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Treasury risk management - Summary of Derivatives Used to Hedge (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about hedges [line items]    
Current financial assets € 5,769 € 7,232
Non-current financial assets 1,198 876
Trade payables and other liabilities (15,136) (14,367)
Current financial liabilities (7,252) (4,461)
Non-current financial liabilities (22,881) (22,844)
Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivable 161 78
Current financial assets 76 59
Non-current financial assets 52 21
Total assets 289 158
Trade payables and other liabilities (51) (103)
Current financial liabilities (85) (58)
Non-current financial liabilities (99) (257)
Total liabilities (235) (418)
Total 54 (260)
Fair value hedges | Foreign exchange derivatives | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivable 0 0
Trade payables and other liabilities 0 0
Total 0 0
Fair value hedges | Interest rate derivatives | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Current financial assets 0 0
Non-current financial assets 0 0
Non-current financial liabilities (39) (10)
Total (39) (10)
Cash flow hedges | Foreign exchange derivatives | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivable 100 24
Trade payables and other liabilities (33) (74)
Current financial liabilities 0 0
Total 67 (50)
Cash flow hedges | Interest rate derivatives | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivable 0 0
Current financial assets 11 5
Non-current financial assets 52 21
Trade payables and other liabilities 0 0
Current financial liabilities (24) 0
Non-current financial liabilities (58) (247)
Total (19) (221)
Cash flow hedges | Commodity contracts | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivable 45 40
Trade payables and other liabilities (1) (3)
Current financial liabilities 0 0
Total 44 37
Hedges on the net investment in foreign operations | Foreign exchange derivatives | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivable 0 0
Current financial assets 112 0
Non-current financial assets 0 0
Trade payables and other liabilities 0 0
Current financial liabilities 0 (149)
Total 112 (149)
Hedge accounting not applied | Foreign exchange derivatives | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivable 16 14
Current financial assets (47) 54
Non-current financial assets 0 0
Trade payables and other liabilities (17) (26)
Current financial liabilities (61) 91
Non-current financial liabilities (2) 0
Total (111) 133
Hedge accounting not applied | Commodity contracts | Derivative used to hedge    
Disclosure of detailed information about hedges [line items]    
Trade and other receivable 0
Current financial assets 0
Non-current financial assets 0
Trade payables and other liabilities 0
Current financial liabilities 0
Non-current financial liabilities 0
Total € 0