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Treasury risk management - Narrative (Details)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Disclosure Of Treasury Risk Management [Line Items]          
Future minimum sublease payments expected to be received € 42 € 53      
Commodity derivatives 576 570      
Cumulative gain (loss) (197) (153)      
Adjustment basis to inventory purchased 42        
Retranslation impact from net investment in group companies 2,370 2,363      
Finance income/(cost) € (493) € (354) € (505)    
Revolving Credit Facility          
Disclosure Of Treasury Risk Management [Line Items]          
Period of undrawn revolving bilateral credit facility (in days) 364 days        
Revolving credit facility € 2,550     $ 5,200 $ 7,965
Bilateral credit facility cancelled € 1,500        
Cash flow hedges          
Disclosure Of Treasury Risk Management [Line Items]          
Nominal amount of hedging instrument 991 1,134      
Hedges on the net investment in foreign operations          
Disclosure Of Treasury Risk Management [Line Items]          
Credit exposure € 23,700 € 23,600      
Commodity price risk          
Disclosure Of Treasury Risk Management [Line Items]          
Percentage of possible increase in risk assumption 10.00%     10.00%  
Percentage of possible decrease in risk assumption 10.00%     10.00%  
Commodity price risk | Adjustment basis to inventory purchased          
Disclosure Of Treasury Risk Management [Line Items]          
Adjustment basis to inventory purchased € (103) 114      
Commodity price risk | Cash flow hedges          
Disclosure Of Treasury Risk Management [Line Items]          
Gain (loss) in cash flow hedge reserve € 58 61      
Currency risk          
Disclosure Of Treasury Risk Management [Line Items]          
Percentage of possible increase in risk assumption 10.00%     10.00%  
Percentage of possible decrease in risk assumption 10.00%     10.00%  
Financial assets and liabilities other than functional currency amount € 315 230      
Percentage of possible increase/decrease in risk assumption 10.00%     10.00%  
Net foreign exchange loss € 32 23      
Net investment in foreign operations 13,000 9,900      
Net Investment in foreign operations in GBP 8,800 5,900      
Currency risk | Cash flow hedges          
Disclosure Of Treasury Risk Management [Line Items]          
Impact on equity - trade-related cash flow hedges 99 113      
Currency risk | Hedges on the net investment in foreign operations          
Disclosure Of Treasury Risk Management [Line Items]          
Net investment hedges nominal value 2,800 3,000      
Impact on equity - net investment hedges € 280 303      
Interest rate risk          
Disclosure Of Treasury Risk Management [Line Items]          
Percentage of possible increase in risk assumption 1.00%     1.00%  
Percentage of possible decrease in risk assumption 1.00%     1.00%  
Finance income/(cost) € 85 € 77      
Average interest rate on short term borrowings 1.20% 0.70%      
Interest rate risk | 2023          
Disclosure Of Treasury Risk Management [Line Items]          
Interest rate fixed on expected financial liability 68.00% 70.00%      
Interest rate risk | 2024          
Disclosure Of Treasury Risk Management [Line Items]          
Interest rate fixed on expected financial liability 59.00%        
Interest rate risk | 2022          
Disclosure Of Treasury Risk Management [Line Items]          
Interest rate fixed on expected financial liability   75.00%      
Interest rate risk | Cash flow hedges          
Disclosure Of Treasury Risk Management [Line Items]          
Credit in equity from derivatives in cash flow hedge € 1 € 3      
Debit in equity from derivatives in cash flow hedge € 1 € 4      
Interest rate risk | Cash flow hedges | Interest rate swap contract          
Disclosure Of Treasury Risk Management [Line Items]          
Nominal amount of hedging instrument | $       2,050 3,300
Interest rate risk | Fair value hedges | Interest rate swap contract          
Disclosure Of Treasury Risk Management [Line Items]          
Nominal amount of hedging instrument 3,606 1,192