Income from operations [Line Items]      
Revenue from contracts with customers 931 931  
Goods or services transferred over time [member] | North America [member]      
Income from operations [Line Items]      
Revenue from contracts with customers 2,140 1,894  
Goods or services transferred over time [member] | Other Mature Geographies [member]      
Income from operations [Line Items]      
Revenue from contracts with customers 373 357  
Goods or services transferred over time [member] | Total Mature Geographies [member]      
Income from operations [Line Items]      
Revenue from contracts with customers 3,444 3,181  
Goods or services transferred over time [member] | Growth Geographies [member]      
Income from operations [Line Items]      
Revenue from contracts with customers € 835 € 840  
[1] Other sources mainly relates to leases, including sublease income from right-of-use assets and related services of EUR 325 million (2019: EUR 307 million)