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Income from operations - Text Details (Detail)
€ in Millions
12 Months Ended
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
EUR (€)
Income from operations [Line Items]      
Income from government grants € 104 € 98 € 87
Income from subleasing right-of-use assets 293 € 325 307
Transaction price allocated to remaining performance obligations 14,305    
Percentage of remaining performance obligations within 1 year   50.00%  
Employee benefits expense 6,246 € 6,289 6,097
Change in Fair value on contingent consideration (78) (93)  
Gain (loss) recognized as a result of remeasuring to fair value equity interest in associate upon loss of significant influence € 33    
Other environment related provision [member] | EPD Solutions Ltd [Member]      
Income from operations [Line Items]      
Change in fair value of contingent consideration 67,000,000    
Provisions for contingent considerations [Member] | EPD Solutions Ltd [Member]      
Income from operations [Line Items]      
Change in Fair value on contingent consideration € 67 101  
Provisions for contingent considerations [Member] | EPD Solutions Ltd [Member] | Forecasts revision [Member]      
Income from operations [Line Items]      
Change in fair value of contingent consideration 41,000,000    
Change in Fair value on contingent consideration € 41    
Provisions for contingent considerations [Member] | EPD Solutions Ltd [Member] | Milestone [member]      
Income from operations [Line Items]      
Change in fair value of contingent consideration 26,000,000    
Change in Fair value on contingent consideration € 26    
Share-based compensation expenses [Member]      
Income from operations [Line Items]      
Employee benefits expense € 115 € 119 € 103
Not later than one year [member]      
Income from operations [Line Items]      
Explanation of when entity expects to recognise transaction price allocated to remaining performance obligations as revenue   1 year  
Later than one year [member]      
Income from operations [Line Items]      
Explanation of when entity expects to recognise transaction price allocated to remaining performance obligations as revenue   1 year