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Use of estimates and critical accounting judgements - Allowances (Details) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Use of Estimates and Critical Accounting Judgements [Line Items]        
Inventories € 2,242 € 2,936    
Financial assets 14,829 12,381    
Other provisions 1,532 1,209    
Level 3 | Fair value        
Disclosure of Use of Estimates and Critical Accounting Judgements [Line Items]        
Financial assets € 727 € 746    
Percentage of total financial assets 7.00% 9.00%    
Accumulated impairment        
Disclosure of Use of Estimates and Critical Accounting Judgements [Line Items]        
Inventories € 480 € 505 € 521 € 432